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SubjectRe: [OT] Connection tracking for IPSec
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On Wed, 2003-08-20 at 16:53, Christophe Saout wrote:
> > No... What I'm saying is that normal IP traffic is processed by the
> > firewall. However, if the incoming traffic is protected with IPSec,
> > since I opened up protocols 50 and 51, the IPSec traffic is admitted
> > without passing any remaining firewall filters. The machine in question
> > is an end host (not a router).
>
> Yes, you're right. I just checked. Only the encrypted traffic passes the
> netfilter rules, never the unencrypted data. So if you open the
> protocols 50 and 51, the encrypted data can pass, gets
> encrypted/decrypted and that data can always pass unchecked.
>
> These packets should get reinjected into the netfilter mechanism after
> decryption and should pass the rules before getting encrypted.

Exactly! Now, I dont know how to reinject the IPSec-decrypted packets
back to the netfilter engine. Anyone?

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