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For a research application we need to use the TCP-MD5 option (RFC 2385). After some research we have finally found that only a few GNU/Linux distributions support the option out of the box. We narrowed it down to FreeBSD and CentOS, both of which require changes to the kernel to use the option.

We need help with:

Is there another OS that we should look at which will make the use of this option easier. If anyone has set these options, could you provide pointers to how it can be done.

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Both FreeBSD and Linux kernel recompilation is easy to do. For FreeBSD see… – Hennes Nov 21 '12 at 17:57
Get yourself Gentoo Linux. Compiling and configuring a kernel is a part of installation process there. You'll learn the system in more depth and tweak it to your needs. – user157378 Nov 21 '12 at 17:58

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