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Portability is everything. I chose Linux for my server because I like the way Linux handles packages, and most if not all of the packages are available for Linux. Packages alleviate the need for manual compilation and make upgrades easy.
The IPsec Stack used, is based on KAME, which is available for most free UNIX-Operating Systems. You will find that the code is available on 2.6sec (Linux 2.6), FreeBSD and OpenBSD.