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TCP-group 1991


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Ax autoroutes



It's clear to me that this is a bug, perhaps in design but more likely
in implementation.  Any autorouter of this kind should immediately
ignore the old route and use the currently-in-use route on a reply to
an incoming connection request.

It is argueable that it should forget and relearn in such a
circumstance.  Perhaps a better trick is to remember two or more routes
in a stack and when initiating an outgoing connection, try them all in
turn, discarding unsuccessful ones.  That would handle varying
propagation, I think.

I've suggested a similar sort of route-unlearning algorithm for revised
net/wrong routing:  when you (as a NR node) hear a nodes broadcast, you
immediately open up an AX.25 link to the station doing the broadcast.
If your link fails for any reason (including retrying-out on
keepalives), you flush that neighbor from the NR routes table, perhaps
taking some number of nodes with it.  There is little overhead with
this technique, just a few one-packet keepalives a couple of times an
hour - perhaps every 15 minutes or so.
        - Brian





Document URL : http://www.a00.de/tcpgroup/1991/msg00133.php
Ralf D. Kloth, Ludwigsburg, DE (QRQ.software). < hostmaster at a00.de > [don't send spam]
Created 2004-12-21. Last modified 2004-12-21. Your visit 2020-10-24 23:31.35. Page created in 0.0369 sec.
 
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