[ih] History question -- multi-homing

[Joseph Touch]

> On Sep 11, 2026, at 12:40 PM, John Day <jeanjour at comcast.net> wrote:
> 
>> Destinations are not the issue, sources are.
> 
> Not really.  They are all addressed to the same address, the destination.

They are because when I change interfaces on current hosts, the host’s source address changes. That’s breaks all sorts of things (or requires the gymnastics of MP-TCP, e.g.).

If you recognize that having two paths to the rest of the world means a router, all that mess goes away.

We implemented that when we double-homed hosts throughout DIv7 on both Ethernet and Myrinet - that’s what the 1997 paper describes.

Joe