pcap filters outgoing packets

Johny Franslay

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04-22-2004, 02:08 AM

I'm writing a packet sniffer that captures all packets EXCEPT the
outgoing packets with libpcap, but I don't know how to set pcap to do
just that. I know you could simply check the source address however my
program acts as a tunnel endpoint that sends packets originated from
many other machines. Can pcap filter outgoing packets from the rest? If
not, is there any other alternatives?

Thanks in advanced.

-Johny

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