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cisco vpn over wireless

By esidirop ·
Hi there,

I have many clients who utilize vpn connectivity over standard dsl or cable internet. There are however some who use wireless however not all of them are succesfull. All my clients on the wireless connections are able to connect and obtain client ip addresses however some of them are unable to utilize any of the vpn capabilities at this point. In short , all clients obtain a client ip. some of the clients have access to both internal web and email, while the others have no access to anything.

The hardware brands used by my clients varies, all however follow at least an 802.11b standard.

To add, those users that are unable to connect to internal resources over vpn, are successfull if they connect via cable to the wireless router directly.

I was wondering if anyone would be able to shed some light on why this is occuring.


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by Joseph Moore In reply to cisco vpn over wireless

I do know that IPSec sometimes does not work through a NAT, and that prevents the VPN tunnel from working. That is a problem that people have when going through a router at home.
The router translates the static IP it has (from the ISP) with the internal private IP ( the computer has. This translation breaks the IPSec encapsulation. I don't know all of the details, but that is what happens.
So, that could be the problem your clients see. If they plug directly into their cable modem, bypassing their routers, then their computer gets a static IP (no NAT), and then the IPSec encapsulation is OK, and VPN works.

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