topic Re: Windows lost IPV6 connection. in IPv6 Trial

Windows lost IPV6 connection.

David_W — Fri, 17 Jun 2011 18:04:36 GMT

No idea why it's happening but Windows isn't connecting via IPV6 at the moment. As the screenshot shows I can ping ipv6.google.com so my router has connectivity so it's something on my Windows side, to me it looks a bit like Windows is being given too many addresses via DCHP or am I totally wrong and missing something? If it is that, how do I ensure that my router (Cisco 877W) will kill the lease on inactive IPV6 addresses if it needs to?

Re: Windows lost IPV6 connection.

brueton — Fri, 17 Jun 2011 18:12:38 GMT

A bit more information would be useful.
Version on Windows?
DNS settings?
dig / nslookup on problem sites?
I am sure others will have additional questions.
PB

Re: Windows lost IPV6 connection.

David_W — Fri, 17 Jun 2011 21:58:38 GMT

Windows 7
DNS is automatic (PlusNet/HE)

Quote
C:\Users\David>nslookup ipv6.google.com
Server: cdns02.plus.net
Address: 212.159.6.10
Non-authoritative answer:
Name: ipv6.l.google.com
Address: 2a00:1450:400c:c00::67
Aliases: ipv6.google.com

Quote
C:\Users\David>ping ipv6.google.com
Pinging ipv6.l.google.com [2a00:1450:400c:c01::63] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 2a00:1450:400c:c01::63:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

IPV6 test says my connection is not IPV6 capable, but it is, my router is connected via IPV6, wait, I forgot the screenshot didn't I?

Re: Windows lost IPV6 connection.

brueton — Sat, 18 Jun 2011 05:12:16 GMT

The screen shot of your network connection details does look odd when compared with mine.
I only have one entry against IPv6 Address.
You do not have any entries against IPv6 DNS servers, I have two, I set my router up for the HE DNS as primary and Open DNS as secondary.
What does a tracert give?
PB

Re: Windows lost IPV6 connection.

MJN — Sat, 18 Jun 2011 08:44:06 GMT

Remember that IPv6 connectivity doesn't depend on IPv6-enabled DNS servers when dual stacked - AAAA records can still be obtained over IPv4 so don't let their absence be a red herring.
As Pete suggests, a traceroute would be helpful as would the output of route print (ipconfig /all would also be potentially less ambiguous than the GUI output).
Mathew

Re: Windows lost IPV6 connection.

David_W — Sat, 18 Jun 2011 09:58:41 GMT

Rebooting Windows fixed it, I believe the problem is that Windows doesn't realise the IPV6 address it has is no longer valid so instead of release/renew it just adds the IPV6 address which ends up with multiple IPV6 addresses and the ability to use none. For instance, if I were to issue a reload command on my router it would reboot and issue a new IPV6 address to Windows, Windows would accept the new IPV6 address but not delete the old IPV6 address.
It's the same issue as when I was using HE and switched to PN, Windows still used the HE IPV6 details even though they no longer existed, so I'm thinking it's a bug in Windows.
/edit - I have 2 screenshots, the first is my IPV6 status before a reload command and after, as you can see the router rebooted and dished out a new IPV6 address, but Windows was unable to release the original IPV6 address meaning I'm stuck with a non-working IPV6 (unless I restart the network on my side). Is the same true with different routers or is this behaviour limited to Cisco?