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

Andy Smith andy at
Tue Oct 23 12:15:32 UTC 2012


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 such as or 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

I haven't had time to investigate further or tell them yet, though.

Is that sort of thing common?


-- -- No-nonsense VPS hosting

More information about the NANOG mailing list