What about going down to the packet level on both machines? A good
combination of traces and netstats may find the problem.
http://oreilly.linux.com/pub/a/linux/2000/03/03/enterprise/network.html
Marco
----- Original Message -----
From: "Joshua Hirsh" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, November 15, 2000 1:41 PM
Subject: Re: Stale UDP connections to the primary/secondary DNS servers
> > Just so you couldn't say that no one answered you, I came up with a few
> > diagnostic questions/things you might want to try:
>
> Thanks Bob ;)
>
> > 1. Can you perform DNS lookups on the web server?
>
> Yup.
>
> > 2. Does anything show up in the httpd log files?
>
> Not a word. I've been looking very frequently. The only thing that showed
> up in the logs relating to this at all was when the machine ran out of
> file descriptors.
>
> > 3. How about the DNS server log files?
>
> Nothing there either
>
> > 4. Does it leave one "connection" for each DNS lookup or is it more
> > sporadic?
>
> That I can't tell for sure, because I can't tell exactly how many looks
> the machine is attempting to do without sniffing them all first. I would
> assume it to be somewhat more sporadic because of the ratio of hits to the
> webserver/stale dns connections.
>
> > 5. If you run nslookup from the web/mail server (pointed at one DNS or
> > the other), does it leave open udp "connections" also?
>
> nope, none. I had tried this initially to see if it was related to DNS
> resolution on the entire machine, or specific to certain applications.
>
> > 6. Were the xinetd connections also DNS UDP connections?
>
> correct. But i've only ever seen two of such connections originating from
> xinetd.
>
> > 7. Is it just DNS, or something broader affecting all UDP?
>
> Specific to DNS only.
>
> > 8. What's the deal?
>
> I wish I knew. I've tried re-installing apache a few times because I
> thought it might be a culprit.. no luck. Same results even from the apache
> rpm's from redhat.
>
> My initial thought was that it had something to do with glibc, but I could
> find anything conclusive to prove this theory.
>
>
> Thanks for the response,
>
> Joshua Hirsh
> efni CONNECT
> UNIX Systems Administration
> [EMAIL PROTECTED]
> Tel: (705) 474-3364 ext. 2557
> Fax: (705) 472-9202
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>
>
>
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