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I've setup a new Dell Poweredge R410 server with debian squeeze. If the server is idle for a longer time it seems to go to sleep mode. If I ping the server, it doesn't answer for 10-20 seconds and then comes up again. In in /var/log/messages I can see:

Oct 13 12:54:56 localhost kernel: [74420.949520] device eth0 entered promiscuous mode
Oct 13 12:55:49 localhost kernel: [74473.200155] device eth0 left promiscuous mode

There is nothing configured in /etc/acpi that the server should go to sleep mode if there is no activity for a longer time.

Does anyone know what else can cause the issue?

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Could you please post a log snippet? – quanta Oct 12 '11 at 16:03
I updated the question with the last log messages from /var/log/messages – markus Oct 13 '11 at 13:12
Promiscuous mode is what happens when you run tools like wireshark to sniff all network traffic; it has nothing to do with sleeping. – psusi Oct 13 '11 at 15:13
Yes you're right. For further debugging I run tshark on that server. That problem appered arround that time, but no log messages to see. – markus Oct 13 '11 at 15:18
Do you see something with dmesg? – ott-- Oct 14 '11 at 16:59
up vote 0 down vote accepted

The problem was caused by the bnx2 network driver. After upgrading from version 2.0.2 to 2.0.23b the problem is solved.

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