The world of IPsec on Linux is a confusing one at the moment. With Kernel 2.6 came a new IPsec kernel stack, combined with 2 userland toolkits (one of which has 3 forks) has lead to mass confusion at the end user level. This paper compares and contrasts the 2 main userland toolkits for the 2.6 stack, as well as differences in the new kernel stack. It will also go into detail into some of the more recent features added into the userland tools, including NAT-Traversal, and talk about current major developments in the IPsec on Linux world.
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