[lug] DNS Problems: Is it me, or is it Comcast?

[David Anselmi]

Michael Deck wrote:
> At 11:40 AM 10/4/2004, David Anselmi wrote:
> 
>> Michael Deck wrote:
>> [...]
>>
>> Apparently your home office DNS cache is broken.  Your name server
>> (198.49.126.122) is working fine (as indicated by others' replies).
> 
> 
> David, I'm not sure where the cache is located. Just to explain, my 
> "home office" is a Linux box behind a router behind a cable box. I don't 
> *think* that Linux box is caching DNS but if it is, how would I clear it?

Your DNS cache is the servers that answer requests from clients (e.g., 
your Linux box).  They are listed in /etc/resolv.conf.

Probably the name servers in your resolv.conf are Comcast's (set there 
by DHCP from your router, which gets them by DHCP from Comcast).  Can 
you ping them?  Do they match what Comcast's support page says they 
should be?

You can query them specifically with host or dig.  If they don't answer 
correctly (assuming time for their caches to refresh after any changes 
you've made) you probably have to talk to their admins to find out why.

Dave