Tcpdump Tips & Tricks



Tcpdump Tips & Tricks


Tcpdump Tips & Tricks 


TCPDUMP USAGE




This article gives a few useful tcpdump examples. Tcpdump is a Linux network packet analyser. Using Tcpdump, the system administrator can see packets of data coming in and going out of a Linux system. Tcpdump is a great tool for network based application troubleshooting.

Listening to packets on “eth0″:
# tcpdump -i eth0





Listening for HTTP (port 80) packets only:
# tcpdump port 80


Listening for HTTP packets on “eth0″:
# tcpdump -i eth0 port 80


Listening for packets on all ports and all ethernet devices except SSH (port 22) packets:
# tcpdump not port 22


Listening for packets with a source IP address of “10.1.1.5″:
# tcpdump src 10.1.1.5


Listening for packets that are not SSH (port 22) packets and that have a souce address of “10.1.1.5″:
# tcpdump not port 22 and src 10.1.1.5

Listening for ICMP (ping) packets on all ethernet devices:
# tcpdump icmp

Saving tcpdump output for later analysis:
# tcpdump -w tcpdump.out

Using Tcpdump with input from a file created using the “-w” option (above):
#tcpdump -r tcpdump.out

Using Tcpdump with input from a file created using the “-w” option (above) and filtering for ICMP packets only:
#tcpdump icmp -r tcpdump.out









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