[CentOS] Centos 4.3: VPN recommend/ howto anyone?

Hi,

I'm just curious about setting up a new VPN here in the office part of our enterprise, as well as a second in our 75+ node data center co-location facility.

Needing to stomp out the ****dows L2TP node here, just too many side-issues with config.

I'd like it to run the same OS as all of our servers, e.g. Centos 4.3.

Any recommedations on which software/server/client rpm's/targ.gz's to run?

Any pointers at existing of wiki-able HOWTO's under Centos I can check out?

As usual, if it's not been documented yet, i'd sincerely contribute what I can to the process of rendering a complete document for the future use of the community.

-karlski