Phil's suggestion about link measurements
- To: uunet!sdcsvax.ucsd.edu!tcp-group%uunet.UU.NET@Sdsc.BITnet
- Subject: Phil's suggestion about link measurements
- From: maximo!mo%uunet.UU.NET@Sdsc.BITnet (Mike O'Dell)
- Date: Fri, 1 Apr 88 13:14:41 EST
The scheme is used in the DARPA SURAN system.
Quite a cute idea. SURAN also implements
virtual acknowledgements. The ideas is that if
a packet is going off from A to C, being forwarded
by B, A sends the packet out, but then listens
for it to be repeated by B. When A hears it,
A knows it got there. If if doesn't hear it
after a while, it resends it. If A hears it
repeated, I now knows the round-trip queueing
delay through B, and uses that information
for a congestion control "pacing" scheme.
SURAN also does automatic connectivity acquisition
and dynamic routing. The scheme works quite
well for moderate-sized networks. For larger
networks like the new DARPA packet radio system,
the basic SURAN ideas are overlaid with a
clustering algorithm, providing for cluster routing.
Good stuff that. We should steal more of it
and invent less.....