Re: [udlr] Questions

[huitema@bellcore.com (Christian Huitema)]

Steve,

Your suggestion to use "static routing" is indeed the first one that was
considered, is in fact what INRIA plans to use for "simple links". There
are however some very concrete problems with it:

1) point to point packets are sent encrypted with the intended recipient's
key -- that key being the DVB equivalent of a media address, obtained with
the DVB equivalent of ARP. Hiding a small home network behind a single
antenna would require the equivalent of proxy-ARP, that is declaring
all authorized receivers in some central database.

2) radio reception sometimes fades away. If you use stritly static
routing, you end up with a black hole. Individual holes can cure this by
being multi-homed with a satellite plus a normal address. You may imagine
that all the hosts of a small home network are also multi-homed

Multi-homing and proxy ARP scale as 0(N), with N the number of hosts in
the "local network" or "home network". For some value of N, you are better
off doing the right thing, i.e., explicit routing using BGP or RIP, or
DVMRP for MBONE feeds.





-- 
Christian Huitema