VPN Pass through

Unanswered Question
Aug 29th, 2010
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I have bought two different devices for Internet Link Load balancing over multiple ISPs, i.e. TP-Link R488T and Linksys RV082,, Currently I am using Cisco 2811 Router and only 1 ISP is connected with it, I have configured this router for Cisco VPN Client users,

Now I want to add another device above of my Cisco Router and want to use it as gateway, i.e. TP-Link R488T router,

TP-Link provides 4 simultaneous different ISP connections, adding this device will provide me more bandwidth alongwith failover.

The device manufacturer says, it is a VPN pass through device,

When I add this device next to my router, I need to change my live ip interface with a private Ip interface which is in TP-Link's local LAN interface IP subnet.

Now, definitely my VPN should not connect, as previously I was using my live IP configured on cisco router in Cisco VPN client configuration, but now this live ip is assigned to Tp-link,

How can I pass through my VPN connections ?

Please advise...




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Federico Coto F... Mon, 08/30/2010 - 07:36
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To allow VPN to pass through you need to permit the ports which are used by the VPN to pass traffic.


If you're referring to IPsec VPN, then you should allow:

UDP 500

ESP (IP protocol 50)

UDP 4500 (maybe)

If you're referring a different VPN (PPTP, L2TP, etc), the ports will vary.



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