netstat - possible reasons for high IP count ??? Post: 302259334

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Special Forums IP Networking netstat - possible reasons for high IP count ??? Post 302259334 by PWSwebmaster on Monday 17th of November 2008 11:19:42 PM

11-18-2008

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netstat - possible reasons for high IP count ???

One of my servers started getting heavily loaded a few weeks ago for a few hours, so I did some studying and wrote a script to use netstat to get the IP addresses connected and the count. I put a new chain in iptables and if an IP is using more than 40 connections, it gets added to that chain which is then flushed every hour just to make sure no legitimate IP is blocked forever. If an IP is connected more than 100 times, it gets added directly to the INPUT chain and therefore is permanent until manually removed.

I'm mainly trying to figure out if those counts are good limits. Can there be legitimate reasons for an IP to be using more than 40 connections at a time? I tested going to a web page with 200 thumbnail images, and even then my IP was only listed a few times.

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LEARN ABOUT SUSE

unconfined

UNCONFINED(8)							     AppArmor							     UNCONFINED(8)

NAME

       aa-unconfined - output a list of processes with tcp or udp ports that do not have AppArmor profiles loaded

SYNOPSIS

       aa-unconfined

DESCRIPTION

       aa-unconfined will use netstat(8) to determine which processes have open network sockets and do not have AppArmor profiles loaded into the
       kernel.

BUGS

       aa-unconfined must be run as root to retrieve the process executable link from the /proc filesystem. This program is susceptible to race
       conditions of several flavours: an unlinked executable will be mishandled; an executable started before a AppArmor profile is loaded will
       not appear in the output, despite running without confinement; a process that dies between the netstat(8) and further checks will be
       mishandled. This program only lists processes using TCP and UDP. In short, this program is unsuitable for forensics use and is provided
       only as an aid to profiling all network-accessible processes in the lab.

       If you find any bugs, please report them to bugzilla at <http://bugzilla.novell.com>.

SEE ALSO

       netstat(8), apparmor(7), apparmor.d(5), change_hat(2), and <http://forge.novell.com/modules/xfmod/project/?apparmor>.

NOVELL
/SUSE							    2008-06-11							     UNCONFINED(8)