disabling conntrack ...

/dev/rob0 rob0 at gmx.co.uk
Fri Aug 26 15:16:36 CEST 2005


On Friday 2005-August-26 07:20, Kerryn Wood wrote:
> I need to disable connection tracking and, although I've seen an old

Oh my, what a strange need this is! Tell us why you think you need it, 
and we can answer your questions more effectively (likely explaining 
why you are wrong.)

> I *think* I've removed all the connection tracking modules from
> /lib/modules/<kernel version>/kernel/net/ipv4/netfilter/ (I removed
> all ip_conntrack* files).

Ouch. This is a reckless approach to system administration. Do not 
delete files whose purpose you do not understand.

> When I try and start iptables again I get an error from
> iptables-restore. The error message is: "line 57 failed".

The rule on line 57 of your iptables-restore rules (check your OS 
documentation to find out where that file is) depends on connection 
tracking. My crystal ball tells me it's a MASQUERADE rule.

> I'm running FC3, kernel version 2.6.10-1.766 with iptables version
> 1.2.11.

As was suggested already, use the raw table NOTRACK target to bypass 
connection tracking for the traffic you specify.

> Is there a FAQ or information documented on how to do this (that's
> I've missed and will be wholly embarrassed when you point it out)?
> Does anyone have any experience doing this they could share?

Good heavens no! Connection tracking is the jewel in netfilter's crown. 
Why would I want to disable it?
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