I think the new mac ageing (sometime since 2.6.8.1) may be too
aggressive. Now it updates the table at a much later time, with a
comment in the code that leads me to believe
this is to prevent counting spoofed packets and a DOS.
My problem is that the update occurs after the netfilter hooks which
may do weird things to change the course of the packet so that it
does not get counted.
(in my case, redirecting, queueing to userspace, nonlocally bound
sockets, etc).
For me this causes packets to go spewing out on the wrong interface
when the timer expires.
I used the attached patch to revert back to the old method.
If you are whacking the source address, that seems wrong. The fix for
that would be to copy the original source address somewhere, then
extract it back afterwards.
I think I was leaving the source address, but I was queueing to
userspace, which causes the packet
to "disappear" from the kernel, meaning the update code was just never
reached.
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