queer dns access problem

[Bill Tangren]

> Can you ping your DNS server from the broken box?
>
> Kris

Well, it doesn't seem that the firewall is the problem. The firewall is
not recording any traffic coming from the broken server when it tries to
access the outside world. [Though I can ssh into another server in the
enclave if I use its IP number.] I have tried unplugging the working
server, renaming the broken one and using its network port, and DNS still
doesn't work. I am stumped as to why. I need this server, and if I don't
fix it soon, I'm going to have to reinstall the OS. I've even gone so far
as to swap out network cards. No joy. Something must be wrong with the
setup, and I'll be damned if I can figure out what it is.


>
>
> -----Original Message-----
> From: redhat-list-bounces at redhat.com
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Bill Tangren
> Sent: Monday, December 10, 2007 9:01 AM
> To: redhat-list at redhat.com
> Subject: queer dns access problem
>
> I have two servers that are set up in the same way, except that the one
> that is working properly is running RHEL ES 4.6 while the other is
> running
> 4.5. I can't update the latter, because DNS is not working properly.
> Ordinarily I would poke around until I found the problem, and not bother
> y'all, but I'm stumped as to what the problem could be. Except for MAC
> address and IP number, the /etc/hosts, /etc/sysconfig/network,
> /etc/resolv.conf, and /etc/sysconfig/network-scripts/ifcfg-eth0 files
> are
> identical. Neither run a DNS service. Both are on the same subnet. Both
> boxes are running iptables, but turning off iptables doesn't help. I can
> ssh into, and ping the broken box. I can ssh out of that box too, if I
> use
> ip numbers. When I try to do an nslookup on the broken box, all I get
> is:
>
> ;; connection timed out; no servers could be reached.
>
> Could someone give me a few clues as to where to look to diagnose this
> problem?
>

-- 

Bill Tangren
U.S. Naval Observatory

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