Just following up in case anyone is interested...
We made the transition yesterday (during business hours even!) with no
issues at all. I more-or-less followed the advice of Edward Ned Harvey,
which was (paraphrasing)
- Set up scopes, options, reservations etc. on new DHCP server (Windows
2008 R2) in advance, but disabled
- Enable conflict detection on the new DHCP server (attempts=2)
- Enable the new server and disable the old.
I fired up Wireshark during the cut-over. As it turns out, when the
clients try to renew their leases they send their current IP address.
Each client would hit the old server a few times with DHCP INFORM and
get back ICMP destination unreachable. Then they try DHCP INFORM to the
broadcast address. The new server sees that, checks the client address,
yep that's available as far as he knows, sends back a DHCP ACK to the
client with new address = current address. So in the end the cut-over
was completely transparent, the clients didn't even see an IP address
change.
Thanks to everyone that offered advice!
Roy
On 10/15/12 3:38 PM, Roy McMorran wrote:
Hi All,
The ancient Sun Fire 280R that's been our DHCP server for about a
decade needs to be out of here, and soon. It's running the stock
Solaris 10 DHCP server software. I'm inclined to let one of our
Windows 2008 R2 servers take over the DHCP duties (although I might be
persuaded to go a different way, e.g. ISC DHCP on RedHat, but DNS is
already on Windows so...). This is a pretty small environment, with
only about 130 dynamically-assigned addresses, all in one contiguous
range. I assume there's no way to transport the current lease
information between such disparate servers. Any suggestions on making
the transition go smoothly?
Thanks,
Roy
--
Roy McMorran
Bar Harbor, ME
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--
Roy McMorran
Bar Harbor, ME
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