Printing IP address / filters

["Nick De Cristofaro" <nickdc () link2exchange com>]

I can't seem to figure out how to print the IP address used by the
system through pcap_lookupdev. How could I display the value of
bpf_u_int32 net in a recognizable IP format? Also, is there a way to
apply multiple filters to packets? Such as I want to capture all IP
packets but I want to tell me when it gets a packet on port 23 or port
21 and perhaps sniffer out snmp packet, version and commands sent. I
know I could do filtering expression seperately but not sure if I can
mix and match them?

Thanks
Nick
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