>This is off topic but you guys/gals are the experts so please
>help if you can...
>
>We are about to change our internet service provider which means
>new sets of IPs (4 class C's) and so EVERYTHING has to be changed.
>
>Any advice from those who've been there, done that, got the T-shirt?
Yep, been there, done that. We had an old Sprint single Class C and we
had to move to a /20 on our new provider. What we did is route the old
Class C (temporarily) through our new provider. Then we set up a linux
router box that had 2 ether nic interfaces. One with a new IP number
and one with the old primary DNS number (it ran as primary DNS for the old
network), the second ethernet interface on the old address was linked to a
second box that ran as secondary DNS. Ie, I ran a 2 machine network on
the old primary and secondary IP numbers and continued to route that whole
Class C to those two machines. And then I put everything on the new
network. As long as your two machines answer up on the old DNS addresses
and give the correct (new IP numbers) addresses, the change should be
reasonably transparent. You can also do this with IP aliasing. If the old
provider refuses to route that Class C to the new address, the least they
should do is provide a name server on his their end that points to your
new addresses until you get a chance to get everything and the NIC
switched over. We had the luxury of running two sets of nameservers (the
linux gateway actually did double duty for both nets so it was actually 3
machines) for a couple weeks as your dial-in customers will be the last to
switch themselves over. For us it went pretty smooth.
Yeah I got a tshirt (Actually 2 one new and one old)
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