testing: Add ikev2/mobike-virtual-ip-nat scenario

This tests moving from a public IP behind a NAT and back (with proper
changes of the UDP encapsulation).

testing/tests/ikev2/mobike-virtual-ip-nat/hosts/sun/etc/iptables.rules

@@ -0,0 +1,32 @@
+*filter
+
+# default policy is DROP
+-P INPUT DROP
+-P OUTPUT DROP
+-P FORWARD DROP
+
+# allow IPsec tunnel traffic
+-A FORWARD -m policy --dir in  --pol ipsec --proto esp -j ACCEPT
+-A FORWARD -m policy --dir out --pol ipsec --proto esp -j ACCEPT
+
+# allow ESP
+-A INPUT  -i eth0 -p 50 -j ACCEPT
+-A OUTPUT -o eth0 -p 50 -j ACCEPT
+
+# allow IKE
+-A INPUT  -i eth0 -p udp --dport 500 -j ACCEPT
+-A OUTPUT -o eth0 -p udp --sport 500 -j ACCEPT
+
+# allow MobIKE
+-A INPUT  -i eth0 -p udp --dport 4500 -j ACCEPT
+-A OUTPUT -o eth0 -p udp --sport 4500 -j ACCEPT
+
+# allow ssh
+-A INPUT  -p tcp --dport 22 -j ACCEPT
+-A OUTPUT -p tcp --sport 22 -j ACCEPT
+
+# allow crl fetch from winnetou
+-A INPUT  -i eth0 -p tcp --sport 80 -s PH_IP_WINNETOU -j ACCEPT
+-A OUTPUT -o eth0 -p tcp --dport 80 -d PH_IP_WINNETOU -j ACCEPT
+
+COMMIT