Search Again: Re: root-server information From: Men & Mice Support Date: Thursday, June 15, 2000 Time: 9:24:03 am At 2:31 PM +0100 6/15/00, Paul Willis wrote: >Hi > >One of our customers had trouble accessing their website. Everything >seemed fine from our end so I was poking around looking at the DNS >with DNS Expert Standard. > >Querying the root servers a through to m one at a time for the >domain only returned the correct response our name servers 6 times >out of 13. > >I tried with my own domain 'netro42.com' and got a similar response. > >a.root-servers.net - OK >b.root-servers.net - list of root servers >c.root-servers.net - list of root servers >d.root-servers.net - list of root servers >e.root-servers.net - OK >f.root-servers.net - OK >g.root-servers.net - OK >h.root-servers.net - list of root servers >i.root-servers.net - OK >j.root-servers.net - list of root servers >k.root-servers.net - list of root servers >l.root-servers.net - list of root servers >m.root-servers.net - list of root servers > >Surely they should all return details of our name servers? Nope. If you look closely at the response from b, c, d, h, etc., it's not a list of root servers. Mostly, it's a list of, for example, d.gtld-servers.com. Most of the root servers were unable to cope with the amount of traffic they were getting. So the com domain (along with others) was delegated to a few root servers + the gtld-servers.net servers - "gtld" stands for "global top-level domain". So if you ask any of the root servers for NS records for com, you'll get this list: com. NS a.root-servers.net. com. NS e.root-servers.net. com. NS f.root-servers.net. com. NS g.root-servers.net. com. NS a.gtld-servers.net. com. NS c.gtld-servers.net. com. NS f.gtld-servers.net. com. NS h.gtld-servers.net. com. NS i.gtld-servers.net. com. NS j.gtld-servers.net. com. NS k.gtld-servers.net. com. NS m.gtld-servers.net. I added a blank line so you can see easily which are root servers and which are gtld servers. ____________________________________________________________________ Chris Buxton cbuxton@menandmice.com Men & Mice http://www.menandmice.com Makers of: QuickDNS Pro

Messages In This Thread: root-server information by Paul Willis on Jun 15, 2000 at 6:33:45 am Re: root-server information by Men & Mice Support on Jun 15, 2000 at 9:24:03 am Re: root-server information by Global Homes Webmaster on Jun 15, 2000 at 10:12:05 am