From 2a269ff1a9cc512804c97bf75387c337aa24f361 Mon Sep 17 00:00:00 2001
From: zzz <zzz@mail.i2p>
Date: Fri, 13 Jun 2014 13:39:15 +0000
Subject: [PATCH] * Transports: Disallow Carrier Grade NAT (RFC 6598)
addresses
---
router/java/src/net/i2p/router/transport/TransportUtil.java | 2 ++
1 file changed, 2 insertions(+)
diff --git a/router/java/src/net/i2p/router/transport/TransportUtil.java b/router/java/src/net/i2p/router/transport/TransportUtil.java
index 0332a9105b..1682abd91c 100644
--- a/router/java/src/net/i2p/router/transport/TransportUtil.java
+++ b/router/java/src/net/i2p/router/transport/TransportUtil.java
@@ -124,6 +124,8 @@ public abstract class TransportUtil {
// Assigned to UK Ministry of Defence
// http://blog.logmein.com/products/changes-to-hamachi-on-november-19th
if (a0 == 25) return false;
+ // Carrier Grade NAT RFC 6598
+ if (a0 == 100 && a1 >= 64 && a1 <= 127) return false;
return true; // or at least possible to be true
} else if (addr.length == 16) {
if (allowIPv6) {
--
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