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




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Nicholas Geovanis wrote:
> On Thu, Apr 18, 2019 at 7:57 AM Michael Stone <mstone@xxxxxxxxxx> wrote:
>
>>
>> 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.
>>
> 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?

No.  RFC1918 / ULA are merely "unroutable on The Internet" (as in, they
cannot be directly accessed from the public internet).  You can freely
route between them on "private" networks to your heart's content.

For example, I have the RFC1918 subnets

 - 192.168.1.0/24, .2.0/24, .10.0/24, and .20.0/24  (LAN networks)
 - 10.90.0.0/16 (VPN[1])

[1] way overkill, but lets me move around a bit in case a hotel is using
part of that range. (I only have the server hand out a /24 out of that
range, but the LAN's routing table uses the full /16).

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