Re: Warning: never matched protocol: ah. use extension match instead.

[Jan Engelhardt <jengelh@xxxxxxxxxx>]

On Monday 2008-06-23 15:55, Thomas Jacob wrote:

>Could someone clarify what exactly the warning message in the subject
>(from ip6tables) is supposed to tell me?
>
>It looks like that ip6tables -p ah (or -p in general) would match
>packets that contain an ah header as the last extension header whereas
>-m ah matches packets that contain an ah header at any position, but
>I'm not sure.
>
>The core of the question is this: how does one pass unspecified
>ipsec traffic in ip6tables (the way you could do with -p ah + -p esp in
>iptables)?

AH is never the last header in IPv6 (TCP/etc. follows), hence the warning.
But ESP can be the last one.
(And -p esp won't throw a warning.)
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