Tim,

>> Michel Py wrote:
>> The trouble with using things such as XXXX:XXXX::/32 and
>> YYYY:YYYY::/32 is that they can't be configured on a router and
>> won't prevent the hijacking of a real prefix when labing the
>> case, which is what the documentation prefix tries to prevent
>> from happening.

> Tim Chown wrote:
> So if we do create this prefix, what's the difference between
> this and an allocated prefix for private use in networks?

Basically none.

> You're suggesting it's not a documentation prefix,

Not _only_ a documentation prefix.

> but a prefix for use in (disconnected) networks. Throw in
> v6 NAT and... ;)

This is a very valid point that has been made several times before.

It is clear that the documentation prefix is a prime candidate for
hijacking for NAT purposes. That being said, there are plenty of other
good candidates such as returned prefixes of 3ffe::/16, the entire
3ffe::/16 space after 6/6/6, 2002:RFC:1918::, a random prefix out of
unallocated space in the C000::/16 range, etc.

IMHO a _few_ /32 prefixes would be preferable for lab scenarios (for
reasons outlined earlier) and would not encourage NAT more than a single
one.


Michel.


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