Cheap iftop

watch 'netstat -anptu |egrep "^Proto|:80 "'
Shows updated status in a terminal window for connections to port '80' in a human-friendly form. Use 'watch -n1' to update every second, and 'watch -d' to highlight changes between updates. If you wish for status updates on a port other than '80', always remember to put a space afterwards so that ":80" will not match ":8080".
Sample Output
Every 2.0s: netstat -anptu |egrep "^Proto|:80 "                            Wed May 18 11:03:25 2011

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     18418/apache
tcp        0      0 64.xxx.183.xxx:80        213.xxx.243.xxx:21370  SYN_RECV   -
tcp        0      0 64.xxx.183.xxx:80        213.xxx.243.xxx:6465   SYN_RECV   -
tcp        0      0 64.xxx.202.xxx:80        213.xxx.243.xxx:30703  SYN_RECV   -
tcp        0      0 64.xxx.202.xxx:80        64.xxx.202.xxx:39600   TIME_WAIT  -
tcp        0      0 64.xxx.202.xxx:80        64.xxx.202.xxx:39601   TIME_WAIT  -

7
By: Mozai
2011-05-18 15:05:52

1 Alternatives + Submit Alt

What Others Think

nice but won't tell me which vhost the connection went to or to which hosted site. any chance to see this info too?
Ovidiu · 674 weeks and 6 days ago
watch -dn2 'netstat -anptu | egrep "^Proto|:80" | sort' will watch on ports 80 and 8080 and sort output if u have a lot of connections, highliting changes with update interval 2 sec.
ilrandir · 674 weeks and 4 days ago
Ovidiu: When you say vhost, do you mean a protocol thing, like the domain part of the "RCPT TO:" lines of SMTP? In that case, you'll need packet inspection -- you're better off doing a 'tail -f logfile |grep ' instead.
Mozai · 673 weeks and 6 days ago
ilrandir : I already mentioned using other values for "-n" in the comment.
Mozai · 673 weeks and 6 days ago
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pugpuppies95 · 39 weeks and 2 days ago

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