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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: who gets a /32 [Re: IPV6 renumbering painless?]
On 19-nov-04, at 5:38, Stephen Sprunk wrote: According to multi6, you will get PA space from each of your ISPs and overlay a prefix from each on every subnet. I'll save y'all another rant on the workability of that model... Some fear that you would more likely just generate a ULA, use that internally, and NAT at the borders.It isn't contrary to multi6 gospel to have the address swapping be done by boxes somewhere in the middle rather than have all hosts do it for themselves. In other words, you get the advantage of NAT: you only have to implement multiple addresses in a few places, along with the advantages of no NAT: the process is reversed at the other end so protocols that break NAT assumptions keep working. Note that at this time the main focus of the IETF multi6 working group is taking regular communication (such as a TCP session between PA addresses at both ends) and then repair outages using additional PA addresses. Another way to do this is to use non-routable addresses (such as unique site locals) as the addresses that transport protocols such as TCP and applications see, and start remapping those to/from PA addresses from the start. However, this isn't backward compatible and it's more complex so we're not focussing on this approach at this time. I'm pretty confident that we can add this as an additional option later, though.
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