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 4.2.17 IPsec [starter]...

sun# ipsec start
Starting strongSwan 4.2.17 IPsec [starter]...

moon# sleep 2 

moon# ipsec up net-net
initiating IKE_SA net-net[1] to 192.168.0.2
generating IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) ]
sending packet: from 192.168.0.1[500] to 192.168.0.2[500]
received packet: from 192.168.0.2[500] to 192.168.0.1[500]
parsed IKE_SA_INIT response 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) CERTREQ ]
received cert request for "C=CH, O=Linux strongSwan, CN=strongSwan Root CA"
sending cert request for "C=CH, O=Linux strongSwan, CN=strongSwan Root CA"
authentication of 'moon.strongswan.org' (myself) with RSA signature successful
sending end entity cert "C=CH, O=Linux strongSwan, CN=moon.strongswan.org"
establishing CHILD_SA net-net
generating IKE_AUTH request 1 [ IDi CERT CERTREQ IDr AUTH SA TSi TSr ]
sending packet: from 192.168.0.1[500] to 192.168.0.2[500]
received packet: from 192.168.0.2[500] to 192.168.0.1[500]
parsed IKE_AUTH response 1 [ IDr CERT AUTH SA TSi TSr N(AUTH_LFT) ]
received end entity cert "C=CH, O=Linux strongSwan, CN=sun.strongswan.org"
  using certificate "C=CH, O=Linux strongSwan, CN=sun.strongswan.org"
  using trusted ca certificate "C=CH, O=Linux strongSwan, CN=strongSwan Root CA"
checking certificate status of "C=CH, O=Linux strongSwan, CN=sun.strongswan.org"
  fetching crl from 'http://crl.strongswan.org/strongswan.crl' ...
  using trusted certificate "C=CH, O=Linux strongSwan, CN=strongSwan Root CA"
  crl correctly signed by "C=CH, O=Linux strongSwan, CN=strongSwan Root CA"
  crl is valid: until Aug 19 13:47:17 2009
certificate status is good
authentication of 'sun.strongswan.org' with RSA signature successful
scheduling reauthentication in 3409s
maximum IKE_SA lifetime 3589s
IKE_SA net-net[1] established between 192.168.0.1[moon.strongswan.org]...192.168.0.2[sun.strongswan.org]


TEST

moon# ipsec status | grep 'net-net.*INSTALLED' [YES]
     net-net{1}:  INSTALLED, TUNNEL, ESP SPIs: cb3175ab_i cff8f7bc_o

sun# ipsec status | grep 'net.net.*INSTALLED' [YES]
     net-net{1}:  INSTALLED, TUNNEL, ESP SPIs: cff8f7bc_i cb3175ab_o

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=1.04 ms

sun# killall tcpdump

sun# cat /tmp/tcpdump.log | grep 'IP moon.strongswan.org > sun.strongswan.org: ESP' [YES]
16:52:00.704613 IP moon.strongswan.org > sun.strongswan.org: ESP(spi=0xcff8f7bc,seq=0x1), length 148

sun# cat /tmp/tcpdump.log | grep 'IP sun.strongswan.org > moon.strongswan.org: ESP' [YES]
16:52:00.705070 IP sun.strongswan.org > moon.strongswan.org: ESP(spi=0xcb3175ab,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