Hi, Ole, On 04/26/2013 06:11 AM, Ole Troan wrote: >> If you want a stable address, you want to use something that >> actually has the exact stability properties you require, and >> interface indexes and names are seldom what you actually need. > > could we simplify the hash to only include the prefix, cookie and DAD > counter: > > RID = F(Prefix, secret_key, DAD_Counter) > > an implementation that wants a stable address for cases where > DAD_Counter > 0, must keep state. e.g. maintain a table of prefix, > dad_counter or list of previous addresses. You you do not include some sort of "Interface ID", then, when two interfaces are employed to connect to the same network, you are guaranteed to get a collision... -- Fernando Gont SI6 Networks e-mail: fgont@xxxxxxxxxxxxxxx PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492