enabled ip6tables-based firewalling in first two IPv6 scenarios

testing/tests/ipv6/net2net-ikev1/posttest.dat

@@ -4,3 +4,5 @@ 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"
+moon::/etc/init.d/iptables stop 2> /dev/null
+sun::/etc/init.d/iptables stop 2> /dev/null