Iptables Tcpdump

sudo tcpdump src 85.234.78.202
sudo tcpdump -n host 85.234.78.202
sudo tcpdump -i eth0 -n host 194.62.125.132 -vv
sudo tcpdump -nn -i eth3 host 10.11.254.216 and host 10.11.1.249
sudo tcpdump -nn -i eth2 -E commsvpn host 10.11.254.216 and host 10.11.1.249
sudo tcpdump -nn -i eth2 host 10.11.254.216 and host 213.122.172.146

sudo tcpdump -i eth1 | grep host-1.1.1.1.comms.uk.net
sudo tcpdump -i eth1 | grep 192.168.17.78
sudo tcpdump -i eth1 | grep webmail

sudo tcpdump -i eth0 src 82.109.100.227
sudo tcpdump -i eth1 port 1801
sudo tcpdump -nn -i eth1 port 1801
sudo tcpdump -i eth1.26 host 172.16.30.10 and net 192.168.0.0/16

Packet Sniffing on Destination Ip Address
(80.74.16.249 is a web server, All ip addresses destined for webserver)
sudo tcpdump -i eth0 -vv dst 80.74.16.249 and port 81

sudo tail -f /var/log/messages
sudo cat /var/log/messages | grep DST=25

sudo ifconfig
ping 10.11.1.253 -I eth3