The points raised about TCP behavior over links which
see a varying RTT, are classic symptoms of the chosen
"bandwidth on demand" allocation strategy. I remember
this effect with IP over X.25. Similar lessons would
apply to narrow-band ISDN channels.
The tx interface builds a queue of excess traffic.
Extra capacity is allocated on a high speed channel.
Queue disappears. SRTT goes down, if low for several
path RTT. RTO becomes low. High speed link deallocated,
path RTT now higher than RTO.
So, is this a problem with the allocation strategy
of TCP?
Gorry Fairhurst
This archive was generated by hypermail 2b29 : Mon Jan 28 2002 - 09:12:29 EST