use -i <interface name> ex. tcpdump -i eth0 port 4957 -nn -vv etc. man tcpdump for more options. -- Andrei 2010/2/20 Hadi Motamedi <motamedi24 at hotmail.com> > Dear All > I have put tcpdump trace on port 4957 on my CentOS server , as the > following : > #tcpdump port 4957 > I want to obtain the payload data to see what is realy being exchanged > between my CentOS server and the outside network element . Can you please > let me know how I can modify my command ? > Thank you > > > ------------------------------ > Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. Sign up > now. <https://signup.live.com/signup.aspx?id=60969> > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100220/16f2ad26/attachment-0005.html>