Search Again: Re: secondary server not working on most domains From: Global Homes Webmaster Date: Monday, June 4, 2001 Time: 4:32:46 pm On 06/04/01 at 18:38, Robert Burr wrote: > On another note, I am running reverse DNS for all my servers and > workstations in my local area net, but how can I be sure by new ISP > has delegated them to my dns server? By querying the root servers for the reverse zone and following the NS records. Starting from quantumleap.net, which resolves to 64.243.104.200, the reverse zone for the Class C block is 104.243.64.in-addr.arpa. The c.root-servers.net server says that the parent zone (234.64.in-addr.arpa.) is delegated to savvis.net: 243.64.in-addr.arpa. 345600 NS ns1.savvis.net. 243.64.in-addr.arpa. 345600 NS ns2.savvis.net. ns1.savvis.net says that 104.243.64.in-addr.arpa. is delegated to the same servers: 104.243.64.in-addr.arpa. 3600 NS ns1.savvis.net. 104.243.64.in-addr.arpa. 3600 NS ns2.savvis.net. 104.243.64.in-addr.arpa. 3600 NS ns3.savvis.net. If you have a full Class C block (64.243.104.0 - 64.243.104.255), then we now know that the reverse zone is not delegated to you. If you don't have a full Class C block, then Savvis would have to do some flavor of classless delegation to give you control of the reverse zone for your subnet, and there would be one more zone to check. There are a number of choices for what the classless zone could be named, so without knowing its name we can't check the delegation. In any case, Savvis is unlikely to have delegated your reverse DNS to you unless you have specifically asked them to do so, whether it's for a full Class C or some smaller block. > This might explain why NetSol whois reports the secondary servers > before the primary in many of my domain records. Probably not. The order in which NS records are returned, by NSI's or any other name servers, doesn't mean much. Resolvers have no way of knowing if a name server is a 'primary' or 'secondary' and will treat the listed servers equally, querying them all and taking responses from whichever responds the quickest (that's a bit generalized, but mostly the way it happens). The 'primary' and 'secondary' servers should all have authoritative data for any zones delegated to them, so it shouldn't matter what order they're listed in. Christopher Bort | cbort@globalhomes.com Webmaster, Global Homes | webmaster@globalhomes.com <http://www.globalhomes.com/> | PGP public key available on request

Messages In This Thread: secondary server not working on most domains by Robert Burr on Jun 4, 2001 at 3:38:21 pm Re: secondary server not working on most domains by Global Homes Webmaster on Jun 4, 2001 at 4:32:46 pm Re: secondary server not working on most domains by Men & Mice Support on Jun 5, 2001 at 3:57:34 am Re: secondary server not working on most domains by Men & Mice Support on Jun 5, 2001 at 4:02:32 am Re: secondary server not working on most domains by Gary Gleason on Jun 5, 2001 at 9:32:55 am Re: secondary server not working on most domains by Global Homes Webmaster on Jun 5, 2001 at 11:12:40 am