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mrog 02-18-2005 03:04 PM

temporary issues resolving names

We're having a DNS issue that only occurs on two Debian computers - a mail server and a desktop unit. After about an hour to two hours, only these two computers cannot resolve names when both computers are on. In total, there are about 12 computers on two networks and the others are using windows and mandrake OSs. The mail server and the desktop unit are on different networks and both use Debian. Both the Debian and Mandrake systems have the 2.6.8 kernel. All the computers use the same DNS server.

There are no error messages or warnings in the logs concerning this on either of the Debian systems.

The desktop's drive was erased yesterday and the issue recurred during the end of the second stage install. So needless to say, nothing else was added, at that time we were just running off the base system. This leads me to think that it would be the mail server but why would it care about a computer that's on a different network and only that one computer?

When the issue occurs, if we turn off the Debian desktop unit, we can then access web pages on the mail server. While the issue is occurring the mail server still provides mail services flawlessly, as well as webmail.

Any thoughts?

Wandering_Dru 02-18-2005 03:21 PM

I would install ethereal on the machines and take a look at what the packets are doing when the problem arises. I would also make sure I can ping the DNS server from the offending machine when the problem arises.

I ran into a similar problem on a network when a badly behaving BSD box was flooding the server with DNS requests. The difference being that ALL DNS queries on the network were slow and most failed until about the 4 try.

Anyway, I think ethereal would definitely help nail down where the problem is.

EDIT: I just remembered a situation where a linux box would suddenly not be able to resolve hosts if the default gateway wasn't set on the box. Probably totally unrelated but it wouldn't hurt to check it.

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