Merge into master from pull request #116:
oft: Add 'disable-ipv6' option (https://github.com/floodlight/oftest/pull/116)
diff --git a/oft b/oft
index 8a7272b..4ef82eb 100755
--- a/oft
+++ b/oft
@@ -85,6 +85,7 @@
     "default_timeout"    : 2,
     "minsize"            : 0,
     "random_seed"        : None,
+    "disable_ipv6"       : False,
 
     # Other configuration
     "port_map"           : {},
@@ -194,6 +195,8 @@
                       help="Minimum allowable packet size on the dataplane.")
     group.add_option("--random-seed", type="int",
                       help="Random number generator seed")
+    group.add_option("--disable-ipv6", action="store_true",
+                      help="Disable IPv6 tests")
     parser.add_option_group(group)
 
     # Might need this if other parsers want command line
diff --git a/src/python/oftest/packet.py b/src/python/oftest/packet.py
index 9631e02..1ed100f 100644
--- a/src/python/oftest/packet.py
+++ b/src/python/oftest/packet.py
@@ -4,15 +4,17 @@
 """
 Wrap scapy to satisfy pylint
 """
+from oftest import config
 import sys
 
 try:
     import scapy.config
     import scapy.route
-    import scapy.route6
     import scapy.layers.l2
     import scapy.layers.inet
-    import scapy.layers.inet6
+    if not config["disable_ipv6"]:
+        import scapy.route6
+        import scapy.layers.inet6
 except ImportError:
     sys.exit("Need to install scapy for packet parsing")
 
@@ -22,10 +24,12 @@
 Dot1Q = scapy.layers.l2.Dot1Q
 IP = scapy.layers.inet.IP
 IPOption = scapy.layers.inet.IPOption
-IPv6 = scapy.layers.inet6.IPv6
 ARP = scapy.layers.inet.ARP
 TCP = scapy.layers.inet.TCP
 UDP = scapy.layers.inet.UDP
 ICMP = scapy.layers.inet.ICMP
-ICMPv6Unknown = scapy.layers.inet6.ICMPv6Unknown
-ICMPv6EchoRequest = scapy.layers.inet6.ICMPv6EchoRequest
+
+if not config["disable_ipv6"]:
+    IPv6 = scapy.layers.inet6.IPv6
+    ICMPv6Unknown = scapy.layers.inet6.ICMPv6Unknown
+    ICMPv6EchoRequest = scapy.layers.inet6.ICMPv6EchoRequest