Herbert Xu wrote:

On Thu, May 01, 2008 at 02:59:42PM +0200, Marco Berizzi wrote:

quoted

Yes indeed, this box is in the middle of a very poorly designed
network: it is the default gateway for lan clients, but it is
routing back all traffic to another lan box except for ipsec
traffic.

OK I don't see any rerouting actions in your rule dump.

Is your box SMP

nope, it is an old PII or PIII 

or have you enabled preemption? 

.config is posted here:

http://www.ussg.iu.edu/hypermail/linux/kernel/0804.3/1763.html

CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
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