TCPDUMP moon# tcpdump -i eth0 not port ssh and not port domain and not arp > /tmp/tcpdump.log 2>&1 & PRE-TEST alice# /etc/init.d/iptables start 2> /dev/null * Starting firewall ... [ ok ] venus# /etc/init.d/iptables start 2> /dev/null * Starting firewall ... [ ok ] sun# /etc/init.d/iptables start 2> /dev/null * Starting firewall ... [ ok ] moon# echo 1 > /proc/sys/net/ipv4/ip_forward moon# iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -p udp -j SNAT --to-source 192.168.0.1:1024-1100 moon# iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -p tcp -j SNAT --to-source 192.168.0.1:2000-2100 alice# rm /etc/ipsec.d/cacerts/* venus# rm /etc/ipsec.d/cacerts/* sun# rm /etc/ipsec.d/cacerts/* alice# ipsec start Starting strongSwan 4.2.17 IPsec [starter]... venus# ipsec start Starting strongSwan 4.2.17 IPsec [starter]... sun# ipsec start Starting strongSwan 4.2.17 IPsec [starter]... alice# sleep 5 alice# ipsec up nat-t 002 "nat-t" #1: initiating Main Mode 104 "nat-t" #1: STATE_MAIN_I1: initiate 003 "nat-t" #1: ignoring Vendor ID payload [strongSwan 4.2.17] 003 "nat-t" #1: received Vendor ID payload [XAUTH] 003 "nat-t" #1: received Vendor ID payload [Dead Peer Detection] 003 "nat-t" #1: received Vendor ID payload [RFC 3947] 002 "nat-t" #1: enabling possible NAT-traversal with method 3 106 "nat-t" #1: STATE_MAIN_I2: sent MI2, expecting MR2 003 "nat-t" #1: NAT-Traversal: Result using RFC 3947: i am NATed 108 "nat-t" #1: STATE_MAIN_I3: sent MI3, expecting MR3 002 "nat-t" #1: Peer ID is ID_IPV4_ADDR: '192.168.0.2' 002 "nat-t" #1: ISAKMP SA established 004 "nat-t" #1: STATE_MAIN_I4: ISAKMP SA established 002 "nat-t" #2: initiating Quick Mode PSK+ENCRYPT+TUNNEL+PFS+UP {using isakmp#1} 112 "nat-t" #2: STATE_QUICK_I1: initiate 002 "nat-t" #2: sent QI2, IPsec SA established {ESP=>0x298a8b8d <0xc7ac5a19 NATOA=0.0.0.0} 004 "nat-t" #2: STATE_QUICK_I2: sent QI2, IPsec SA established {ESP=>0x298a8b8d <0xc7ac5a19 NATOA=0.0.0.0} venus# sleep 5 venus# ipsec up nat-t 002 "nat-t" #1: initiating Main Mode 104 "nat-t" #1: STATE_MAIN_I1: initiate 003 "nat-t" #1: ignoring Vendor ID payload [strongSwan 4.2.17] 003 "nat-t" #1: received Vendor ID payload [XAUTH] 003 "nat-t" #1: received Vendor ID payload [Dead Peer Detection] 003 "nat-t" #1: received Vendor ID payload [RFC 3947] 002 "nat-t" #1: enabling possible NAT-traversal with method 3 106 "nat-t" #1: STATE_MAIN_I2: sent MI2, expecting MR2 003 "nat-t" #1: NAT-Traversal: Result using RFC 3947: i am NATed 108 "nat-t" #1: STATE_MAIN_I3: sent MI3, expecting MR3 002 "nat-t" #1: Peer ID is ID_IPV4_ADDR: '192.168.0.2' 002 "nat-t" #1: ISAKMP SA established 004 "nat-t" #1: STATE_MAIN_I4: ISAKMP SA established 002 "nat-t" #2: initiating Quick Mode PSK+ENCRYPT+TUNNEL+PFS+UP {using isakmp#1} 112 "nat-t" #2: STATE_QUICK_I1: initiate 002 "nat-t" #2: sent QI2, IPsec SA established {ESP=>0x980f7512 <0x227d232f NATOA=0.0.0.0} 004 "nat-t" #2: STATE_QUICK_I2: sent QI2, IPsec SA established {ESP=>0x980f7512 <0x227d232f NATOA=0.0.0.0} TEST alice# ipsec status | grep 'nat-t.*STATE_QUICK_I2.*IPsec SA established' [YES] 000 #2: "nat-t" STATE_QUICK_I2 (sent QI2, IPsec SA established); EVENT_SA_REPLACE in 863s; newest IPSEC; eroute owner venus# ipsec status | grep 'nat-t.*STATE_QUICK_I2.*IPsec SA established' [YES] 000 #2: "nat-t" STATE_QUICK_I2 (sent QI2, IPsec SA established); EVENT_SA_REPLACE in 932s; newest IPSEC; eroute owner sun# ipsec status | grep 'nat-t.*STATE_QUICK_R2.*IPsec SA established' [YES] 000 #2: "nat-t"[2] 192.168.0.1:1025 STATE_QUICK_R2 (IPsec SA established); EVENT_SA_REPLACE in 1102s; newest IPSEC; eroute owner 000 #4: "nat-t"[4] 192.168.0.1:1026 STATE_QUICK_R2 (IPsec SA established); EVENT_SA_REPLACE in 1109s; newest IPSEC; eroute owner sun# ipsec status | grep 'nat-t.*\[10.1.0.10\]' [YES] 000 "nat-t"[2]: 10.2.0.0/16===192.168.0.2:4500...192.168.0.1:1025[10.1.0.10]===10.1.0.10/32; erouted; eroute owner: #2 sun# ipsec status | grep 'nat-t.*\[10.1.0.20\]' [YES] 000 "nat-t"[4]: 10.2.0.0/16===192.168.0.2:4500...192.168.0.1:1026[10.1.0.20]===10.1.0.20/32; erouted; eroute owner: #4 alice# ping -c 1 10.2.0.10 | grep '64 bytes from 10.2.0.10: icmp_seq=1' [YES] 64 bytes from 10.2.0.10: icmp_seq=1 ttl=63 time=1.14 ms venus# ping -c 1 10.2.0.10 | grep '64 bytes from 10.2.0.10: icmp_seq=1' [YES] 64 bytes from 10.2.0.10: icmp_seq=1 ttl=63 time=0.961 ms moon# killall tcpdump moon# cat /tmp/tcpdump.log | grep 'IP moon.strongswan.org.* > sun.strongswan.org.ipsec-nat-t: UDP' [YES] 15:02:20.027671 IP moon.strongswan.org.1025 > sun.strongswan.org.ipsec-nat-t: UDP-encap: ESP(spi=0x298a8b8d,seq=0x1), length 132 15:02:20.404306 IP moon.strongswan.org.1026 > sun.strongswan.org.ipsec-nat-t: UDP-encap: ESP(spi=0x980f7512,seq=0x1), length 132 moon# cat /tmp/tcpdump.log | grep 'IP sun.strongswan.org.ipsec-nat-t > moon.strongswan.org.*: UDP' [YES] 15:02:20.028400 IP sun.strongswan.org.ipsec-nat-t > moon.strongswan.org.1025: UDP-encap: ESP(spi=0xc7ac5a19,seq=0x1), length 132 15:02:20.404953 IP sun.strongswan.org.ipsec-nat-t > moon.strongswan.org.1026: UDP-encap: ESP(spi=0x227d232f,seq=0x1), length 132 POST-TEST sun# ipsec stop Stopping strongSwan IPsec... alice# ipsec stop Stopping strongSwan IPsec... venus# ipsec stop Stopping strongSwan IPsec... alice# /etc/init.d/iptables stop 2> /dev/null * Stopping firewall ... [ ok ] venus# /etc/init.d/iptables stop 2> /dev/null * Stopping firewall ... [ ok ] sun# /etc/init.d/iptables stop 2> /dev/null * Stopping firewall ... [ ok ] moon# iptables -t nat -F moon# conntrack -F