How do I gracefully renumber an IP subnet ?
Randy Witlicki
see-signature-for-addr at valley.net.NOSPAM
Tue Oct 5 11:59:41 UTC 1999
Hello, this is the task I have to do:
I have an IP subnet on the Internet which I have to
renumber due to a change at the upstream service provider.
This is what is in place:
- There are three domains in use (one is a subdomain)
on this subnet.
- All the primary DNS nameservers are elsewhere.
- Routing for both IP address blocks is now working.
- The hosts now, or will soon have IP addresses in
both address spaces. From elsewhere on the Internet I
can ping, traceroute, access IP ports on hosts which have
addresses in the new IP address block.
- The router (a cisco 2501) has the old IP address as the
primary address and the new IP as the secondary. The serial
link has been using "IP unnumbered" for a while and has not
needed any tinkering (so far).
- Reverse DNS for both IP blocks is already setup.
- The DNS TTL is set to 2 days.
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 ?
Thanks in advance for any help and advice !
- Randy randy.witlicki to the left of the at sign in the header
-
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