From 8aec1e2eb6376b48ac14a2921689ac7bd3bc1a74 Mon Sep 17 00:00:00 2001
From: zzz <zzz@mail.i2p>
Date: Fri, 30 Aug 2013 10:20:43 +0000
Subject: [PATCH]  * Addresses: Treat Teredo addresses 2001:0::/32 as local

---
 router/java/src/net/i2p/router/transport/TransportUtil.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/router/java/src/net/i2p/router/transport/TransportUtil.java b/router/java/src/net/i2p/router/transport/TransportUtil.java
index a37e2d542..12bd153d4 100644
--- a/router/java/src/net/i2p/router/transport/TransportUtil.java
+++ b/router/java/src/net/i2p/router/transport/TransportUtil.java
@@ -130,6 +130,9 @@ public abstract class TransportUtil {
                 // not recognized as local by InetAddress
                 if ((addr[0] & 0xfe) == 0xfc)
                     return false;
+                // disallow 2001:0::/32 (Teredo RFC 4380)
+                if (addr[0] == 0x20 && addr[1] == 0x01 && addr[2] == 0x00 && addr[3] == 0x00)
+                    return false;
                 try {
                     InetAddress ia = InetAddress.getByAddress(addr);
                     return