Owen DeLong <owen@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 -- ------------------------------------------------------------------------- | Foelderichstr. 40 | 13595 Berlin, Germany | +49-151-18721264 | | http://blog.quux.de | jabber: jenslink@guug.de | ------------------- | -------------------------------------------------------------------------