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Re: [OT] IP address collisions (was: Accessing a host with variable IP addresses / connection types)

On Thu, Apr 18, 2019, 8:29 AM Michael Stone <mstone@xxxxxxxxxx> wrote:
On Thu, Apr 18, 2019 at 08:12:04AM -0500, Nicholas Geovanis wrote:
>But isn't it irrelevant whether they pick the same prefix or not? Routers that
>respect ULA and RFC1918 shouldn't route any traffic destined to them off the
>logical subnet. Right?

If it didn't matter, people wouldn't keep looking for solutions, right?
In theory, you're right. In the real world, companies merge, etc., and
stuff that started independently gets VPN'd together and things break.

This is correct as far as it goes. If corps merge and their internal IP addresses overlap, they sort it out. There is no addressing based solution other than creative routing.