Subject: Re: Non-existing DNS servers on windows

Re: Non-existing DNS servers on windows

From: Steinar H. Gunderson <sesse_at_google.com>
Date: Fri, 21 Oct 2011 12:56:18 +0200

On Thu, Oct 20, 2011 at 03:35:33PM -0700, Bert Belder wrote:
> Windows always reports some hard-coded IPv6 DNS servers that don't actually
> exist. I see three of them, they're all prefixed with fec0:0:0:ffff. This
> often doesn't hurt, but it does hurt when these rogue nameservers end up at
> the top of the server list, because c-ares first tries all of them before it
> moves on to something that does work.

They're not rogue; they're intended for IPv6 anycast DNS service. The RFC in
question is expired, though, and these days, DHCPv6 is probably the most
common way of configuring DNS for IPv6.

I didn't think they came in the list if you actually had any other DNS
servers (e.g., via DHCPv6), but I might be mistaken.

/* Steinar */

-- 
Software Engineer, Google Switzerland
Received on 2011-10-21