diff --git a/router/java/src/net/i2p/router/transport/TransportImpl.java b/router/java/src/net/i2p/router/transport/TransportImpl.java
index 81a498bced..eafaad165e 100644
--- a/router/java/src/net/i2p/router/transport/TransportImpl.java
+++ b/router/java/src/net/i2p/router/transport/TransportImpl.java
@@ -529,22 +529,27 @@ public abstract class TransportImpl implements Transport {
      *  Notify a transport of an external address change.
      *  This may be from a local interface, UPnP, a config change, etc.
      *  This should not be called if the ip didn't change
-     *  (from that source's point of view), or is a local address,
-     *  or if the ip is IPv6, but the transport should check anyway.
+     *  (from that source's point of view), or is a local address.
+     *  May be called multiple times for IPv4 or IPv6.
      *  The transport should also do its own checking on whether to accept
      *  notifications from this source.
      *
      *  This can be called before startListening() to set an initial address,
      *  or after the transport is running.
      *
+     *  This implementation does nothing. Transports should override if they want notification.
+     *
      *  @param source defined in Transport.java
-     *  @param ip typ. IPv4 non-local
+     *  @param ip typ. IPv4 or IPv6 non-local
      *  @param port 0 for unknown or unchanged
      */
     public void externalAddressReceived(String source, byte[] ip, int port) {}
 
     /**
      *  Notify a transport of the results of trying to forward a port.
+     *
+     *  This implementation does nothing. Transports should override if they want notification.
+     *
      *  @param port the internal port
      *  @param externalPort the external port, which for now should always be the same as
      *                      the internal port if the forwarding was successful.
diff --git a/router/java/src/net/i2p/router/transport/TransportManager.java b/router/java/src/net/i2p/router/transport/TransportManager.java
index 3c1942ce55..958c0f5508 100644
--- a/router/java/src/net/i2p/router/transport/TransportManager.java
+++ b/router/java/src/net/i2p/router/transport/TransportManager.java
@@ -101,19 +101,21 @@ public class TransportManager implements TransportEventListener {
         return ctx.getBooleanPropertyDefaultTrue(PROP_ENABLE_NTCP);
     }
     
+    /**
+     *  Notify transport of ALL routable local addresses, including IPv6.
+     *  It's the transport's job to ignore what it can't handle.
+     */
     private void initializeAddress(Transport t) {
-        String ips = Addresses.getAnyAddress();
-        if (ips == null)
-            return;
-        InetAddress ia;
-        try {
-            ia = InetAddress.getByName(ips);
-        } catch (UnknownHostException e) {
-            _log.error("UDP failed to bind to local address", e);
-            return;
+        Set<String> ipset = Addresses.getAddresses(false, true);  // non-local, include IPv6
+        for (String ips : ipset) {
+            try {
+                InetAddress ia = InetAddress.getByName(ips);
+                byte[] ip = ia.getAddress();
+                t.externalAddressReceived(Transport.SOURCE_INTERFACE, ip, 0);
+            } catch (UnknownHostException e) {
+                _log.error("UDP failed to bind to local address", e);
+            }
         }
-        byte[] ip = ia.getAddress();
-        t.externalAddressReceived(Transport.SOURCE_INTERFACE, ip, 0);
     }
 
     /**
diff --git a/router/java/src/net/i2p/router/transport/udp/UDPTransport.java b/router/java/src/net/i2p/router/transport/udp/UDPTransport.java
index 47c822025c..84d3dec852 100644
--- a/router/java/src/net/i2p/router/transport/udp/UDPTransport.java
+++ b/router/java/src/net/i2p/router/transport/udp/UDPTransport.java
@@ -511,11 +511,15 @@ public class UDPTransport extends TransportImpl implements TimedWeightedPriority
         _lastInboundReceivedOn = System.currentTimeMillis(); 
     }
     
+    // temp prevent multiples
+    private boolean gotIPv4Addr = false;
+    private boolean gotIPv6Addr = false;
+
     /**
      * From config, UPnP, local i/f, ...
      *
      * @param source used for logging only
-     * @param ip publicly routable IPv4 only
+     * @param ip publicly routable IPv4 or IPv6
      * @param port 0 if unknown
      */
     @Override
@@ -527,10 +531,22 @@ public class UDPTransport extends TransportImpl implements TimedWeightedPriority
         String sources = _context.getProperty(PROP_SOURCES, DEFAULT_SOURCES);
         if (!sources.contains(source))
             return;
+        if (!isValid(ip))
+            return;
+        if (source.equals(Transport.SOURCE_INTERFACE)) {
+            // temp prevent multiples
+            if (ip.length == 4 && !gotIPv4Addr) {
+                gotIPv4Addr = true;
+                return;
+            } else if (ip.length == 16 && !gotIPv6Addr) {
+                gotIPv6Addr = true;
+                return;
+            }
+        }
         boolean changed = changeAddress(ip, port);
         // Assume if we have an interface with a public IP that we aren't firewalled.
         // If this is wrong, the peer test will figure it out and change the status.
-        if (changed && source.equals(Transport.SOURCE_INTERFACE))
+        if (changed && ip.length == 4 && source.equals(Transport.SOURCE_INTERFACE))
             setReachabilityStatus(CommSystemFacade.STATUS_OK);
     }
 
@@ -620,6 +636,7 @@ public class UDPTransport extends TransportImpl implements TimedWeightedPriority
     }
     
     /**
+     * @param ourIP MUST have been previously validated with isValid()
      * @param ourPort >= 1024 or 0 for no change
      */
     private boolean changeAddress(byte ourIP[], int ourPort) {