wont someone have to have the necessary state in order to reconstitute
the correct sequence number before handing it off to the destination
host?
i very much hate to bring up the possibility, but it might be better
to explicitly label flows and recover necessary forwarding state based
on the label, rather than exploit a series of special cases to cram a
few bits here and there in the original packet
of course managing this state (distributed forwarding cache) is a
pretty severe pain pain in the ass