bizarre network issue

[Ori Idan]

On Wed, Mar 14, 2012 at 7:51 PM, Tom Daly <tom_d at chebucto.ns.ca> wrote:

> hoping someone will take this on, preferably straight to me so as not to
> bore list :-)
>
> topology:
> - in basement:
> Surfboard cable (Eastlink if it matters) modem
>  four ethernet ports, one of which feeds
> Debian firewall/router box feeding hub on 2nd floor
>
> - 2nd floor
> hub feeding
> Kubuntu box (mine)
> XP box (wife)
> Trendnet wireless router
>
> - 1st floor (or wherever)
> XP netbook
>
> this has worked flawlessly for many years- recent new is modem.  Several
> days after it was here, I can't get out to internet/ TBird email on
> anything (cannot connect, try again says Firefox)
>
> I can (as I am doing right now) ssh from Kubuntu to Debian, telnet to
> Chebucto mail, read/compose mail
> so it feels like my network is working and Ye Internette is right there
>
> from Debian I can ping google.ca by name or IP
> I can't connect to google by name or IP on anything
> so it doesn't feel like DNS issue to me
>
> I can plug netbook directly into cable modem and get out fine
>
> I can plug wireless router directly into cable modem, netbook into router,
> get nothing
>
> I can unplug netbook from router, type in IP of router and get into admin
> pages, make and save changes, log out / log in and my changes are there- so
> wireless is working as well
>
> Eastlink says from their end modem looks golden, and won't touch anything
> further
>
> I've made no other changes to anything since known-good behaviour went
> south
>
> anyone feeling adventurous?
>
>
>
I have a much simple network but did see that sometimes the router (modem)
that actually acts as the DNS does not work. What I did was to add an
external DNS server in /etc/resolv.conf, this solved the problem.
I would be happy to know if someone has a solution to this problem.

-- 
Ori Idan
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