I-D ACTION:draft-ietf-ipsec-new-auth-00.txt

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 Group of the IETF.                                                        

       Title     : IP Authentication Header                                
       Author(s) : S. Kent, R. Atkinson
       Filename  : draft-ietf-ipsec-new-auth-00.txt
       Pages     : 15
       Date      : 03/28/1997

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 when a Security 
Association is established.  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 
transmitter.  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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