Posted Jul 23, 2011 16:23 UTC (Sat) by Cyberax (✭ supporter ✭, #52523)
In reply to: IPv6 NAT by baldur
Parent article: IPv6 NAT
Link-local addresses are useless. They JustDoNotWork(tm).
First, not all services accept link-locals. Second, they are not routed.
>Then you propose to use NAT to convert that range to your real public address range. But why would you do that?
Because alternatives suck.
>It is so much simpler to assign both a private AND a public IP to every device. If you are multihomed you simply assign two public IPs to everyone. In case you are wondering: How long does it take for everyone to switch to the backup if the primary fails: 30 seconds (the NUD timeout).
Yeah, yeah. Now try this _in_ _practice_. Printers and other networked devices usually don't support it. And even desktop computers have problems with choosing correct addresses.
AND you're not solving the problem with renumbering, you're actually making it even worse (which IP address should be registered in DNS if we have three uplinks?).
Oh, and I actually help to support a production IPv6 network of about 1000 devices. Try this, and you'll rapidly realize that IPv6 is just not yet ready for the real world.