From: Juha Saarinen [mailto:juha(a)saarinen.org] Sent: Thursday, 25 July 2002 08:55 To: Joe Abley Subject: Re: Banking Problems and MTU [...]

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The worst thing you'd expect in a path throughput constriction from 8M to 128k is surely the loss of a window's worth of data. You'd expect to TCP to wind back to slow start, and you'd expect the in-flight pipeline to drain very rapidly. Performance would certainly be hit, but I don't think I would expect consistently stalled connections.

Dunno if it's relevant, but Jetstart is rate-limited at the RAN, which can be anywhere in NZ (my one is in Glenfield, some 25-30km away, but used to be in Wellington).

To and from the DSLAM, Jetstart users have a full RADSL connection (which incidentally is also rate-limited, to 4Mbps down).

Would this sort of rate-limiting affect the problem?

You should simply see a return to TCP slow start. TCP congestion control is not very sophisticated, but it does sort of work. And it works end to end. The cause of any packet loss in the middle isn't known to it. - Donald Neal ------------------------------------------------------------------------------ "This communication, including any attachments, is confidential. If you are not the intended recipient, you should not read it - please contact me immediately, destroy it, and do not copy or use any part of this communication or disclose anything about it. Thank you." ------------------------------------------------------------------------------ - To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog