Writing your own security solution may be more trouble than it's worth. Encryption algorithms are notoriously convoluted, not to mention the complexity of managing the keys. IPsec is more than sufficient, although it has significant interoperability issues. There are implementations that are freely available, or you can purchase one that has been expressly tuned for those platforms. Also beneficial is that Microsoft now ships IPsec with Windows 2000 and XP. (Answered by Dave Juitt.)
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