Linux command to sniff a port in console

gistfile1.txt

#sudo apt-get install tcpflow
sudo tcpflow -i any -C -e port <port>

1. To monitor HTTP traffic including request and response headers and message body:

tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'

1. To monitor HTTP traffic including request and response headers and message body from a particular source:

tcpdump -A -s 0 'src example.com and tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'

1. To monitor HTTP traffic including request and response headers and message body from local host to local host:

tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' -i lo

1. To only include HTTP requests, modify “tcp port 80” to “tcp dst port 80” in above commands
2. Capture TCP packets from local host to local host

tcpdump -i lo

Source: https://sites.google.com/site/jimmyxu101/testing/use-tcpdump-to-monitor-http-traffic