tcpdump

Using CDP (Cisco Discovery Protocol) to identify which switch and port you are plugged into:

#tcpdump -nn -v -i eth0 -s 1500 -c 1 'ether[20:2] == 0x2000'

Apache Requests in real time:

#tcpdump -i eth0 -s 1024 -l -A port 80|grep "Host:"

Create pcap file compatible with wireshark

tcpdump -nn -w tcpdump.pcap -s0 *rules*

Pipe remote tcpdump into local wireshark

tcpdump -nn -w - -s0 *rules* | nc -l 9999

nc remote.server.address 9999 | wireshark -k -S -i -

Filtering Packets based up TCP Flags