We have a problem with the network card on a Dell Power Edge R410 with Debian 6 (squeeze). It seems that the network card went into "sleep" mode after some time. If we are connected via ssh to the server, the connection drops after a certain period of inactivity. If we then ping the server, it doesn't answer to the first packets, but after 5-10 seconds it's answering again.
Here are the configuration details:
2.6.32-5-amd64 #1 SMP Wed May 18 23:13:22 UTC 2011 x86_64 GNU/Linux
Broadcom Corporation NetXtreme II BCM5716 Gigabit Ethernet bnx2 v2.6.29-11:26 driver: bnx2 version: 2.0.2 firmware-version: 5.0.11 NCSI 2.0.5 bus-info: 0000:01:00.0
UPDATE: I'm not sure, but maybe not only the network card but the whole server went to sleep mode. I can't see anything in /var/log/messages when it happends, if someone knows haw I can increase the loglevel to see more let me know.