From b6cdfd39d368251ea1b1913c1580b7a3c335ff78 Mon Sep 17 00:00:00 2001
From: Nikolay Shopik <shopik@nvcube.net>
Date: Tue, 9 May 2017 23:56:16 +0300
Subject: [PATCH] detect and ignore teredo/6to4

---
 blockcheck.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/blockcheck.py b/blockcheck.py
index 05f5cb6..32c43ab 100755
--- a/blockcheck.py
+++ b/blockcheck.py
@@ -781,8 +781,11 @@ def check_ipv6_availability():
     if (v6addr):
         v6 = _get_url("http://ipv6.icanhazip.com/", ip=v6addr[0])
         if len(v6[1]):
-            print(": IPv6 доступен!")
-            return v6[1].strip()
+            v6src = v6[1].strip()
+            if (ipaddress.IPv6Address(v6src).teredo == None and 
+                ipaddress.IPv6Address(v6src).sixtofour == None):
+                print(": IPv6 доступен! (Teredo/6to4 игнорируем)")
+            return v6src
     print(": IPv6 недоступен.")
     return False