On Wed, Apr 17, 2019 at 08:06:05PM -0000, Curt wrote:
On 2019-04-17, Pascal Hambourg <pascal@plouf.fr.eu.org> wrote:Le 17/04/2019 à 18:42, Michael Stone a écrit :On Wed, Apr 17, 2019 at 12:38:11PM -0400, Celejar wrote:On Wed, 17 Apr 2019 12:10:56 -0400 Michael Stone <mstone@debian.org> wrote:On Wed, Apr 17, 2019 at 11:57:43AM -0400, Celejar wrote: >I was rather shocked to see that there was no definitive solution to >avoid address collisions Sure there is--globally unique IPs.I assume you're referring to IPv6? I was referring to IPv4.It applies to both, though we've run out of IPv4. There's no other way to guarantee the absence of network collisions.A properly generated IPv6 ULA (Unique Local Address) prefix is unlikely to have collisions.I thought that was exactly what he was saying.
No, the ULA is the IPv6 equivalent of RFC1918 space--you can use it internally without central registration by choosing a subnet from fd00::/8. The space is so much larger that it's much less likely that two sites would pick the same prefix, but there are no guarantees.