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Re: location of the AH in IPv4

To: touch@ISI.EDU
Subject: Re: location of the AH in IPv4
From: "Perry E. Metzger" <perry@imsi.com>
Date: Fri, 28 Jul 1995 15:16:18 -0400
Cc: ipsec@ans.net
In-Reply-To: Your message of "Fri, 28 Jul 1995 11:23:48 PDT." <199507281824.AA06230@interlock.ans.net>
Reply-To: perry@piermont.com


touch@ISI.EDU writes:
> 		The IPv4 TTL and HDR-CHKSM fields are then only fields
> 		in the IPv4 base header that...
> 
> This confuses base and main header. What is the main header?

IPv6isms creeping back to v4. Think of base header as "IPv4 header"

> I'm presuming the following:
> 
> 	A. AH comes after IPv4 base and after IPv4 options (if any)

In IPv4, AH comes in the payload.

[IPv4 Header][AH [Original payload]]
             ^payload boundary.

Just think of it that way and you are far safer.

Perry

References:

location of the AH in IPv4

From: touch@ISI.EDU

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