Friday, June 3, 2011

TIP: Useful Linux Network Monitoring Commands

Ports that are t=tcp u=udp l=listening p=program n=numeric
$> netstat -tulpn

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN      2005/smbd
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      2442/apache2
tcp        0      0 0.0.0.0:21              0.0.0.0:*               LISTEN      2323/vsftpd


List of open files and program that opens them. This one looks at specific malicious port 667:
$> sudo lsof -i tcp:667

COMMAND   PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
darkstat 1629 nobody    8u  IPv4   6054      0t0  TCP *:667 (LISTEN)

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