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VPN over 3G issue

Hi Sir,

Had anyone experienced problem with VPN over 3G network?

My customer connects to Internet using their PC with a 3G card installed. When he pings to his corporate VPN gateway, he gets average 400ms round-trip. When he connects to his company using VPN, the performance is very slow whereas web browsing is fast.

Info I gathered from the network admin is as follows:

- User should be using Cisco VPN Client 4.x

- The VPN box is VPN 3080 Concentrator, software version 4.1.Rel

- Dead Peer Detection (DPD) is enabled

Please advise if there's any known issue with VPN over 3G. Also whether there's any parameters to configure to make things work optimally.

Thank you.

B.Rgds,

Lim TS

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