Educause Security Discussion
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Slow Cisco Vpn performance!
From: Christian Hroux <Christian.Heroux () ETSMTL CA>
Date: Wed, 26 Sep 2007 13:45:56 -0400
We use Cisco VPN concentrator and most employees use the vpn with their own pc at home. This might be a
security risk and also a situation much harder to support but we mitigate de risk by limiting the vpn access to some
port and inspecting traffic with IPS. Some users have reported very slow performance only when using university
resources through the VPN. All the test point out to the cisco vpn client 4.8 we use on windows XP. The only way to
improve speed was to optimize windows XP TCP/IP stack with http://www.speedguide.net/files/TCPOptimizer.exe in the
This doesn`t seem to be MTU related issue since we varied this parameter during test with the user who was
Let me know off line if you had that kind of complaint from user.
Bacc Ing. ÉTS, M. Ing. Poly, étudiant MBA HEC, Ing jr.
Analyste de l'informatique
(Sécurité réseau & Télécom)
Section systèmes, infrastructures et télécommunications
École de Technologie Supérieure
1100 rue Notre-Dame ouest
Tél : 396-8800 (7863)
"Network design is 50 percent technology, 50 percent diplomacy, 50 percent magic"
- Slow Cisco Vpn performance! Christian Hroux (Sep 26)