iptables crashes server?

Moritz Gartenmeister moritz at uplink-verein.ch
Mon Apr 4 10:16:32 CEST 2005

hi all

i'm running linux and iptables 1.3.1 with pom 20050321. i patched the kernel with ipp2p, 
and layer-7 patch.

the server is running as a bridge and is working absolutly fine. after a while (there is no specific 
time limit) the server crashes. the server is no more able to allocate new memory and even swapping 
doesn't help. in this state i am unable to log in, i have to push the power button.

i don't see heavy traffic before a crash and i don't see any flooding. is there a known memory leak 

i checked /proc/sys/net/ipv4/netfilter/ip_conntrack_count this number is in the range of 2'000 - 5'000.
i checked /proc/slabinfo <active_objs> is more or less similiar to ip_conntrack_count, <num_objs> is 
the maximum of ip_contrack_count.
i also was checking /proc/meminfo and there was no steady increase.

/var/log/messages shows no warning.
/var/log/syslog shows nothing
icmp is working.
imap is probably working (someone told me).
http is not working.
pop over ssl is working (sometimes).

does anyone had/have the same experience? or does anyone have some hints for further steps?

hardware: dell poweredge 2560 with 2gybte ram, 2 xenon dual cpus.

i was running the same setup wiht an older kernel 2.6.7/10 without much troubles.


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