Re: GSE

["J. Noel Chiappa" <jnc@ginger.lcs.mit.edu>]

    > From: Iljitsch van Beijnum <iljitsch@muada.com>

    >> Why do you need the full transport layer state? Which the end-host
    >> does have access to, of course - provided you're doing this in the
    >> end-host, and not at some border box

    > You want to switch to another path when the current one becomes
    > available, but there is no easy way to determine when this happens.
    > Reliable transport protocols know whether the other end is still
    > reachable so they can initiate a failover event if this is no longer
    > the case. A box in the middle would have to monitor the session state.

Oh, right. I guess I just assumed that the end-host always had the job of
detecting when the far end had gone unreachable, since it's clearly such a
nightmare for a middle-box to determine that.

(The middle box would have to know every application, to recognize when there
was a problem, since you can have failure modes that don't show up at the
transport level - e.g. a timeout on a reply).

So then you have the choice of either i) the end-host picks a new far-end
address, or ii) it tells the border router to pick a new one.

	Noel