If your server isn't having a problem, then why not bump up the conntrack number? I've bumped mine up to 2097152. I can't remember where, but I remember reading a pdf article on iptables and how many connections a specific server with X amount of CPU's and X amount of memory can handle. [root@firewall1 ~]# cat /proc/sys/net/ipv4/ip_conntrack_max 2097152 -matt On 6/15/07, Michael Calizo <mike.calizo@xxxxxxxxx> wrote:
Hi Michelson, I have that problem also on one of my FW box. What i did is i created a cronjob that reload the iptables rule. In this case you dont drop any connections and you dont need to reboot your box. So far its working on our production deployed FW. Note: You need to find out how frequent you do this on a weeks. Cheers! On 6/12/07, yossarian1@xxxxxxxxx <yossarian1@xxxxxxxxx> wrote: > Hi, my ip_conntrack table is filling up and now my server is dropping > packets. I'm running CentOS release 4.4 (Final) on a fairly busy > webserver. The table is full of various connections, including a lot > of "ESTABLISHED" tcp connections from my webserver (the src is my > webserver ip), and some other random connections to my webserver, and > many "ASSURED" connections. So why is it filling up? I changed the > default timeout value like so: > > echo 36000 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established > > but I don't think that's had any effect. any thoughts? what additional > info can I provide that would be helpful? I did find a script that > clears out some of the stale connections using hping2, but I don't > know if that's really a great solution to this problem. > > cat /proc/sys/net/ipv4/ip_conntrack_max # 34576 > > after cleaning out the ip_conntrack table using an hping2 script: > cat /proc/net/ip_conntrack | wc -l # 3702 -- this number > was around 34000 before I cleared it out because it was dropping > packets. rebooting the machine, of course, clears it out. > > > I've spent many hours banging my head against the wall trying to > figure this out, reading in google groups and in various forums, to no > avail. My webserver does send out emails to a few thousand > registered users (if they opt it for the email) every day. > > Thank you for your time! I hope I sent this to the right list. This > looked like the right one. Sorry in advance if I made a mistake. > > Michelson > _______________________________________________ > CentOS mailing list > CentOS@xxxxxxxxxx > http://lists.centos.org/mailman/listinfo/centos > -- Mike Calizo Registered Linux User # 365113 _________________________________________________ Even the longest journey has to start with a small first-step _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos
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