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[Users] bandwidth limited by distance??

From: MarshallJ_at_switch.aust.com
Date: Tue Jul 09 2002 - 05:44:33 CEST

I have a vpn between FreeS/WAN and a cisco vpn concentrator. The FreeS/WAN
box is in Australia and the Cisco is in USA. We have 2Mbit connection at
each end, and I am seeing a 40kbytes/sec transfer rate through the vpn. I
expected it to be a lot faster than that.

I have a second FreeS/WAN box that's connected to the same cisco
concentrator, and is on a 1.5Mbit connection however the ping time is
lower (260ms vs 340 ms) and I am able to transfer 60kbytes/sec.

My question is: Is the ipsec protocol bandwidth limited by round-trip
time? Both ends were reasonably idle other than the vpn traffic at the
times of the tests, so the only thing I can think of is the distance.

My next question is: How can I get this bandwidth to be closer to the
capacity of the links?

Regards,
Josh Marshall.
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