Re: IPv6 routing /48s

From: Florian Weimer (no email)
Date: Fri Nov 21 2008 - 10:55:42 EST

  • Next message: Jack Bates: "Re: IPv6 routing /48s"

    * Mohacsi Janos:

    > On Thu, 20 Nov 2008, Nathan Ward wrote:
    >
    >> On 20/11/2008, at 4:06 AM, Florian Weimer wrote:
    >>
    >>> * Michael Sinatra:
    >>>
    >>>> And it just reinforces the fear that people have against putting AAAA
    >>>> records in DNS for their publicly-accessible resources, especially
    >>>> www.
    >>>
    >>> Won't current Windows clients work just fine in this case?
    >>>
    >>> I have no idea what a fix should look like for some of the non-Windows
    >>> systems I care about, unfortunately.

    Do you mean that the client tries to enable 6to4 unsuccessfully?

    >> No, unfortunately broken 6to4 auto-configuration (ie, in Vista,
    >> XPSP2, when on a non-RFC1918 IP address) breaks, and you get 90s
    >> timeouts before falling back to IPv4/A.
    >
    > This must be a broken RFC 3484 implementation:
    > - 6to4 should be less prerefed than IPv4 if the service has both AAAA
    > and A record.

    RFC 3848 generally prefers IPv6 over IPv4 and fails if the host
    running its algorithm has neither IPv6 connectivity nore mean to
    detect that efficiently. I think Windows does something in the second
    area.


  • Next message: Jack Bates: "Re: IPv6 routing /48s"





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