on  Tue, 15 Jul 1997 17:40:36 -0700, I wrote:


 >You have to get a whole TCP packet across the PPP link and reassemble
 >it before you make any progress.  You might successfully send enough
 >fragments of a TCP successfuly across the link and still get zero
                 ^^^
 >goodput if line noise takes out one fragment from each copy.

Oops: "single TCP segment", if it wasn' clear.

BTW, firewalls can be another case where you end up using multiple
subnets at home, when you have separate links to work and one to ``the Internet''.