ISP Switch / DNS problem

[Mark_Andrews at isc.org]

> In article <a8uvod$1dk at pub3.rc.vix.com>,  <mrm00k at yahoo.com> wrote:
> >We are switching ISP's and we host our own DNS server. The IP address
> >of the DNS server will be changed.
> 
> What about your secondary DNS servers?  If you have off-site secondaries,
> they don't need to change at the same time.  If you don't currently have
> off-site secondaries, can your new ISP provide that service?  If so, get
> them to set up secondary DNS now, pulling from your old address, and add
> them to the domain registration.  Then when you move your primary server,
> they can start pulling from the new address, and you can update the host
> registration of your name server to point to the new address.

	In fact you can have the secondaries configured to pull
	from both the old and new addresses.  That way when you
	change addresses the secondary will be not need to be updated
	immediately.

	You can also add the new addresses for the critical servers
	a short time (< 30 min) before the change over.  They will
	appear to be multihomed with one interface down.  Once you
	have completed the move you can delete the old address.

	Also DHCP is a great aid in renumbering.  It's well worth the
	effort of moving to DHCP if you are not already using it.

	Mark
> 
> -- 
> Barry Margolin, barmar at genuity.net
> Genuity, Woburn, MA
> *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
> Please DON'T copy followups to me -- I'll assume it wasn't posted to the gr
> oup.
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org