From 82348e1537442f9f167e4365f3e3024cf70b2b8d Mon Sep 17 00:00:00 2001
From: Adam Ierymenko <adam.ierymenko@gmail.com>
Date: Wed, 10 Feb 2016 11:06:26 -0800
Subject: Temporarily blacklist he.net IPv6 tunnel addresses for paths: these
 usually have a very low MTU which causes packet loss and other issues.

---
 node/Path.hpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/node/Path.hpp b/node/Path.hpp
index be64f334..cb7622d3 100644
--- a/node/Path.hpp
+++ b/node/Path.hpp
@@ -243,6 +243,14 @@ public:
 				case InetAddress::IP_SCOPE_PSEUDOPRIVATE:
 				case InetAddress::IP_SCOPE_SHARED:
 				case InetAddress::IP_SCOPE_GLOBAL:
+					if (a.ss_family == AF_INET6) {
+						// TEMPORARY HACK: for now, we are going to blacklist he.net IPv6
+						// tunnels due to very spotty performance and low MTU issues over
+						// these IPv6 tunnel links.
+						const uint8_t *ipd = reinterpret_cast<const uint8_t *>(reinterpret_cast<const struct sockaddr_in6 *>(&a)->sin6_addr.s6_addr);
+						if ((ipd[0] == 0x20)&&(ipd[1] == 0x01)&&(ipd[2] == 0x04)&&(ipd[3] == 0x70))
+							return false;
+					}
 					return true;
 				default:
 					return false;
-- 
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