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15.1. Support in kernel
15.1.1. Support in vanilla Linux kernel
Currently missing in 2.4, perhaps in 2.5 (see below). There is an issue about keeping the Linux kernel source free of export/import-control-laws regarding encryption code. This is also one case why FreeS/WAN project (IPv4 only IPsec) isn't still contained in vanilla source.
15.1.2. Support in USAGI kernel
The USAGI project has taken over in July 2001 the IPv6 enabled FreeS/WAN code from the IABG / IPv6 Project and included in their kernel extensions, but still work in progress, means that not all IABG features are already working in USAGI extension.