RE: [NTISP] Advice on Changing Backbone Providers

Pablo F. Garcia Melga ( (no email) )
Wed, 7 Jul 1999 10:09:54 -0300

Hi, my name is Pablo Garcia, recently we had to make the same changes you're
facing, we kept the old addresses but in our cisco router we set-up a
bidireccional NAT for the old address scheme, by doing this we haven't had
any problems .
However I recomend you to set-up your NASes in order to send automatically
your DNS settings instead of having to write them manually.

Best Regards, Pablo

-----Original Message-----
[]On Behalf Of Adam Greene
Sent: Tuesday, July 06, 1999 5:37 PM
Subject: Re: [NTISP] Advice on Changing Backbone Providers

Thanks to everyone (including Terry) who responded to my original question
about switching backbone providers.

One person I spoke to outside this list suggested that I keep the old IP
addresses and DNS mapping for our nameservers on our network even after we
switch to the new backbone provider. He said that by doing this, all of our
existing dialup customers can keep their Primary and Secondary DNS DUN
settings unchanged, since our nameservers will still be associated with the
old addresses. As new customers sign up, we would have them configure their
DUN settings with the new numbers, but we wouldn't have to spend the hours
of technical support helping our existing customers change their DUN

Does this plan sound plausible to anyone? I'm wondering if there will be
any routing issues on the Internet at large if only our dialup customers use
the old DNS numbers. If not, it seems like maybe this is the right approach
to take (in addition to the other steps recommended by Terry and others, of

-----Original Message-----
From: Terry Bomersbach <>
To: <>
Date: Monday, July 05, 1999 8:43 AM
Subject: Re: [NTISP] Advice on Changing Backbone Providers

Sprint is a tad slower but always consistent. We found that during the
changing of the guard at MCI, they were constantly loosing routers so we had
to fall back to Sprint for our upstream.

I'd recommend running dual systems for about two weeks and slowly moving
traffic over to the new IPs until only your Mail, FTP, WWW, Primary and
Secondary DNS servers are the only machines on the old subnets. Then just
kill the old subnet and move on without a hitch.

Please note that if you have colocates, they will need to make sure that
they update their records with internic also.

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