Issues encountered with assigning all ones IPv6 /64 address? (Was Re: Issues encountered with assigning .0 and .255 as usable addresses?)

Rob Laidlaw laidlaw at consecro.com
Tue Oct 23 13:16:48 UTC 2012


RFC 2526 reserves the last 128 host addresses in each subnet for anycast use.

On Tue, Oct 23, 2012 at 7:15 AM, Andy Smith <andy at strugglers.net> wrote:
> Hello,
>
> On Mon, Oct 22, 2012 at 10:07:50PM +0000, Paul Zugnoni wrote:
>> Curious whether it's commonplace to find systems that
>> automatically regard .0 and .255 IP addresses (ipv4) as src/dst in
>> packets as traffic that should be considered invalid.
>
> On a separate note, one of my customers discovered over the weekend
> that if they bring up an all ones IPv6 address in their /64
> (2001:db8:1:1:ffff:ffff:ffff:ffff) then they can't exchange traffic
> with stuff hosted at hetzner.de such as archives.postgresql.org or
> 1-media-cdn.foolz.us. Seems filtered somewhere inside Hetzner.
>
> I found the same if I brought up an all ones address in any other
> /64 in the same /48 as well. Using ...ffff:ffff:ffff:fffe worked
> fine.
>
> I haven't had time to investigate further or tell them yet, though.
>
> Is that sort of thing common?
>
> Cheers,
> Andy
>
> --
> http://bitfolk.com/ -- No-nonsense VPS hosting
>



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