TCPDUMP

sun# tcpdump -i eth0 not port ssh and not port domain and not arp > /tmp/tcpdump.log 2>&1 &

PRE-TEST

moon# echo 1 > /proc/sys/net/ipv6/conf/all/forwarding

sun# echo 1 > /proc/sys/net/ipv6/conf/all/forwarding

alice# ip route add fec2::/16 via fec1::1

moon# ip route add fec2::/16 via fec0::2 

sun# ip route add fec1::/16 via fec0::1 

bob# ip route add fec1::/16 via fec2::1

moon# ipsec start
Starting strongSwan 4.3.6 IPsec [starter]...

sun# ipsec start
Starting strongSwan 4.3.6 IPsec [starter]...

moon# sleep 2 

moon# ipsec up net-net
002 "net-net" #1: initiating Main Mode
104 "net-net" #1: STATE_MAIN_I1: initiate
003 "net-net" #1: ignoring Vendor ID payload [strongSwan]
003 "net-net" #1: received Vendor ID payload [XAUTH]
003 "net-net" #1: received Vendor ID payload [Dead Peer Detection]
106 "net-net" #1: STATE_MAIN_I2: sent MI2, expecting MR2
002 "net-net" #1: we have a cert and are sending it upon request
108 "net-net" #1: STATE_MAIN_I3: sent MI3, expecting MR3
002 "net-net" #1: Peer ID is ID_FQDN: 'sun.strongswan.org'
002 "net-net" #1: crl not found
002 "net-net" #1: certificate status unknown
002 "net-net" #1: ISAKMP SA established
004 "net-net" #1: STATE_MAIN_I4: ISAKMP SA established
002 "net-net" #2: initiating Quick Mode PUBKEY+ENCRYPT+TUNNEL+PFS+UP {using isakmp#1}
112 "net-net" #2: STATE_QUICK_I1: initiate
002 "net-net" #2: sent QI2, IPsec SA established {ESP=>0x80b7a8b7 <0x4d56f7f0}
004 "net-net" #2: STATE_QUICK_I2: sent QI2, IPsec SA established {ESP=>0x80b7a8b7 <0x4d56f7f0}

moon# sleep 1


TEST

moon# ipsec status | grep 'net-net.*STATE_QUICK_I2.*IPsec SA established' [YES]
000 #2: "net-net" STATE_QUICK_I2 (sent QI2, IPsec SA established); EVENT_SA_REPLACE in 948s; newest IPSEC; eroute owner

sun# ipsec status | grep 'net.net.*STATE_QUICK_R2.*IPsec SA established' [YES]
000 #2: "net-net" STATE_QUICK_R2 (IPsec SA established); EVENT_SA_REPLACE in 1109s; newest IPSEC; eroute owner

alice# ping6 -c 1 -p deadbeef ip6-bob.strongswan.org | grep '64 bytes from ip6-bob.strongswan.org: icmp_seq=1' [YES]
64 bytes from ip6-bob.strongswan.org: icmp_seq=1 ttl=62 time=33.6 ms

sun# killall tcpdump

sun# cat /tmp/tcpdump.log | grep 'IP moon.strongswan.org > sun.strongswan.org: ESP' [YES]
00:59:28.705493 IP moon.strongswan.org > sun.strongswan.org: ESP(spi=0x80b7a8b7,seq=0x1), length 148

sun# cat /tmp/tcpdump.log | grep 'IP sun.strongswan.org > moon.strongswan.org: ESP' [YES]
00:59:28.728053 IP sun.strongswan.org > moon.strongswan.org: ESP(spi=0x4d56f7f0,seq=0x1), length 148


POST-TEST

moon# ipsec stop
Stopping strongSwan IPsec...

sun# ipsec stop
Stopping strongSwan IPsec...

alice# ip route del fec2::/16 via fec1::1

moon# ip route del fec2::/16 via fec0::2 

sun# ip route del fec1::/16 via fec0::1 

bob# ip route del fec1::/16 via fec2::1