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count IPv4 connections per IP

Terminal - count IPv4 connections per IP
netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | sed s/::ffff:// | cut -d: -f1 | sort | uniq -c | sort -n
2009-02-15 09:16:16
User: dt
Functions: awk cut netstat sed sort uniq
12
count IPv4 connections per IP

usefull in case of abuser/DoS attacks.

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Terminal - Alternatives

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What others think

The netstat/grep/awk/sed is a bit much. You can cut it down to the following:

netstat -nA inet |awk '/^[ut]/{print $5}'|cut -d: -f1 |sort |uniq -c |sort -n

Better still if you don't mind a little bit more awk:

netstat -nA inet |awk '/^[ut]/{split($5,a,":");print a[1]}'|sort |uniq -c |sort -n
Comment by hso 332 weeks and 1 day ago

FWIW, you'll have to check your netstat syntax on other *nixes != Linux here, since -A inet is Linux specific (as is tcp/udp in $1).

Comment by hso 332 weeks and 1 day ago

Your point of view

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