Nginx setting up >25.000 concurrent connections per second

Bradley Falzon brad at
Fri Oct 7 10:44:39 UTC 2011

On Fri, Oct 7, 2011 at 5:14 PM, atadmin <nginx-forum at> wrote:

> I tested with this flag enable and disables and the result is the same,
> now is disables because was the las test. Iptables is not enabled for
> the test.
Just confirming you actively removed the nf_conntrack modules. My boxes have
logged conntrack rules warnings in syslog, so if you're not seeing them,
then it's probably not your problem anyway.

My box with connection track is still tracking even though my iptables is
[root at bf1 ~]# service iptables stop
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Unloading modules:                               [  OK  ]
[root at bf1 ~]# lsmod | grep nf_conn
nf_conntrack_ipv6      19655  2
nf_conntrack           79643  2 nf_conntrack_ipv6,xt_state
ipv6                  321509  28 ip6t_REJECT,nf_conntrack_ipv6
[root at bf1 ~]# cat /proc/sys/net/netfilter/nf_conntrack_count

My box with connection track removed:
[brad at cache1 ~]$ cat /proc/sys/net/netfilter/nf_conntrack_count
cat: /proc/sys/net/netfilter/nf_conntrack_count: No such file or directory

Connection tracking probably isn't your issue, but for completeness sake,
just confirming.

Bradley Falzon
brad at
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