Merge pull request #601 from deavmi/patch-2

Allow binding to IPv6 (if present)

RNS/Interfaces/TCPInterface.py

@@ -414,6 +414,11 @@ class TCPServerInterface(Interface):
     def get_address_for_if(name):
         import RNS.vendor.ifaddr.niwrapper as netinfo
         ifaddr = netinfo.ifaddresses(name)
+
+        # IPv6 preference (if present)
+        if(netinfo.AF_INET6 in ifaddr):
+            return ifaddr[netinfo.AF_INET6][0]["addr"]
+        
         return ifaddr[netinfo.AF_INET][0]["addr"]
 
     @staticmethod