RPC response time


i have a nasty problem with my openSuse 10.2 Server. There is absolutely no cpu load, but the server needs at least 10 seconds to respond to connections.

Ping takes under 1ms.

e.g. ssh: i have to wait 12 seconds for the password prompt
e.g. nfs: times out because of the too high response time

Connections to other servers from that faulty one work flawlessly.

Any ideas would be appreciated.