Re: [cobalt-users] (Raq4) 2 IP Addresses for 1 nic

[Brent Sims <bs@xxxxxxxxxxx>]

On Thu, 28 Feb 2002, William J.A. Brillinger wrote:

} 1 - bind the new address to your machine, and keep the
}      original one there as well.
} 2 - change DNS to go to the new IP.
} 3 - After 24 hours we test each domain.
} 4 - After 48 hours, we unbind the old IP.
} 5 - We re-test.
}
} I don't see that the Raq supports 2 IPs for 1 nic, how would I do this?
} All of my sites are name based.

Hi William,

	Having renumbered about a dozen networks last year, I thought I'd
chime in.

	While I am not sure how others do it, with very important
exception I've personally always done pretty much what you list
above. The important exception I mentioned is cut the TTL down on
your zone files to perhaps 5 minutes about a week before you do the
swap. Binding the second IP address to the NIC is not hard at all.
You can do it at the command line with the (man) ifconfig command,
or if you have an unused domain name just set it up on the server on
the new IP address then swap out the rest of them by changing their
IP addresses via the GUI.

	I'll hereby publically admit that I was scared to death the
first time I renumbers and, well, truth be told I've been scared
every time since but I've never had a lick of a problem. Just go
slow and easy. I prefer having a helper when I do this. If one
person handles the site changes and the other handles the DNS
changes, and you are both in the same room so coordination is
easy, you can buzz right along at a pretty fair clip while still
taking the time to carefully check the changes before you commit
them.


	Peace be with you,

	Brent Sims
	WebOkay Internet Services, LLC
	http://www.WebOkay.net
	mailto: Brent@xxxxxxxxxxx
	(719) 595-1427 (Voice/Fax)