VPN Client for Linux

Does anyone know of a VPN client for Linux that is:
* Compatible with all common VPN methods including those used by Windows
* Can be accessed via CLI, API or some other programatical method to allow for development of a web-based configuration system

I'm trying to create a web console that will allow web users to create a VPN connection into their network from my network. I'm open to any suggestions for a solution (hardware, software, you name it)

Also, I'm using the RH9 distro and it would be ideal if the VPN client is compatible

Many thanks for your help!!!
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dancablamAsked:
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pjedmondCommented:
For linking to the 'standard'  Microsoft PPTP you need:

http://pptpclient.sourceforge.net/

For Linux server platforms, the easiest one to set up is Open VPN:

http://openvpn.net/

IPSEC client is provided by OpenSWAN or FreeSWAN:

http://www.openswan.org/
http://www.freeswan.org/

Source code is available for all the above, and rather than CLI, they are normally configured from a configuration file.

http://www.jacco2.dds.nl/networking/l2tp3rdparty.html

is a useful article on some 3rd party solutions.

HTH:)

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pjedmondCommented:
You may wish to have a look at Webmin, which already provides a web side configuration module for some of the above:

http://www.webmin.com/
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