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Re: [Users] bandwidth limited by distance??

From: Henry Spencer (henry_at_spsystems.net)
Date: Tue Jul 09 2002 - 07:02:04 CEST

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On Tue, 9 Jul 2002 MarshallJ_at_switch.aust.com wrote:
> My question is: Is the ipsec protocol bandwidth limited by round-trip
> time?

No. Initial negotiation of tunnels involves some round trips, but once
things are set up, there are no round trips involved in IPsec.

MTU problems are a notorious way of mysteriously ruining throughput -- if
packets are often fragmented, and the link is just unreliable enough that
it's common for one fragment per packet to get lost, that can greatly
reduce performance. Try forcing the MTU down (e.g., with the overridemtu
configuration parameter) and seeing if that helps.

Henry Spencer
henry_at_spsystems.net

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