Addressing plan exercise for our IPv6 course

[lists at quux.de (Jens Link)]

Owen DeLong <owen at delong.com> writes:

>> for NAT. Enterprises of non-trivial size will likely use RFC4193 (and I
>> fear we will notice PRNG returning 0 very often) and then NAT it to
>> provider provided public IP addresses. 
>>
> Why on earth would you do that? Why not just put the provider-assigned
> addresses on the interfaces along side the ULA addresses? Using ULA
> in that manner is horribly kludgy and utterly unnecessary.

To state the obvious: People are stupid. 

>> This is to facilitate easy and cheap way to change provider. Getting PI
>> address is even harder now, as at least RIPE will verify that you are
>> multihomed, while many enterprises don't intent to be, they just need low
>> cost ability to change operator.
>> 
> Why is that easier/cheaper than changing your RAs to the new provider and
> letting the old provider addresses time out?

Well it's not cheaper but using NAT (and multiple NAT) leads to job
security as nobody else will understand the network. BTST.

Jens
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