No order. Nameservers are supplied round-robin by the root servers. If you do a dig on the domain name several times you'll see a different nameserver is supplied first almost every time. Your resolver takes this list and tries the first one it gets, and moves on from there.
Charles Daminato OpenSRS Product Manager Tucows Inc. - [EMAIL PROTECTED] > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of > [EMAIL PROTECTED] > Sent: June 6, 2002 11:18 AM > To: [EMAIL PROTECTED] > Subject: What order do nameservers resolve > > > Is there any guarantee that nameservers will resolve in any particular > order? > > I have a customer who has defined his list of nameservers as: > > ns1.1domain.com > ns1.seconddomain.com > ns2.seconddomain.com > > He is migrating his domain from one IP address to another, and has the > first nameserver pointing at his old IP, and the second and third > pointing at his new IP. > > He is not ready for the general public to see the site on it's new IP > address, and things have been working fine for the last few weeks. > > Today, his site is not resolving through the first nameserver at all - > though the nameserver is up and available and in use by many other > sites. His domain is resolving only through the second nameserver, which > is the "wrong" IP address. > > What causes this? I thought that if the first server was up and > available it would be used - however that does not appear to be the case > here. The first server is up and available, but the second server is the > one answering all requests for the domain. > > I can't see what internic's whois says - it appears to be down. > > Comments? > > Thanks, > > -Tim > > > >
