The CIX and the NSFNET regionals - a dilemma

Brian Lloyd brian at
Wed Feb 5 17:50:06 UTC 1992

My comments are based on some tests that I ran a couple of weeks ago.
Latency between Stanford and MIT via the T3 NSFnet was much greater
than an equivalent path via CIX/Alternet (about 50% longer delay via
the NSFnet).  The results were repeatable and consistent.  Throughput
was also lower but I attribute that to the longer latency and limited
TCP window size.

The bottom line was that the performance as seen by a standard
workstation using standard networking tools was better via CIX.  I
suspect that very large windows would push the throughput performance
in favor of the NSFnet but I do not have the tools right now to test

Anybody have a TCP with large windows I can play with?

Brian Lloyd, WB6RQN                                     Lloyd & Associates
Principal and Network Architect                         3420 Sudbury Road
brian at                                         Cameron Park, CA 95682
voice (916) 676-1147 -or- (415) 725-1392

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