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Old 03-15-2008, 03:32 PM   #1
linux_linux
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Linux - Determine number of unique hosts connected to server


Normally; I would use netstat -a | grep <port number>
To see a list or to get a count of how many connections to a particular port. However, I need a bit more granular output so that I can also see the number of UNIQUE hosts connected to that port. Otherwise, the current output I am getting will show multiple connections a host may have; which doesn't give me an accurate 'count' of total UNQIUE hosts connected.

Thanks
 
Old 03-15-2008, 05:21 PM   #2
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The "sort" command
Code:
netstat -v -A inet | sed -n  '1,2d;/www-http/p;' | sort -b -k5
tcp        1      0 192.168.1.104:29961     12.120.5.14:www-http    CLOSE_WAIT
tcp        1      0 192.168.1.104:29962     12.120.5.14:www-http    CLOSE_WAIT
tcp        0      0 192.168.1.104:23120     128.242.191.11:www-http ESTABLISHED
tcp        0      0 192.168.1.104:4556      128.242.191.58:www-http CLOSE_WAIT
tcp        1      0 192.168.1:bluectrlproxy 209.62.187.18:www-http  CLOSE_WAIT
tcp        0      0 192.168.1.104:5685      feeds.feedburn:www-http ESTABLISHED
tcp        0      0 192.168.1.104:5686      feeds.feedburn:www-http ESTABLISHED
tcp        0      0 192.168.1.104:5687      feeds.feedburn:www-http ESTABLISHED
tcp        0      0 192.168.1.104:ggz       feeds.feedburn:www-http ESTABLISHED
tcp        1      0 192.168.1.104:10934     od-in-f166.goo:www-http CLOSE_WAIT
tcp        1      0 192.168.1.104:10935     od-in-f166.goo:www-http CLOSE_WAIT
tcp        1      0 192.168.1.104:29115     www.linuxquest:www-http CLOSE_WAIT

netstat -v -A inet | sed -n  '1,2d;/www-http/p;' | sort -b -k5 -u
tcp        1      0 192.168.1.104:29961     12.120.5.14:www-http    CLOSE_WAIT
tcp        0      0 192.168.1.104:23120     128.242.191.11:www-http ESTABLISHED
tcp        0      0 192.168.1.104:4556      128.242.191.58:www-http CLOSE_WAIT
tcp        1      0 192.168.1:bluectrlproxy 209.62.187.18:www-http  CLOSE_WAIT
tcp        0      0 192.168.1.104:5685      feeds.feedburn:www-http ESTABLISHED
tcp        1      0 192.168.1.104:10934     od-in-f166.goo:www-http CLOSE_WAIT
tcp        1      0 192.168.1.104:29115     www.linuxquest:www-http CLOSE_WAIT
The fifth entry looked so strange that I added a rule in iptables to drop that IP.
 
Old 03-15-2008, 10:41 PM   #3
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