North American Network Operators Group
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Re: Mechanisms for a multi-homed host to pick the best router

  • From: Valdis . Kletnieks
  • Date: Thu Sep 18 12:15:17 2008 
On Wed, 17 Sep 2008 22:32:29 EDT, Cayle Spandon said:

> (Problem 2) If there is a topology change after the TCP connection has been
> established, the traffic might follow a sub-optimal path.

Another possibility is that the connection was originally established *during*
a link outage, so the initial part of the connection was done over a sub-optimal
path, and that the topology change puts it back to the normal better path...

A possible *biggger* issue is that "toss the reply packet back where the
original came from" makes traffic-engineering your outbound packets a lot more
challenging - you end up having to play announcement games upstream of your
N routers to engineer your *inbound* traffic so your outbound packets do what
you want.

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