[RISOLTO] Ubuntu 12.04 problema col DNS

[alkasel]

Salve a tutti.
Ho trascorso circa un anno su ubuntu 10.04, dove la connessione mi funzionava perfettamente. Dopo averci fatto del casino, ho installato da capo (cioè non aggiornando ma da cd) ubuntu 12.04 al posto di esso. Inizialmente ero contento perchè la wireless funzionava subito (il mio computer Lenovo B550 spesso ha problemi con la wireless in quanto necessita di driver proprietari...), ma dopo un po' mi sono accorto che molti siti non caricavano. Ad esempio molto spesso altervista e tutti i siti collegati non funzionano, e così altri siti minori (poco importanti), mentre youtube, gmail, google ed ebay ad esempio funzionano sempre.
E' strano, perchè va a periodi del giorno: ieri sera funzionava tutto perfettamente, ora di nuovo non si connette a molti siti ai quali con altri pc e sistemi operativi posso invece connettermi.

Ho poi scoperto che il problema si presenta anche con la LAN, quindi a quanto pare il problema non è legato ai driver wireless come pensavo.
A me era venuta una mezza idea che il problema c'entrasse col DNS, perchè in alcune pagine di errore di google chrome parlava di quello, ma non me ne intendo abbastanza e non so come intervenire. Anche se vado sulla pagina del mio router Netgear DG834G alla voce "diagnostica", alla sotto-voce "Esegui ricerca DNS", c'è, oltre al campo di input accanto a "nome internet", c'è la scritta "Errore del server: 212.216.112.112
62.94.0.41". Non so se vuol dire qualcosa...
Sperando che possiate aiutarmi, vi posto alcuni output che di solito vengono richiesti nelle discussioni riguardanti questo argomento (ne ho guardate molte ma mi sembra che nessuna tratti il mio specifico problema)(mentre vi scrivo sono connesso tramite wireless)

Ah, dimenticavo: la connessione in casa mia è fatta così: tutto parte da un router NETGEAR DG834G; poi da questo partono cavi LAN, uno dei quali raggiunge camera mia, dove c'è un router SitecomA303DA nel quale ho impostato DHCP=off, se non sbaglio, e quindi funge da "ponte", dunque io collegandomi sia LAN che wireless a tale router (ho 2 pc in camera) mi collego direttamente a quello netgear.

Un grazie già da ora a chi vorrà aiutarmi

iwconfig

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alessandro@alessandro-Lenovo-B550:~$ iwconfig
lo        no wireless extensions.
eth2      IEEE 802.11abg  ESSID:"SitecomA303DA"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: 00:0C:F6:A3:03:DA   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
eth0      no wireless extensions.

lspci

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alessandro@alessandro-Lenovo-B550:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 (rev 03)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9 Family) Thermal Subsystem (rev 03)
04:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
07:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)

lspci -nn | grep -i net

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alessandro@alessandro-Lenovo-B550:~$ lspci -nn | grep -i net
04:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
07:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express [14e4:1713] (rev 02)

iwlist ... scan

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alessandro@alessandro-Lenovo-B550:~$ iwlist wlan0 scan
wlan0     Interface doesn't support scanning.
alessandro@alessandro-Lenovo-B550:~$ iwlist lo scan
lo        Interface doesn't support scanning.
alessandro@alessandro-Lenovo-B550:~$ iwlist eth0 scan
eth0      Interface doesn't support scanning.

dmesg | grep eth

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(comando dato mentre il cavo lan era staccato)
alessandro@alessandro-Lenovo-B550:~$ dmesg | grep eth
[    0.337997] i2c-core: driver [aat2870] using legacy suspend method
[    0.337999] i2c-core: driver [aat2870] using legacy resume method
[    2.031615] tg3 0000:07:00.0: eth0: Tigon3 [partno(BCM95906) rev c002] (PCI Express) MAC address 88:ae:1d:21:95:6b
[    2.031620] tg3 0000:07:00.0: eth0: attached PHY is 5906 (10/100Base-TX Ethernet) (WireSpeed[0], EEE[0])
[    2.031624] tg3 0000:07:00.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[0]
[    2.031627] tg3 0000:07:00.0: eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[   16.458673] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   17.204180] eth1: Broadcom BCM4315 802.11 Hybrid Wireless Controller 6.20.155.1 (r326264)
[   17.329884] udevd[415]: renamed network interface eth1 to eth2
[   20.276395] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   20.277565] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   33.896032] eth2: no IPv6 routers present

(comando dato mentre il cavo lan era attaccato, ed era attiva anche la wireless)
alessandro@alessandro-Lenovo-B550:~$ dmesg | grep eth
[    0.337997] i2c-core: driver [aat2870] using legacy suspend method
[    0.337999] i2c-core: driver [aat2870] using legacy resume method
[    2.031615] tg3 0000:07:00.0: eth0: Tigon3 [partno(BCM95906) rev c002] (PCI Express) MAC address 88:ae:1d:21:95:6b
[    2.031620] tg3 0000:07:00.0: eth0: attached PHY is 5906 (10/100Base-TX Ethernet) (WireSpeed[0], EEE[0])
[    2.031624] tg3 0000:07:00.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[0]
[    2.031627] tg3 0000:07:00.0: eth0: dma_rwctrl[76180000] dma_mask[64-bit]
[   16.458673] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   17.204180] eth1: Broadcom BCM4315 802.11 Hybrid Wireless Controller 6.20.155.1 (r326264)
[   17.329884] udevd[415]: renamed network interface eth1 to eth2
[   20.276395] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   20.277565] ADDRCONF(NETDEV_UP): eth0: link is not ready
[   33.896032] eth2: no IPv6 routers present
[ 1043.497248] tg3 0000:07:00.0: eth0: Link is up at 100 Mbps, full duplex
[ 1043.497254] tg3 0000:07:00.0: eth0: Flow control is on for TX and on for RX
[ 1043.497633] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

sudo lshw -C network

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alessandro@alessandro-Lenovo-B550:~$ sudo lshw -C network
[sudo] password for alessandro: 
  *-network               
       description: Wireless interface
       product: BCM4312 802.11b/g LP-PHY
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: eth2
       version: 01
       serial: 00:26:82:7f:51:c6
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=wl0 driverversion=6.20.155.1 (r326264) ip=192.168.0.3 latency=0 multicast=yes wireless=IEEE 802.11abg
       resources: irq:18 memory:f4500000-f4503fff
  *-network
       description: Ethernet interface
       product: NetLink BCM5906M Fast Ethernet PCI Express
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci@0000:07:00.0
       logical name: eth0
       version: 02
       serial: 88:ae:1d:21:95:6b
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.121 duplex=full firmware=sb v3.04 ip=192.168.0.4 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:48 memory:f4600000-f460ffff

lsmod

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alessandro@alessandro-Lenovo-B550:~$ lsmod
Module                  Size  Used by
rfcomm                 38139  0 
bnep                   17830  2 
bluetooth             158479  10 rfcomm,bnep
parport_pc             32114  0 
ppdev                  12849  0 
binfmt_misc            17292  1 
joydev                 17393  0 
snd_hda_codec_conexant    52554  1 
snd_hda_intel          32765  2 
snd_hda_codec         109562  2 snd_hda_codec_conexant,snd_hda_intel
snd_hwdep              13276  1 snd_hda_codec
snd_pcm                80916  2 snd_hda_intel,snd_hda_codec
snd_seq_midi           13132  0 
snd_rawmidi            25424  1 snd_seq_midi
snd_seq_midi_event     14475  1 snd_seq_midi
lib80211_crypt_tkip    17275  0 
snd_seq                51592  2 snd_seq_midi,snd_seq_midi_event
uvcvideo               67203  0 
videodev               86588  1 uvcvideo
wl                   2906597  0 
psmouse                86520  0 
serio_raw              13027  0 
cfg80211              178877  1 wl
snd_timer              28931  2 snd_pcm,snd_seq
ideapad_laptop         17890  0 
snd_seq_device         14172  3 snd_seq_midi,snd_rawmidi,snd_seq
sparse_keymap          13658  1 ideapad_laptop
lib80211               14040  2 lib80211_crypt_tkip,wl
mac_hid                13077  0 
snd                    62218  13 snd_hda_codec_conexant,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
i915                  419361  4 
drm_kms_helper         45466  1 i915
drm                   197641  5 i915,drm_kms_helper
soundcore              14635  1 snd
snd_page_alloc         14108  2 snd_hda_intel,snd_pcm
i2c_algo_bit           13199  1 i915
video                  19068  1 i915
lp                     17455  0 
parport                40930  3 parport_pc,ppdev,lp
usbhid                 41937  0 
hid                    77428  1 usbhid
tg3                   141369  0 

ifconfig eth2

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alessandro@alessandro-Lenovo-B550:~$ sudo ifconfig eth2
eth2      Link encap:Ethernet  IndirizzoHW 00:26:82:7f:51:c6  
          indirizzo inet:192.168.0.3  Bcast:192.168.0.255  Maschera:255.255.255.0
          indirizzo inet6: fe80::226:82ff:fe7f:51c6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8326 errors:0 dropped:0 overruns:0 frame:1460
          TX packets:10440 errors:7 dropped:0 overruns:0 carrier:0
          collisioni:0 txqueuelen:1000 
          Byte RX:4875535 (4.8 MB)  Byte TX:1638272 (1.6 MB)
          Interrupt:18 

[Diabolik62]

posta
sudo ifconfig eth2 up

[alkasel]

Fatto. Semmai, se ha un qualche rilievo, ditemi se i test li devo fare col cavo lan attaccato o no.
Grazie comunque per l'interessamento

[MariusMatutiae]

Io, al posto tuo, mi farei venire qualche sospetto al riguardo del tuo ISP. C'è una utility di Google, namebench, che controlla la qualità del tuo sistema di DNS. Inoltre, c'è una casella che dice "perform censorship check", che fa al caso tuo: mettici la spunta, e fallo girare. Poi dimmi se la tua linea subisce limitazioni da parte del tuo ISP.

[alkasel]

Ciao, e grazie per i suggerimenti! allora, il risultato di namebench si trova qui:

risultato.tar.gz

risultato di namebench

(95.88 KiB) Scaricato 41 volte

.
Riguardo all'ISP...il mio provider è Telecom Italia, ho alice 7Mb...ma non ho idea di come si fa a sapere se pone delle limitazioni. So solo che prima di passare alla 12.04 funzionava benissimo...ogni tanto magari si disconnetteva ma mi vedeva tutte le pagine regolarmente.

Ah, per la cronaca, ho notato anche che non funziona speedtest.net: si interrompe durante il test di download dicendo: "Download test return an error while trying to read the download file".

[MariusMatutiae]

In effetti, il tuo test dice che il tuo DNS non funziona. Per il momento (il chè vuol dire, se spegni e riavvii perdi la correzione che sto per suggerirti), edita come sudo il file /etc/resolv.conf, e mettici dentro solo questo testo:

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nameserver 8.8.4.4
nameserver 8.8.8.8

Ora prova a navigare un po' andando su tutti quei siti che ti creavano probelmi, poi per favore fammi sapere.

[alkasel]

Incredibile! ora funzionano tutti! ho aperto tutti i miei preferiti in 85 schede del browser, e di queste solo 1 non andava ma è un sito che probabilmente non funziona più (http://www.youtube-mp3.org/it, arriva la schermata bianca, mi mostra anche il sorgente come se fosse una pagina normalissima ma di fatto resta bianca, ma non importa, anzi forse è perchè non ho java installato)
grazie! c'è modo ora di rendere questa modifica permanente, visto che nel file c'era scritto di non modificarlo perchè le modifiche verranno sovrascritte?
(grazie ancora!)

[Diabolik62]

se vuoi puoi provare questi

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prepend domain-name-servers 208.67.222.222, 208.67.220.220;

lo aggiungi qui
sudo gedit /etc/dhcp/dhclient.conf
cosi

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# Configuration file for /sbin/dhclient, which is included in Debian's
#	dhcp3-client package.
#
# This is a sample configuration file for dhclient. See dhclient.conf's
#	man page for more information about the syntax of this file
#	and a more comprehensive list of the parameters understood by
#	dhclient.
#
# Normally, if the DHCP server provides reasonable information and does
#	not leave anything out (like the domain name, for example), then
#	few changes must be made to this file, if any.
#

option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;

send host-name "<hostname>";
#send dhcp-client-identifier 1:0:a0:24:ab:fb:9c;
#send dhcp-lease-time 3600;
#supersede domain-name "fugue.com home.vix.com";
#prepend domain-name-servers 127.0.0.1;

prepend domain-name-servers 208.67.222.222, 208.67.220.220;

request subnet-mask, broadcast-address, time-offset, routers,
	domain-name, domain-name-servers, domain-search, host-name,
	netbios-name-servers, netbios-scope, interface-mtu,
	rfc3442-classless-static-routes, ntp-servers;
#require subnet-mask, domain-name-servers;
#timeout 60;
#retry 60;
#reboot 10;
#select-timeout 5;
#initial-interval 2;
#script "/etc/dhcp3/dhclient-script";
#media "-link0 -link1 -link2", "link0 link1";
#reject 192.33.137.209;

#alias {
#  interface "eth0";
#  fixed-address 192.5.5.213;
#  option subnet-mask 255.255.255.255;
#}

#lease {
#  interface "eth0";
#  fixed-address 192.33.137.200;
#  medium "link0 link1";
#  option host-name "andare.swiftmedia.com";
#  option subnet-mask 255.255.255.0;
#  option broadcast-address 192.33.137.255;
#  option routers 192.33.137.250;
#  option domain-name-servers 127.0.0.1;
#  renew 2 2000/1/12 00:00:01;
#  rebind 2 2000/1/12 00:00:01;
#  expire 2 2000/1/12 00:00:01;
#}

e vedi anche quel sito,devi riavviare perchè funzioni

[Diabolik62]

questo è il risultato

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diabolik62@diabolik62-laptop:~$ cd ~/Scaricati/namebench-1.3.1
diabolik62@diabolik62-laptop:~/Scaricati/namebench-1.3.1$ ./namebench.py
- The python-tk (tkinter) library is missing, using the command-line interface.

namebench 1.3.1 - best source (automatic) on 2013-02-11 17:21:24.627966
threads=40/2 queries=250 runs=1 timeout=3.5 health_timeout=3.75 servers=11
------------------------------------------------------------------------------
- Reading Top 2,000 Websites (Alexa): data/alexa-top-2000-domains.txt (0.7MB)
- Reading Cache Latency Test (100% hit): data/cache-hit.txt (0.1MB)
- Reading Cache Latency Test (100% miss): data/cache-miss.txt (0.1MB)
- Reading Cache Latency Test (50% hit, 50% miss): data/cache-mix.txt (0.1MB)
- Reading Mozilla Firefox: /home/diabolik62/.mozilla/firefox/riuug654.default/places.sqlite (10.0MB)
- Generating tests from Mozilla Firefox (3162 records, selecting 250 automatic)
- Selecting 250 out of 1196 sanitized records (random mode).

- Checking query interception status...
- Checking connection quality: 1/3...3/3
- Congestion level is 1.52X (check duration: 60.69ms)
- Applied 1.52X timeout multiplier due to congestion: 0.8 ping, 5.7 health.
- Checking latest sanity reference
- Building initial DNS cache for 4515 nameservers (40 threads)
- Checking nameserver availability (40 threads): 0/4515.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................904............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................1811.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................2722...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................3631...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................4515/4515
- 1890 of 4515 servers are available (duration: 0:03:50.861893)
- Removing secondary nameservers slower than 164.71ms (max=400)
- Running initial health checks on 410 servers (35 threads): 0/410................................................94............................................181................................................275...........................................358.................................410/410
- 403 of 410 tested name servers are healthy
- Making OpenDNS-2 [9.fra] the primary anycast - faster than OpenDNS [3.fra] by 3.91ms
- Making Google Public DNS [74.125] the primary anycast - faster than Google Public DNS-2 [74.125] by 19.12ms
- Making DynGuide [default] the primary anycast - faster than DynGuide-2 [default] by 16.53ms
- Making UltraDNS [udns5tcam] the primary anycast - faster than UltraDNS-2 [udns4tcam] by 42.27ms
- Picking 17 secondary servers to use (8 nearest, 9 fastest)
- Waiting for wildcard cache queries from 22 servers (22 threads): 0/22............22/22
- Waiting 4s for TTL's to decrement.
- Running cache-sharing checks on 22 servers (40 threads): 0/462.......................................................................142...............................................235.............................................................................................419.....................x.x.462/462
- Disabling TelecomItalia Business 81 IT [dns09] - slower replica of TelecomItalia Business 84 IT [dns09] by 0.6ms.
- Disabling TelecomItalia Business 84 IT [dns09] - slower replica of Telecom Italia 77 IT [dns09] by 5.8ms.
- Disabling TelecomItalia Business 85 IT [dns02] - slower replica of TelecomItalia Business 95 IT [dns02] by 8.4ms.
- Disabling TelecomItalia Business 83 IT [dns02] - slower replica of Telecom Italia 70 IT [dns02] by 5.5ms.
- Disabling OpenDNS-2 [9.fra] - slower replica of Localhost IPv4 [seppia3] by 2.2ms.
- Disabling TelecomItalia 78 IT [dns05] - slower replica of TelecomItalia Business 82 IT [dns05] by 23.0ms.
- Disabling TelecomItalia Business 95 IT [dns02] - slower replica of Telecom Italia 70 IT [dns02] by 0.8ms.
- Picking 7 secondary servers to use (3 nearest, 4 fastest)
- Telecom Italia 69 IT [85.38.28.69] appears to be the nearest regional (34.32ms)
- Running final health checks on 11 servers (11 threads): 0/11.......11/11
- All nameservers have warning: www.paypal.com is hijacked: www.paypal.com.akadns.net (likely a false positive)
- All nameservers have warning: www.facebook.com appears incorrect: star.c10r.facebook.com (likely a false positive)

Final list of nameservers considered:
------------------------------------------------------------------------------
85.38.28.77     Telecom Italia 77  36  ms | (excluded: Too many warnings (7), probably broken.)
85.38.28.70     Telecom Italia 70  36  ms | (excluded: Too many warnings (7), probably broken.)
85.38.28.91     Telecom Italia 91  37  ms | www.google.com is hijacked: 173.194.44.50, 173.194.44.51, 173.194.44.52, 173.194.44.48, 173.194.44.49, google.com appears incorrect: 173.194.40.5, 173.194.40.6, 173.194.40.7, 173.194.40.8, 173.194.40.9, 173.194.40.14, 173.194.40.0, 173.194.40.1, 173.194.40.2, 173.194.40.3, 173.194.40.4, NXDOMAIN Hijacking, twitter.com appears incorrect: 199.59.148.10, 199.59.148.82, 199.59.149.230
85.38.28.69     Telecom Italia 69  37  ms | google.com appears incorrect: 173.194.35.37, 173.194.35.38, 173.194.35.39, 173.194.35.40, 173.194.35.41, 173.194.35.46, 173.194.35.32, 173.194.35.33, 173.194.35.34, 173.194.35.35, 173.194.35.36, NXDOMAIN Hijacking, twitter.com appears incorrect: 199.59.148.82, 199.59.150.7, 199.59.148.10, www.google.com is hijacked: 173.194.44.16, 173.194.44.17, 173.194.44.18, 173.194.44.19, 173.194.44.20
85.38.28.75     Telecom Italia 75  38  ms | NXDOMAIN Hijacking, www.google.com is hijacked: 173.194.44.17, 173.194.44.18, 173.194.44.19, 173.194.44.20, 173.194.44.16, twitter.com appears incorrect: 199.59.148.82, 199.59.149.230, 199.59.148.10, google.com appears incorrect: 173.194.35.36, 173.194.35.37, 173.194.35.38, 173.194.35.39, 173.194.35.40, 173.194.35.41, 173.194.35.46, 173.194.35.32, 173.194.35.33, 173.194.35.34, 173.194.35.35
85.38.28.74     TelecomItalia 74 I 44  ms | google.com appears incorrect: 173.194.35.37, 173.194.35.38, 173.194.35.39, 173.194.35.40, 173.194.35.41, 173.194.35.46, 173.194.35.32, 173.194.35.33, 173.194.35.34, 173.194.35.35, 173.194.35.36, NXDOMAIN Hijacking, twitter.com appears incorrect: 199.59.149.230, 199.59.150.7, 199.59.148.82, www.google.com is hijacked: 173.194.35.180, 173.194.35.176, 173.194.35.177, 173.194.35.178, 173.194.35.179
194.20.8.4      BT Italia IT       48  ms | www.google.com is hijacked: 173.194.44.49, 173.194.44.51, 173.194.44.52, 173.194.44.50, 173.194.44.48, twitter.com appears incorrect: 199.59.148.82, 199.59.149.230, 199.59.150.7
127.0.0.1       Localhost IPv4     50  ms | www.google.com is hijacked: 173.194.44.17, 173.194.44.18, 173.194.44.20, 173.194.44.16, 173.194.44.19, twitter.com appears incorrect: 199.59.149.230, 199.59.150.7, 199.59.148.82, Replica of OpenDNS-2 [208.67.222.222]
8.8.8.8         Google Public DNS  51  ms | twitter.com appears incorrect: 199.59.148.10, 199.59.150.7, 199.59.149.230, www.google.com is hijacked: 173.194.44.20, 173.194.44.16, 173.194.44.17, 173.194.44.19, 173.194.44.18
208.67.222.222  OpenDNS-2          61  ms | (excluded: Slower replica of Localhost IPv4 [127.0.0.1])
216.146.35.35   DynGuide           80  ms | www.google.com is hijacked: 173.194.44.48, 173.194.44.49, 173.194.44.52, 173.194.44.51, 173.194.44.50, NXDOMAIN Hijacking, google.com appears incorrect: 173.194.70.113, 173.194.70.100, 173.194.70.138, 173.194.70.139, 173.194.70.101, 173.194.70.102, twitter.com appears incorrect: 199.59.150.39, 199.59.149.230, 199.59.148.82
156.154.70.1    UltraDNS           89  ms | NXDOMAIN Hijacking, google.com appears incorrect: 173.194.70.100, 173.194.70.138, 173.194.70.113, 173.194.70.139, 173.194.70.101, 173.194.70.102, twitter.com appears incorrect: 199.59.149.230, 199.59.150.39, 199.59.148.82, www.google.com is hijacked: 173.194.44.50, 173.194.44.51, 173.194.44.52, 173.194.44.49, 173.194.44.48

- Sending 250 queries to 9 servers: 0/2250......................................................................................................................................................................................................................................................465................................................................................................................................................................................................................................................925..........................................................................................................................................................................................................................................1377................................................................................................................................................................................................................................................1842....................................................................................................................................................................................................................2250/2250
- Error querying UltraDNS [156.154.70.1]: www.wibiya.com.: Timeout
- Error querying UltraDNS [156.154.70.1]: tinypic.com.: Timeout
- Error querying UltraDNS [156.154.70.1]: launchpad.net.: Timeout
- Error querying Google Public DNS [8.8.8.8]: www.ebay.it.: Timeout
- Error querying DynGuide [216.146.35.35]: forum.fedoraonline.it.: Timeout

Fastest individual response (in milliseconds):
----------------------------------------------
TelecomItalia 74 ########################## 34.16896
Telecom Italia 6 ########################## 34.24692
Telecom Italia 9 ########################## 34.46007
Telecom Italia 7 ########################## 34.71589
BT Italia IT     ########################### 35.20012
Google Public DN ################################## 45.00484
Localhost IPv4   ################################## 45.50505
DynGuide         ########################################### 57.10196
UltraDNS         ##################################################### 71.05899

Mean response (in milliseconds):
--------------------------------
TelecomItalia 74 ############### 40.98
Telecom Italia 9 ################ 43.86
Telecom Italia 6 ################# 44.90
Telecom Italia 7 ################# 45.66
Localhost IPv4   ######################### 68.61
BT Italia IT     ######################### 68.76
Google Public DN ########################## 71.18
DynGuide         ############################################## 126.98
UltraDNS         ##################################################### 147.02

Response Distribution Chart URL (200ms):
----------------------------------------
http://chart.apis.google.com/chart?cht=lxy&chs=720x415&chxt=x,y&chg=10,20&chxr=0,0,200|1,0,100&chd=t:0,23,23,24,25,26,29,30,31,33,45,79,275|0,0,27,52,61,67,72,80,84,88,91,95,99|0,29,29,30,31,32,35,36,37,39,41,44,50,55,70,76,92,118|0,0,9,30,38,42,47,53,57,61,65,68,73,76,80,84,88,91|0,23,23,24,25,25,28,31,33,40,49,177|0,0,30,62,72,76,80,84,88,92,96,99|0,36,37,38,38,39,40,41,41,43,44,46,47,50,54,63,82,116|0,0,8,18,26,36,46,52,56,62,67,72,75,79,83,86,90,94|0,18,18,19,20,21,21,22,26,29,31,34,42,56,88,111|0,0,6,25,48,58,62,66,69,73,77,81,85,89,92,96|0,17,18,19,19,20,21,35,68,190|0,0,18,66,80,86,90,93,97,100|0,17,18,19,20,20,26,36,83,223|0,0,36,72,83,87,90,94,98,100|0,17,18,19,19,20,26,36,52,183|0,0,34,70,81,86,90,94,97,100|0,17,18,19,19,20,23,30,38,110|0,0,20,70,82,86,90,94,98,100&chco=ff9900,1a00ff,ff00e6,80ff00,00e6ff,fae30a,BE81F7,9f5734,000000&chxt=x,y,x,y&chxl=2:||Duration+in+ms||3:||%25|&chdl=Localhost+IPv4|DynGuide|Google+Public+DNS|UltraDNS|BT+Italia+IT|Telecom+Italia+69+IT|Telecom+Italia+75+IT|Telecom+Italia+91+IT|TelecomItalia+74+IT

Response Distribution Chart URL (Full):
---------------------------------------
http://chart.apis.google.com/chart?cht=lxy&chs=720x415&chxt=x,y&chg=10,20&chxr=0,0,3500|1,0,100&chd=t:0,1,1,1,1,1,2,2,2,2,3,4,16,16|0,0,27,52,61,67,72,80,84,88,91,95,99,100|0,2,2,2,2,2,2,2,2,2,2,3,3,3,4,4,5,7,10,15,100|0,0,9,30,38,42,47,53,57,61,65,68,73,76,80,84,88,91,95,98,100|0,1,1,1,1,1,2,2,2,2,3,10,100|0,0,30,62,72,76,80,84,88,92,96,99,100|0,2,2,2,2,2,2,2,2,2,3,3,3,3,3,4,5,7,14,100|0,0,8,18,26,36,46,52,56,62,67,72,75,79,83,86,90,94,97,100|0,1,1,1,1,1,1,1,1,2,2,2,2,3,5,6,15,16|0,0,6,25,48,58,62,66,69,73,77,81,85,89,92,96,100,100|0,1,1,1,1,1,1,2,4,11|0,0,18,66,80,86,90,93,97,100|0,1,1,1,1,1,1,2,5,13|0,0,36,72,83,87,90,94,98,100|0,1,1,1,1,1,1,2,3,10|0,0,34,70,81,86,90,94,97,100|0,1,1,1,1,1,1,2,2,6|0,0,20,70,82,86,90,94,98,100&chco=ff9900,1a00ff,ff00e6,80ff00,00e6ff,fae30a,BE81F7,9f5734,000000&chxt=x,y,x,y&chxl=2:||Duration+in+ms||3:||%25|&chdl=Localhost+IPv4|DynGuide|Google+Public+DNS|UltraDNS|BT+Italia+IT|Telecom+Italia+69+IT|Telecom+Italia+75+IT|Telecom+Italia+91+IT|TelecomItalia+74+IT

Recommended configuration (fastest + nearest):
----------------------------------------------
nameserver 85.38.28.74     # TelecomItalia 74 IT  
nameserver 85.38.28.77     # Telecom Italia 77 IT  
nameserver 85.38.28.70     # Telecom Italia 70 IT  



********************************************************************************
In this test, TelecomItalia 74 IT is 67.4%: Faster 
********************************************************************************

[MariusMatutiae]

Si può fare sul tuo pc, ma non ti conviene farlo sul tuo router? Dopotutto, in questa maniera estendi la cortesia (per così dire) a tutti i membri della tua famiglia...

Se apri la pagina Web di configurazione del tuo router, c'è sicuramente lo spazio per introdurre i numeri IP dei tuoi DNS. Il test di Google ti ha già detto che i loro (di Google) server sono i più veloci per te, quindi io ti consiglierei di introdurre questi due valori (8.8.4.4 e 8.8.8.8, facili da ricordare) sul router. Quanto al tuo pc, la configurazione che hai appena fatto sparirà al primo riavvio, quindi puoi lasciare tutto così.

QUalora avessi la curiosità di sapere come si fa per un pc, guarda questa pagina del manuale di Ubuntu, che ti spiega come funziona il comando resolvconf (tutto attaccato), che però devi downloadare, non credo sia installato di default.

Posso chiederti di inserire "RISOLTO" nel titolo, quando hai fatto, e di modificarlo in qualcosa del tipo "problema col DNS"? In questa maniera, la tua soluzione potrà essere di aiuto anche ad altri. Grazie.

[Diabolik62]

la puo aggiungere qui e non sparisce
sudo gedit /etc/dhcp/dhclient.conf
e aggiunge ,questo
prepend domain-name-servers 8.8.8.8, 8.8.4.4;
sto provando se sono più veloci i dns di google o quelli di OpenDNS

[Diabolik62]

qui il test con dns google è andato male

Codice: Seleziona tutto

diabolik62@diabolik62-laptop:~$ cd ~/Scaricati/namebench-1.3.1
diabolik62@diabolik62-laptop:~/Scaricati/namebench-1.3.1$ ./namebench.py- The python-tk (tkinter) library is missing, using the command-line interface.

namebench 1.3.1 - best source (automatic) on 2013-02-11 17:37:36.927033
threads=40/2 queries=250 runs=1 timeout=3.5 health_timeout=3.75 servers=11
------------------------------------------------------------------------------
- Reading Top 2,000 Websites (Alexa): data/alexa-top-2000-domains.txt (0.7MB)
- Reading Cache Latency Test (100% hit): data/cache-hit.txt (0.1MB)
- Reading Cache Latency Test (100% miss): data/cache-miss.txt (0.1MB)
- Reading Cache Latency Test (50% hit, 50% miss): data/cache-mix.txt (0.1MB)
- Reading Mozilla Firefox: /home/diabolik62/.mozilla/firefox/riuug654.default/places.sqlite (10.0MB)
- Generating tests from Mozilla Firefox (3174 records, selecting 250 automatic)
- Selecting 250 out of 1204 sanitized records (random mode).

- Checking query interception status...
- Checking connection quality: 1/3...3/3
- Congestion level is 1.52X (check duration: 60.75ms)
- Applied 1.52X timeout multiplier due to congestion: 0.8 ping, 5.7 health.
- Checking latest sanity reference
- Building initial DNS cache for 4515 nameservers (40 threads)
- Checking nameserver availability (40 threads): 0/4515...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................915.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................1832..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................2738.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................3645..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................4515/4515
- 1896 of 4515 servers are available (duration: 0:03:49.902940)
- Removing secondary nameservers slower than 166.90ms (max=400)
- Running initial health checks on 410 servers (35 threads): 0/410..............................................90.................................................183................................................274.............................................360...............................410/410
- 402 of 410 tested name servers are healthy
- Making OpenDNS [3.fra] the primary anycast - faster than OpenDNS-2 [9.fra] by 3.49ms
- Making Google Public DNS [74.125] the primary anycast - faster than Google Public DNS-2 [74.125] by 40.49ms
- Making UltraDNS-2 [udns1tcam] the primary anycast - faster than UltraDNS [udns4tcam] by 4.23ms
- Making DynGuide [default] the primary anycast - faster than DynGuide-2 [default] by 36.51ms
- Picking 17 secondary servers to use (8 nearest, 9 fastest)
- Waiting for wildcard cache queries from 22 servers (22 threads): 0/22xxxx............22/22
- Waiting 4s for TTL's to decrement.
- Running cache-sharing checks on 21 servers (40 threads): 0/420.......................................................................................173.............................................262........................................................373......................xx.x.x.420/420
- Disabling Telecom Italia 91 IT [dns06] - slower replica of TelecomItalia Business 71 IT [dns06] by 3.4ms.
- Disabling TelecomItalia Business 83 IT [dns02] - slower replica of TelecomItalia Business 95 IT [dns02] by 1.4ms.
- Disabling Telecom Italia 86 IT [dns04] - slower replica of TelecomItalia Business 89 IT [dns04] by 6.1ms.
- Disabling TelecomItalia 74 IT [dns01] - slower replica of Telecom Italia 73 IT [dns01] by 4.5ms.
- Disabling TelecomItalia Business 81 IT [dns09] - slower replica of TelelecomItalia Business 72 IT [dns09] by 2.0ms.
- Disabling TelecomItalia Business 92 IT [dns03] - slower replica of TelecomItalia Business 80 IT [dns03] by 0.8ms.
- Picking 7 secondary servers to use (3 nearest, 4 fastest)
- TelecomItalia Business 89 IT [85.38.28.89] appears to be the nearest regional (34.34ms)
- Running final health checks on 11 servers (11 threads): 0/11........11/11
- All nameservers have warning: www.paypal.com is hijacked: www.paypal.com.akadns.net (likely a false positive)
- All nameservers have warning: www.facebook.com appears incorrect: star.c10r.facebook.com (likely a false positive)

Final list of nameservers considered:
------------------------------------------------------------------------------
85.38.28.73     Telecom Italia 73  35  ms | (excluded: Too many warnings (7), probably broken.)
85.38.28.95     TelecomItalia Busi 36  ms | NXDOMAIN Hijacking, twitter.com appears incorrect: 199.59.150.7, 199.59.148.10, 199.59.148.82, www.google.com is hijacked: 173.194.44.17, 173.194.44.18, 173.194.44.19, 173.194.44.20, 173.194.44.16, Replica of TelecomItalia Business 83 IT [85.38.28.83]
85.38.28.89     TelecomItalia Busi 37  ms | (excluded: Too many warnings (7), probably broken.)
85.38.28.72     TelelecomItalia Bu 37  ms | (excluded: Too many warnings (7), probably broken.)
85.38.28.90     TelecomItalia Busi 37  ms | NXDOMAIN Hijacking, google.com appears incorrect: 173.194.35.9, 173.194.35.14, 173.194.35.0, 173.194.35.1, 173.194.35.2, 173.194.35.3, 173.194.35.4, 173.194.35.5, 173.194.35.6, 173.194.35.7, 173.194.35.8, www.google.com is hijacked: 173.194.35.148, 173.194.35.144, 173.194.35.145, 173.194.35.146, 173.194.35.147, twitter.com appears incorrect: 199.59.148.10, 199.59.150.7, 199.59.150.39
85.38.28.80     TelecomItalia Busi 40  ms | (excluded: Too many warnings (7), probably broken.)
62.196.2.70     Infracom Network A 42  ms | google.com appears incorrect: 173.194.40.7, 173.194.40.8, 173.194.40.9, 173.194.40.14, 173.194.40.0, 173.194.40.1, 173.194.40.2, 173.194.40.3, 173.194.40.4, 173.194.40.5, 173.194.40.6, twitter.com appears incorrect: 199.59.150.7, 199.59.148.10, 199.59.148.82, www.google.com is hijacked: 173.194.44.50, 173.194.44.51, 173.194.44.52, 173.194.44.48, 173.194.44.49
8.8.8.8         Google Public DNS  52  ms | (excluded: Shares-cache with current primary DNS server)
208.67.220.220  OpenDNS            54  ms | twitter.com appears incorrect: 199.59.148.10, 199.59.150.39, 199.59.148.82, www.google.com is hijacked: 74.125.232.146, 74.125.232.145, 74.125.232.144, 74.125.232.148, 74.125.232.147
127.0.0.1       Localhost IPv4     61  ms | www.google.com is hijacked: 173.194.44.20, 173.194.44.16, 173.194.44.17, 173.194.44.18, 173.194.44.19, Replica of 8.8.8.8, twitter.com appears incorrect: 199.59.148.82, 199.59.150.39, 199.59.150.7
156.154.71.1    UltraDNS-2         78  ms | google.com appears incorrect: 173.194.70.113, 173.194.70.102, 173.194.70.100, 173.194.70.138, 173.194.70.101, 173.194.70.139, NXDOMAIN Hijacking, www.google.com is hijacked: 173.194.44.52, 173.194.44.49, 173.194.44.50, 173.194.44.51, 173.194.44.48, twitter.com appears incorrect: 199.59.148.82, 199.59.149.230, 199.59.148.10
216.146.35.35   DynGuide           116 ms | google.com appears incorrect: 173.194.70.113, 173.194.70.101, 173.194.70.100, 173.194.70.102, 173.194.70.138, 173.194.70.139, NXDOMAIN Hijacking, twitter.com appears incorrect: 199.59.150.39, 199.59.148.10, 199.59.149.230, www.google.com is hijacked: 173.194.44.50, 173.194.44.51, 173.194.44.52, 173.194.44.49, 173.194.44.48

- Sending 250 queries to 7 servers: 0/1750..............................................................................................................................................................................................362.............................................................................................................................................................................................717........................................................................................................................................................................................1069............................................................................................................................................................................................1428..........................................................................................................................................................................1750/1750
- Error querying OpenDNS [208.67.220.220]: www.mariuana.it.: Timeout
- Error querying UltraDNS-2 [156.154.71.1]: www.finanzaonline.com.: Timeout
- Error querying OpenDNS [208.67.220.220]: en.gentoo-wiki.com.: Timeout
- Error querying UltraDNS-2 [156.154.71.1]: www.trovaprezzi.it.: Timeout
- Error querying UltraDNS-2 [156.154.71.1]: www.facebook.com.: Timeout
- Error querying UltraDNS-2 [156.154.71.1]: old.nabble.com.: Timeout
- Error querying OpenDNS [208.67.220.220]: www.ubuntu-linux.it.: Timeout
- Error querying TelecomItalia Business 90 IT [85.38.28.90]: play.google.com.: Timeout

Fastest individual response (in milliseconds):
----------------------------------------------
TelecomItalia Bu ########################## 34.37996
TelecomItalia Bu ########################### 34.52396
Infracom Network ########################### 35.41684
OpenDNS          ################################## 44.29889
Localhost IPv4   ################################## 44.45386
DynGuide         ########################################### 56.41484
UltraDNS-2       ##################################################### 70.36090

Mean response (in milliseconds):
--------------------------------
TelecomItalia Bu ################## 52.90
Localhost IPv4   ################### 58.58
TelecomItalia Bu #################### 59.94
Infracom Network ######################### 75.37
DynGuide         ###################################### 115.53
OpenDNS          ######################################## 123.26
UltraDNS-2       ##################################################### 164.79

Response Distribution Chart URL (200ms):
----------------------------------------
http://chart.apis.google.com/chart?cht=lxy&chs=720x415&chxt=x,y&chg=10,20&chxr=0,0,200|1,0,100&chd=t:0,22,23,24,24,25,26,30,33,39,49,91,256|0,0,8,47,66,74,78,83,88,91,95,98,100|0,28,29,30,30,31,33,36,36,38,44,48,52,60,73,80,97,128|0,0,4,20,34,38,42,53,58,62,66,69,73,76,80,84,88,92|0,22,23,24,24,25,30,30,32,38,97,203|0,0,7,42,56,62,75,81,85,88,92,96|0,35,37,38,39,40,40,41,42,43,43,45,46,47,49,52,55,62,70,80,87,107|0,0,6,16,19,23,29,33,38,44,48,52,56,60,65,70,74,79,82,86,90,94|0,18,18,19,20,21,21,24,29,30,32,38,49,79,100|0,0,8,25,44,54,62,66,70,74,78,82,85,89,92|0,17,18,19,19,20,28,38,67,1750|0,0,28,69,80,85,89,92,96,100|0,17,18,19,19,20,29,39,129|0,0,26,72,83,87,90,94,98&chco=ff9900,1a00ff,ff00e6,80ff00,00e6ff,fae30a,BE81F7&chxt=x,y,x,y&chxl=2:||Duration+in+ms||3:||%25|&chdl=Localhost+IPv4|DynGuide|OpenDNS|UltraDNS-2|Infracom+Network+Application+IT|TelecomItalia+Business+90+IT|TelecomItalia+Business+95+IT

Response Distribution Chart URL (Full):
---------------------------------------
http://chart.apis.google.com/chart?cht=lxy&chs=720x415&chxt=x,y&chg=10,20&chxr=0,0,3500|1,0,100&chd=t:0,1,1,1,1,1,2,2,2,2,3,5,15|0,0,8,47,66,74,78,83,88,91,95,98,100|0,2,2,2,2,2,2,2,2,2,2,3,3,3,4,5,6,7,10,18,22|0,0,4,20,34,38,42,53,58,62,66,69,73,76,80,84,88,92,96,99,100|0,1,1,1,1,1,2,2,2,2,6,12,100|0,0,7,42,56,62,75,81,85,88,92,96,100|0,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,4,4,5,5,6,10,100|0,0,6,16,19,23,29,33,38,44,48,52,56,60,65,70,74,79,82,86,90,94,97,100|0,1,1,1,1,1,1,1,2,2,2,2,3,5,6,9,14,15|0,0,8,25,44,54,62,66,70,74,78,82,85,89,92,96,100,100|0,1,1,1,1,1,2,2,4,100|0,0,28,69,80,85,89,92,96,100|0,1,1,1,1,1,2,2,7,25|0,0,26,72,83,87,90,94,98,100&chco=ff9900,1a00ff,ff00e6,80ff00,00e6ff,fae30a,BE81F7&chxt=x,y,x,y&chxl=2:||Duration+in+ms||3:||%25|&chdl=Localhost+IPv4|DynGuide|OpenDNS|UltraDNS-2|Infracom+Network+Application+IT|TelecomItalia+Business+90+IT|TelecomItalia+Business+95+IT

Recommended configuration (fastest + nearest):
----------------------------------------------
nameserver 85.38.28.95     # TelecomItalia Business 95 IT  
nameserver 85.38.28.73     # Telecom Italia 73 IT  
nameserver 85.38.28.89     # TelecomItalia Business 89 IT  



********************************************************************************
In this test, TelecomItalia Business 95 IT is 10.7%: Faster 
********************************************************************************


- Saving report to /tmp/namebench_2013-02-11_1743.html
- Saving detailed results to /tmp/namebench_2013-02-11_1743.csv
diabolik62@diabolik62-laptop:~/Scaricati/namebench-1.3.1$ 

[alkasel]

Grazie mille! ho modificato le impostazioni del router come mi hai detto tu ed ora, dopo un momento di panico iniziale perchè lì per lì non funzionava niente, ora funziona tutto!
grazie ancora! ci stavo diventando scemo con questo problema!
ciao!

[MariusMatutiae]

Prego, è un piacere.