tcpdump

tcpdump is simple but powerful tool for analyzing network traffic.

1. Start capturing tcpdump -i any -w /tmp/http.log &
2. Do your thing
3. Stop Capturing killall tcpdump
4. Check it out tcpdump -A -r /tmp/http.log | less

Filtering

To make your data easier to view you can scope the traffic tcpdump is capturing to only get what you are interested in. Filter traffic going to a specific port tcpdump dst port $PORT. Filter traffic going to a specific ip tcpdump dst $IP. Filter traffic going to a specific interface tcpdump -i $INTERFACE.