tcpdump to capture socket data -

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can use tcpdump capture socket data ?. since , @ listener end i'm freqyently getting additional info along send message.

in between client , end listener , 1 edge server , 1 application server running, not sure @ point additional info being added. troubleshoot, tried use tcpdump capture socket data. couln't capture it.

can please tell me, tcpdump not fit capture socket data?. if so, 1 correct 1 this.

note: i'm using centos

tcpdump can capture data base on port following: tcpdump tcp port 23 , host 210.27.48.1 -w temp.pcap

if still can't capture data, can capture data interface ensure tcpdump working: tcpdump -i eth1 -w temp.pcap

ps: if client , server on same machine, need capture lo interface.


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