> Routing header works so that the next hop is always written to destination
> address field and the rest of the path to routing header fields.
> 
> Problem with this is that:
>  1) it's impossible to authenticate using AH or the like as the header is
> rewritten all the time

AH has provisions for mutable but predictable data such as the
contents of routing headers.  See rfc2402 Appendix 2.

-Sebastien

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