How do I gracefully renumber an IP subnet ?

[Barry Margolin]

In article <7tcp7d$p9k$1 at merrimack.Dartmouth.EDU>,
Randy Witlicki <see-signature-for-addr at valley.net.NOSPAM> wrote:
> Here is the DNS transition plan that I have sketched out:
>
>  Day 0:  Set DNS TTL to 1 hour for all affected IP addresses.
>
>  Day 0 + 3 days:
>     Change DNS addresses to new IP address block.
>     Set DNS TTL back to 2 days.
>     Reconfigure interfaces on router and hosts with new
>IP addresses as primary and old addresses as secondary.
>
>   About a week after this, the old IP address block will
>be removed.
>
>  Am I missing anything here ?

I would hold off on setting the TTL back to 2 days until you're sure
everything is working.  That way, if you need to revert to the old DNS the
transition will be relatively quick.

Other than that, it's basically the procedure I recommend to my customers.

-- 
Barry Margolin, barmar at bbnplanet.com
GTE Internetworking, Powered by BBN, Burlington, MA
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