This sort of minutiae begs for reality checking.
In the IPv6 spec (RFC 2460), you can see "destination options" occur in TWO
places in an unprotected packet. The first place is the obvious place of
just-before-the-transport-header. The second place is the more subtle
just-before-the-routing-header, which has the semantic of making every node
specified in the routing header process the destination options.
My questions are:
1.) In the routing header case, can those specified nodes change
destination options inside that header between routing header hops?
2.) If #1's answer is "yes", must those options have the "mutable"
bit set in them?
3.) In the just-before-transport case, is there any reason for any
"mutable" options to be in that dest-opts bag?
(The correct answer for the second part (IMHO) is "yes". The correct answer
for the third part (again, IMHO) is "no".)
Clear, precise answers to these questions makes AH for IPv6 implementable.
These answers should also appear in the sucessor spec to RFC 2460 (and
probably 2402 as well, but that's for another list).
Thanks,
Dan
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