cannot resolv specific server (google.com)

InK[Cl] · 04-28-2009, 01:54 AM

Hello.... this is my very first post in this forum, although I've read it a lot of times.

I have the strangest problem that I don't even understand. From several days ago, I haven't been able to resolv the server google.com, so I cannot make any searches or check my gmail. The strange is that I can see every other server and any other webpage.

I know is a software specific issue, because I don't have that problem using windows on the same machine. The problem is the same wether I use kde4 or gnome.

I'm using Debian Sid, connecting wireless with an intel 3945 chipset (the problem remains on wired connection)

Some more info:

Code:

Manutara:/home/ink# cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.2.1

192.168.2.1 is my wireless router

Any help please?

thank you very much

bhaslinux · 04-28-2009, 03:54 AM

check the output of command

dig www.google.com @192.168.2.1
if this does not give ip , then you have to check if the wireless router is able to respond to DNS requests

this can be checked quickly by editing resolv.conf and adding 4.2.2.6 in the servers
if this resolves the issue then the problem is with your wireless router not responding properly to DNS requests.

john test · 04-28-2009, 08:58 AM

Is this an Avahi issue where Avahi has captured google.com and has appended .local? You could look in /etc/avahi/hosts to see if google is there.
If this were on a Windows box you could do a ipconfig /flushdns and ipconfig /registerdns but I don't know how to flush the dns cache on a Linux box.
The DNS service on the linksys router is ok because the windows box can reach google.com so that would seem to put the onus on the linux box and its dns cache and I'm thinking that has to be avahi.

farslayer · 04-28-2009, 09:12 AM

apttiude update
apttiude install ncsd
/etc/rc.d/init.d/nscd restart

that will flush the DNS cache on Linux, and may possibly resolve your connectivity as well. ncsd is a caching name service daemon.

Avahi.. now theres a service that is completely useless for me.. I don't use it, don't need it, I wish it weren't installed by default on a Debian Desktop install.

InK[Cl] · 04-28-2009, 05:30 PM

thank you for your quick answers... this are my advances in the subject

- Adding 4.2.2.6 to resolv.conf did not solve the problem

- Output of dig

Code:

ink@Manutara:~$ dig www.google.com
;; Truncated, retrying in TCP mode.
;; Connection to 192.168.2.1#53(192.168.2.1) for www.google.com failed: connection refused.

same as the output of nslookup

- My avahi/hosts file is empty (all lines are commented)

- Flushing dns (installing nscd) did not solve the problem

something strange:

Code:

ink@Manutara:~$ ping -c 2 google.com
PING google.com (74.125.19.19) 56(84) bytes of data.
64 bytes from google.com (74.125.19.19): icmp_seq=1 ttl=245 time=169 ms
64 bytes from google.com (74.125.19.19): icmp_seq=2 ttl=245 time=167 ms

the issue is with www.google.com and not with google.com. Using OpenDNS partially solves the problem, but it can't resolv pop.google.com or imap.google.com to download mail.

more ideas??.. what about the connection refused message

InK[Cl] · 04-28-2009, 06:18 PM

I managed to solve the problem. I called my ISP to check the dns servers I was using. They gave me a new dns and now I can resolv www.google.com.

OpenDNS solves the problem. The reason I couldn't resolv imap.google.com is a server side problem, now it has to be replaced for any of the following:

imap.gmail.com
imap.googlemail.com
gmail-imap.l.google.com

thanks to all

farslayer · 04-28-2009, 06:44 PM

Nothing like defective DNS to spoil your day..