Hi A13923,

> Today I have installed a nameserver using bind. [...] I tried to identify the problem using tcpdump.

what type of server did you set up - a simple forwarder, or does this DNS server answer local zones, too?
Did you try turning query logging on within the DNS server?

That "." query does seem a bit strange, indeed. How's the "." zone set up in your named.conf? Is is somehow included in other configuration elements (included files, LDAP, ...)? Do "." zone dumps from both name daemons compare?

Maybe I should have asked first... *what* named daemon have you set up, and on which platform?