tiny modifications to VLANID

Change-Id: Ib5b1adc2c147e23ce40ee35282c1fadc82d78111
diff --git a/utils/misc/src/main/java/org/onlab/packet/IPAddress.java b/utils/misc/src/main/java/org/onlab/packet/IPAddress.java
index f7b19dc..94c2d54 100644
--- a/utils/misc/src/main/java/org/onlab/packet/IPAddress.java
+++ b/utils/misc/src/main/java/org/onlab/packet/IPAddress.java
@@ -12,7 +12,7 @@
 
     //lengths of address, in bytes
     public static final int INET_LEN = 4;
-    public static final int INET6_LEN = 6;
+    public static final int INET6_LEN = 16;
 
     protected Version version;
     //does it make more sense to have a integral address?