west:~#
 TZ=GMT export TZ
west:~#
 ipsec spi --clear
west:~#
 ipsec eroute --clear
west:~#
 authkey=0xA9876587658765876587658765876587abcdef01
west:~#
 ipsec spi --af inet --edst 192.1.2.45 --spi 0xA9123456 --proto ah --src 192.1.2.23 --ah hmac-sha1-96 --authkey $authkey
west:~#
 ipsec spi --af inet --edst 192.1.2.45 --spi 0xA9123456 --proto tun --src 192.1.2.23 --dst 192.1.2.45 --ip4
west:~#
 ipsec spigrp inet 192.1.2.45 0xA9123456 tun inet 192.1.2.45 0xA9123456 ah
west:~#
 ipsec tncfg --attach --virtual ipsec0 --physical eth1
west:~#
 ifconfig ipsec0 inet 192.1.2.45 netmask 0xffffff00 broadcast 192.1.2.255 up
west:~#
 ipsec look
west NOW
ipsec0->eth1 mtu=16260(1500)->1500
ah0xa9123456@192.1.2.45 AH_HMAC_SHA1: dir=in  src=192.1.2.23 alen=160 aklen=160 life(c,s,h)= natencap=none natsport=0 natdport=0 refcount=4 ref=3
tun0xa9123456@192.1.2.45 IPIP: dir=in  src=192.1.2.23 life(c,s,h)= natencap=none natsport=0 natdport=0 refcount=4 ref=4
ROUTING TABLE
west:~#
 route add -host 192.0.2.1 gw 192.1.2.23 dev ipsec0