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You can use OpenVPN to create a slim, secure tunnel between two subnets. OpenVPN has several key benefits:
does not require kernel patching
uses a single UDP port for all secured communications
uses OpenSSL cryptographic routines
My specific reaons for using OpenVPN were to easily secure the wireless portion of my home LAN. WEP (Wireless Encryption Protocol) is a good start for securing wireless communications, but it's not enough.
The configuration steps listed below are those I used to achieve my goals. They should be easily modified for other situations (most notably subnet-to-subnet connections across the internet).
Comments on this section should be addressed to its maintainer Scott
Merrill <smerrill at users.sourceforge.net>.