Re: [cobalt-users] [RaQ3]moving name servers from one IP to another (plus all domains named by the dns)

[Oleg Volkov <voleg@xxxxxxxxxxxx>]

On Tuesday 17 September 2002 16:04, Kim Schulz wrote:
> [snip]
>
> > All domains, served by your DNS,
> > has record at their registrar pointing on the NAME
> > of your DNS server.
> >
> > So, the quick and dirty solution is to set up new DNS server
> > at new IP, and change YOUR record about DNS server.
> > Of course you should fix NS recodrs to new IP in your local
> > files. The smart (IMHO) solution is to use $include directive
> > and change IP in the only one place.
> >
> > Why you need two DNS ? Because DNS propagation takes time
> > It is not immediate process.
>
> In Denmark you have to have 2 DNS servers if you are an ISP.

By second DNS I supposed actually the third DNS, that should 
replace one of the previous. But actually even this does not needed.
You should move the only one DNS to other segment. For those computers
that  cached old DNS settings will be enough communicate with secondary DNS,
and those computers already got new DNS settings will go to both of them.

This is a good practice to put two DNSes on different subnets, and the better
solution to put them in different buildings.

Do not forget to configure access between two DNSes.

> I dont know how you would achive the $include idea. Could you explain
> that one more precise. ?

You can write common data in external file and include it
in any point of DNS file by $INCLUDE directive.

But after second think about your issue, I think that you have do 
nothing with this.

Every your domains include line like:
	IN NS dns1.yourdomain.
, right ? ( I suppose you was not use IP for this )

In this case it should be enough to change only your A records
about DNS 1/2.

-- 
Oleg Volkov

SHUNRA Software Ltd.
System Administrator
voleg@xxxxxxxxxxxx
http://www.shunra.com

+972-51-601-914 (m)
+972-9-7643743/93121 (w)