Re: Conntrack helper question

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On Tue, Nov 27, 2012 at 12:03:31PM +1100, Sebastian Zander wrote:
> Hi netfilter devs,
> 
> In current Netfilter is there still a way for a conntrack helper to
> listen to all TCP traffic _independent_ of ports to look for primary
> connections (other than registering with 65535 tuples)? Not that I
> advocate this, I just have some old piece of code that apparently
> did that in ancient 2.6 kernels (ports set to zero in the tuple).

With recent kernels you can attach your helper via -j CT --helper ...
to all ports for some specific layer 4 protocol, eg. TCP.

The ports specified in the registration are simply ignored, we still
keep them there to support for old behaviour for quite some time
though.
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