How to Filter or trace traffic with Tcpdump

Tcpdump is a tool that can be used to examine network traffic on a linux kernel, the below example will filter or check if the interface 1 on the system gets icmp request

tcpdump -nni eth1 icmp

where eth1 can be customized to the interface number
where n tells tcpdump not to convert address e.g host addresses and port numbers to names
where i is the interface on which to listen to.

Further more we can filter or trace the network connection on an interface coming through a specific ip address and port, with the below command

tcpdump -i eth0 host 172.22.0.14 and port 4000
tcpdump -i eth0 host 172.22.0.19 and port 4400 -n -s 0 -vvv -w /usr/src/dump