Search Again: Re: Missing A records and slow resolution From: Men & Mice Support Date: Monday, December 13, 1999 Time: 4:44:00 am At 8:27 PM -0800 12/12/99, Aaron Lynch wrote: >Personall, I've found cnames so problematic, that I just don't use them at >all. > >AFAIK it's perfectly ok to use multiple A records for a host, so the way I >see it, if a client requests a host which is a cname then it has to also find >out about where the c name points. so in the best case, if everything works >perfectly, a cname doubles the load on the server. I just don't get why >you'd wanna do this : ) > >my suggestion is to make then all a records, unless somebody else might have >a compelling reason not to do this. It's mostly just a matter of easy maintenance vs speed. CNAME's if used carefully, can make it easier to maintain large numbers of names, especially if you ever have to change an address. >Mia's Virtual Post Office wrote: > >> Hello, I have a new colo customer that has about 30 or so domains that he >> transferred here. We changed the NS records to reflect our Name Servers >> and the new InterNIC info, etc. The customer, as well as some of his >> customers are complaining of latency or difficulty in getting to their >> site/s. >> >> At first I thought this was a Web* VHosts problem, (though I think VH may >> still be causing some problems as it takes Web* on this machine about 5 >> minutes to startup) but after looking at all the Zone files he emailed >> us, I noticed that most have no A Records. >> >> I also ran DNS Expert on some of the domains an it reported it couldn't >> find the authoritative DNS server for the domain. This is likely the problem. DNS Expert's analyzer uses the same basic algorithm that a TCP/IP stack's DNS resolver uses. Use the DNS Query tool to trace the delegation, looking for servers that should be authoritative but don't claim to be. (Note that delegation records are reported as non-authoritative.) >> I think the problem may stem from the fact that there is no A record for >> most of these domains, just CNAMEs. Is there an RFC that stipulates the >> need for A records? No. >> Also, what else would cause this problem? Any number of things. Most likely, delegation problems. ____________________________________________________________________ Chris Buxton cbuxton@menandmice.com Men & Mice http://www.menandmice.com Makers of: QuickDNS Pro

Messages In This Thread: Missing A records and slow resolution by Mia''s Virtual Post Office on Dec 13, 1999 at 4:05:00 am Re: Missing A records and slow resolution by Aaron Lynch on Dec 13, 1999 at 4:27:00 am Re: Missing A records and slow resolution by Men & Mice Support on Dec 13, 1999 at 4:44:00 am Re: Missing A records and slow resolution by Kirk Samuelson on Dec 13, 1999 at 4:48:00 am Re: Missing A records and slow resolution by Dale Therio on Dec 13, 1999 at 9:48:00 am Re: Missing A records and slow resolution by Men & Mice Support on Dec 13, 1999 at 10:43:00 am Re: Missing A records and slow resolution by Dale Therio on Dec 13, 1999 at 12:52:00 pm Re: Missing A records and slow resolution by Mia''s Virtual Post Office on Dec 13, 1999 at 5:34:00 pm Re: Missing A records and slow resolution by Men & Mice Support on Dec 13, 1999 at 11:26:00 pm Re: Missing A records and slow resolution by Mia''s Virtual Post Office on Dec 13, 1999 at 11:44:00 pm