Re: New Internet Draft on automatic (end-user) tunneling for SSM

[Ross Finlayson <finlayson@live.com>]

At 05:00 AM 2/23/01, Jeremy Hall wrote:
>Are you making the assumption that
>
>1: the source is reachable from the receiver unicastly
>
>2: somewhere unicast and multicast align
>
>3: unicast and multicast topologies are congruent

The proposal ("UDP tunneling with router interception") does *not* require 
that the unicast and multicast topologies are identical - only that they 
overlap in places.  (The tunneling for each recipient takes place from the 
first upstream router at which they overlap.)

I agree that this doesn't help much for very asymmetrical networks (such as 
satellite downlinks), but fortunately these networks are likely to be 
multicast-enabled anyway.

         Ross.