Pekka Savola wrote: > Not so. (If you build your system in an optimal fashion -- > which really > does need a bit fleshing out, though.) So the intent is to dictate to everyone how they build their networks? > > Such prefixes would then reach valid lifetime=x, preferred > lifetime=0, be set "deprecated" and not be used for new > connections anymore. Nothing requires connections be killed > using such deprecated addresses. Get real! If the prefix is not imediately invalidated, it will be impossible to connect to nodes that now have a valid right to use that prefix. If the router does not have a current prefix allocation, it must set valid lifetime to 0. It is not reasonable to expect an automated process to figure out when you want it to keep a prefix around and when you want it to go away. Even if it could do that, one set of machines on the local network may want the opposite state from another set of machines. Tony