Re: iptables, ipsec, and host2host

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On Tuesday 2009-02-17 19:33, Joe Pruett wrote:
>> Joe Pruett wrote:
>>> trying this again on the -devel list.  the basic question i'm trying to
>>> answer is if there really isn't a way to filter esp/ah packets after
>>> decryption/decapsulation in host2host mode.  i've looked at what i think
>>> is the current linus kernel and don't see any changes to esp/ah handling
>>> to address this.  is tunnel mode the only way i can do filtering on the
>>> packets after ah/esp have done their work?
>>
>> Packets in both tunnel and transport mode traverse the netfilter hooks
>> after decapsulation and before encapsulation. From a users POV there
>> should be nothing special about it.
>
> i don't see that behaviour on rhel/centos 5 kernels.  could this have changed
> since 2.6.18?  for tunnel mode, it looks to me like the ip-ip module is what
> causes traffic to be seen after decrypt/decap, and i just don't see anything
> like that for transport mode.

ipip is not used for ipsec.
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