Personally I think different filters for different interfaces doesn't
make a lot of sense. I really can't imagine a situation when you'd
need to capture different kinds of packets on different interfaces but
write to a single file.
At least, I think it's fair to say that single filter w/ multiple
interfaces is a more common case then multiple filters & multiple
interfaces. Ideally the more common case shouldn't require you to
specify the same filter twice.
--
Aaron Turner
http://synfin.net/
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows
Those who would give up essential Liberty, to purchase a little temporary
Safety, deserve neither Liberty nor Safety.
-- Benjamin Franklin