Still Having Intermittent Issues Resovling External Domains

[Joel M Nimety]

Hello all -- Just thought I'd give an update on this issue.  We recently 
replaced our Alteon 708 core with a new Riverstone.  After this 
migration our dns problems have been solved.

Specifically two devices were removed from the dns->internet path:

Old:

Crossbeam->alteon180e_external->alteon708->alteon180e_internal->dns_server_farm

New:

Crossbeam->Riverstone->alteon180e_internal->dns_server_farm

We still don't know whether the 180e_external or 708 was causing the 
problem.

Thanks everyone for you help. -- Joel

Joel M Nimety wrote:
> We are still experiencing problems:
> 
>  > We're experiencing intermittent issues resolving domain names.  Often
>  > these domains are microsoft.com, cnn.com, etc.  We are running 3
>  > identical servers and sometime they can go a week or two without any
>  > trouble (othertimes only hours), then without warning one server will
>  > be unable to perform a recursive lookup for a few domains.
>  >
>  > rndc flush has no effect, restarting bind fixes any problems.
> 
> Someone suggested that it may be a firewall issue.  We have contacted
> our fw vendor and made changes to allow all dns traffic through. This
> didn't fix the problem.
> 
> Next, I installed bind 9.3beta4 on one of the machines and forced edns
> size to 512.  About an hour later this box failed.
> 
> We are getting desperate.  I can provide tcpdumps and configs if
> necessary.
> 
> Many thanks to anyone who can help.
> 
> --
> Joel Nimety
> 
> 
> 


-- 
Joel Nimety