tcpdump 간단 사용
-w file
-i interface
-e print the link-level header on each dump line.
tcpdump host x.x.x.x or host x.x.x.x
[root@oracle self]# tcpdump host 112.x.x.x
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
14:55:03.769016 IP 112.x.x.x.58114 > xxx.xxx.net.sunrpc: S 2692676710:2692676710(0) win 5840 <mss 1460,sackOK,timestamp 238192638 0,nop,wscale 6>
14:55:03.774083 IP xxx.xxx.net.sunrpc > 112.x.x.x.58114: R 0:0(0) ack 2692676711 win 0
[byoungguk:월 2월 07 14:51:49 @~]$ telnet x.x.x.x111
Trying x.x.x.x...
telnet: Unable to connect to remote host: Connection refused
[byoungguk:월 2월 07 14:51:58 @~]$
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