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on 12/12/99 10:27 PM, Aaron Lynch at aaron@DigitalSpeed.com wrote:
Re: Missing A records and slow resolution
From: Kirk Samuelson
Date: Monday, December 13, 1999
Time: 4:48:00 am
> Personall, I've found cnames so problematic, that I just don't use them at
> all.
>
What about them has been problematic for you, Aaron?
> 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.
Hmm. I've found setting up CNAMES to be more convenient for lots of reasons.
I doubt the load difference is of concern unless you are really pushing the
limits on QDNS (the limits are pretty high as I understand it). I'd be
surprised in latency in CNAME lookups was the sole cause of the problem
described below. If only because we don't see any such problem here.
There's the possibility of your A record getting hosed disabling all the
CNAMES that point to it. Other than that I don't see a reason not to use
them. But I'm interested in other perspectives on this.
Anyone else?
-Kirk
>
> 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.
>>
>> 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?
>>
>> Also, what else would cause this problem?
>>
>> jer
>>
>> "On a day no different than the one now dawning, Leonardo drew the first
>> strokes of the Mona Lisa, Shakespeare wrote the first words of Hamlet, and
>> Beethoven began work on his Ninth Symphony." And Windows98 Crashed!
>>
>> Hey, I bought my Apple Stock @ $18, WHO'S LAUGHING NOW!!!
>
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