libpcap filter syntax

["M. Onur ERGiN" <monurergin () yahoo com>]

hi, 
I am trying to forward some broadcasted packets in the
air. I set the filter as "port 2048", capture the
packet and broadcast it again. I want to do this once
per packet. but since I again send a packet to port
2048, it captures and sends it again and again in an
endless loop. 

anyone having any idea about a better filter? like
"port 2048 and not originated by me(!)"... :)

and is there a way to detect which ethX device is the
wireless one (in a C program)? 

best wishes.
Onur.

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