-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 12/05/14 11:47, Mark Foster wrote:
In both cases a ping against a v6 IP address is tried (and failed, as the host has no v6 connectivity - and in at least one case, v6 is actually disabled in the network interface settings).
So why is the client trying to ping a v6 address when it has no v6 connectivity?
As Brian alluded to, I commonly see this problem on a host if it has a public IPv4 address, which causes it to automatically establish a 6to4 tunnel, but subsequently the protocol 43 packets (IPv6-in-IPv4) get eaten by your external firewall. I've also seen some cases where PCs always try to establish Teredo connections. I don't believe this to be the default behaviour in Windows, but can be influenced by some third-party software — e.g. uTorrent has a button to do this. Normally I'd recommend running "route print" but if this is an automatic tunnelling issue, that may not give you the whole picture. I recommend you instead try disabling IPv6 tunnelling — the easiest method is via this page: http://go.microsoft.com/?linkid=9728872 ...from "Microsoft Fix it 50412" via this article: https://support.microsoft.com/kb/929852 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJTcDLkAAoJEDYPjTilMm9b5CsQAI05cLQtjcZgvOmEjjnXb1WY LmwI0AxvZw5LS2WIe4SUa6FzPFAc15l2zEgltcDGne1jurci3azh1yiP5V+KxTZd 4UMeO1UuNUOeeoQEe7mMErsmqGOzvR4M9gx+P/+K6pLkFJXfHHrMefZfLO3v4Pfr Aia7DjlReVogS2Aj1bWzcfOXAOkINIycS2tZURnHA/Kk/4Fsejyye39uNnBQ8pVs 2s1AtvBBKenp2+mgD0qN3e+H0e2Z8JawttunlMqRR+7HTAi9V9QiYFNis+mE0kkh sSHV9cNS4GM3WR2FemQ/kVRcvVqmojQjycpwQK/OaQcnlADSlkPdwZOFBG4Ty4X/ R0bcqmWtpGepyDUlkFy5VlK+vGLjnxM1RDoPNI6CDABnH+2sMG8PaAHrOa7lMfjb SY99mVBqxlym7lApWl9xXYUrsDWlg+DvFIbzDl87otF4KbXJ/L+bAf/UjheLoYsO oL9g81IshBdFJ2Tq/9oJ4VrBQGXhXHa3ANU5b8TF9ibzid098JMqkAIe6j7jtWJ+ Vf/flXuL6fJAfJ0FEQedcY6M80CviLPdLUpNhT6sFZxDa5AaKfMHBzIa48phuXf4 zQiYMUIbKyPhvSP/Ko3SW8ewEd3oxCcmA2vZgIelv9GuVZhaDKjBXmbPYzmS67uC d8VSGE2yrd4MlrF8RRzJ =oo46 -----END PGP SIGNATURE-----