I-D ACTION:draft-ietf-ipsec-auth-header-07.txt

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	Title		: IP Authentication Header
	Author(s)	: S. Kent, R. Atkinson
	Filename	: draft-ietf-ipsec-auth-header-07.txt
	Pages		: 23
	Date		: 06-Jul-98
	
The IP Authentication Header (AH) is used to provide connectionless
integrity and data origin authentication for IP datagrams (hereafter
referred to as just 'authentication'), and to provide protection
against replays.  This latter, optional service may be selected, by
the receiver, when a Security Association is established. (Although
the default calls for the sender to increment the Sequence Number
used for anti-replay, the service is effective only if the receiver
checks the Sequence Number.)  AH provides authentication for as much
of the IP header as possible, as well as for upper level protocol
data.  However, some IP header fields may change in transit and the
value of these fields, when the packet arrives at the receiver, may
not be predictable by the sender.  The values of such fields cannot
be protected by AH.  Thus the protection provided to the IP header by
AH is somewhat piecemeal.

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