1) Linux 2.6+ contains NETKEY, a native IPsec implementation. 2) NETKEY has also been backported to kernel 2.4. This port is not included with the vanilla Linus kernel but some Linux distributions (Debian in particular) include the backport in their kernels. 3) The ipsec-tools utilities (including the IKE daemon 'racoon') are a Linux port of KAME. Ipsec-tools is included in most distributions. 4)
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