Keeping the site online is challenging, with everyone blocking Ads □. nixCraft is a one-person show, and many of you use Adblocker. □ Was this helpful? Please add a comment to show your appreciation or feedback. Join the nixCraft community via RSS Feed or Email Newsletter. He wrote more than 7k+ posts and helped numerous readers to master IT topics. Vivek Gite is the founder of nixCraft, the oldest running blog about Linux and open source. This simple technique can be used record and debug problems. Tcpdump -X -vv -r /root/port.80.debug.txt Next day you can log into your box and read the /root/port.80.debug.txt file: It will schedule capturing of 30,000 packets and writing raw data to a file called /usr/sbin/tcpdump -n -c 30000 -w /root/port.80.debug.txt Let us say your webserver facing problem everday at midnight. Tcpdump can be used to find out about attacks and other problems. This is useful to see lots of information.Ĭapturing traffic information using cronjobs -s 1500: Snarf snaplen bytes of data from each packet rather than the default of 68.This is very handy for analysing new protocols. -X : hen parsing and printing, in addition to printing the headers of each packet, print the data of each packet (minus its link level header) in hex and ASCII.-x : When parsing and printing, in addition to printing the headers of each packet, print the data of each packet.Tcpdump -i eth1 'port 80' Monitor all traffic on port 25 ( SMTP ) Tcpdump -i eth1 Monitor all traffic on port 80 ( HTTP )
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