east:~#
 TZ=GMT export TZ
east:~#
 ipsec spi --clear
east:~#
 ipsec eroute --clear
east:~#
 enckey=0x4043434545464649494a4a4c4c4f4f515152525454575758
east:~#
 authkey=0x87658765876587658765876587658765
east:~#
 saref=4562
east:~#
 nfsaref=$(printf "%d" $(( ($saref * 65536) | 0x80000000 )))
east:~#
 echo 0xffffffff >/proc/sys/net/ipsec/debug_xform
east:~#
 echo 0xffffffff >/proc/sys/net/ipsec/debug_pfkey
east:~#
 echo 0xffffffff >/proc/sys/net/ipsec/debug_xmit
east:~#
 echo 0xffffffff >/proc/sys/net/ipsec/debug_tunnel
east:~#
 ipsec spi --af inet --edst 192.1.2.45 --spi 0x1bbdd678 --proto esp --src 192.1.2.23 --esp 3des-md5-96 --enckey $enckey --authkey $authkey 
east:~#
 ipsec spi --af inet --edst 192.1.2.45 --spi 0x1bbdd678 --proto tun --src 192.1.2.23 --dst 192.1.2.45 --ip4 --saref $saref
/usr/local/libexec/ipsec/spi: saref=4562/0
east:~#
 ipsec spigrp inet 192.1.2.45 0x1bbdd678 tun inet 192.1.2.45 0x1bbdd678 esp 
east:~#
 ifconfig mast0 inet 192.1.2.23 netmask 255.255.255.255 mtu 1460 up
east:~#
 arp -s 192.1.2.45  10:00:00:64:64:45
east:~#
 arp -s 192.1.2.254 10:00:00:64:64:45
east:~#
 ipsec look
east NOW
esp0x1bbdd678@192.1.2.45 ESP_3DES_HMAC_MD5: dir=out src=192.1.2.23 iv_bits=64bits iv=0xDEADF00DDEADF00D alen=128 aklen=128 eklen=192 life(c,s,h)= natencap=none natsport=0 natdport=0 refcount=3 ref=1 refhim=0 reftable=0 refentry=1
tun0x1bbdd678@192.1.2.45 IPIP: dir=out src=192.1.2.23 life(c,s,h)= natencap=none natsport=0 natdport=0 refcount=3 ref=4562 refhim=0 reftable=2 refentry=466
ROUTING TABLE
east:~#
 ip rule add fwmark 0x80000000 fwmarkmask 0x80000000 table 51
east:~#
 ip route add 0.0.0.0/0 dev mast0 table 51
east:~#
 iptables -I OUTPUT 1 -t mangle --src 192.0.2.254/32 --dst 192.0.1.0/24 -j MARK --set-mark $nfsaref
east:~#
 hping2 -a 192.0.2.254 -c 2 --udp -d 64 -e 'mast0' 192.0.1.254
HPING 192.0.1.254 (eth1 192.0.1.254): udp mode set, 28 headers + 64 data bytes

--- 192.0.1.254 hping statistic ---
2 packets tramitted, 0 packets received, 100% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms