[Ipsec] Minor comment on draft-ietf-ipsec-rfc2402bis-10.txt (AH)

There is a strange sentence in:

3.3.3.1  Handling Mutable Fields
   ...
                          ...  If the IP (v4 or v6) implementation
   encounters an extension header that it does not recognize, it will
   discard the packet and send an ICMP message.  IPsec will never see
   the packet. 
   ...

There is no such thing as "unrecognized extension header". There are
only "recognized extension headers" and "transport protocol". Thus, if
a stack receives a header that it does not recognize as an extension
header, it must assume that it is a transport protocol. This protocol
may have receiver or may not (in Unix receiver may be using the raw
socket). If no receiver, it may result a protocol unreachable ICMP.

However, IPsec will see such packets (and actually have a policy
selector for it). Hence, the two sentences above could/should be
deleted.

Other that above editorial[?] issue(s), the text seem OK by me (same
applies to the ESP draft, which I forgot to state in my previous
comment).

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