> jinmei suggested that it may be better to send TCP RST with deprecated
> source, as it will help clients to try the next available address
> (on getaddrinfo chain, or something). i tend to agree.
I think this is bad since there might be old AAAA/A6 record sets cached
(due to their DNS ttl not having expired yet) that only include the
old, now deprecated, address.
Imagine a DNS ttl of 1 hour.
T = 0: Configure new prefixes using router renumbering. Initially as
deprecated. T = 5 minutes. Test new address (and old) can be reached i.e.
routing works. T = 6 minutes. Update DNS to have only new addresses.
T = 7 minutes. Use router renumbering to mark new address as preferred and old
addresses as deprecated.
T >> 1 hour 6 minutes. (Actual number depends on how long lived TCP
connections
and other sessions you'd like to handle. But at least the DNS ttl).
Time to remove the old address using router renumbering i.e. make
routing of old addresses no longer work.
I don't think you want an outtage of 59 minutes in this case.
Erik
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