Howto configure the Linux kernel / net / xfrm XFRM configuration * Option: XFRM * Kernel Versions: 2.6.15.6 ... bool depends on NET * Option: XFRM_USER * Kernel Versions: 2.6.15.6 ... * (on/off/module) IPsec user configuration interface * depends on INET && XFRM Support for IPsec user configuration interface used by native Linux tools. If unsure, say Y. * Option: NET_KEY * Kernel Versions: 2.6.15.6 ... * (on/off/module) PF_KEY sockets * select XFRM PF_KEYv2 socket family, compatible to KAME ones. They are required if you are going to use IPsec tools ported from KAME. Say Y unless you know what you are doing.