CNAME question
Brad Knowles
brad.knowles at skynet.be
Fri Jul 27 01:39:02 UTC 2001
At 8:06 AM +0700 7/27/01, viet anh wrote:
> vietanh.com IN SOA dns.domain.com mail.dns.domain.com
> (
Won't work. The open parenthesis character must be the last
thing on the line above.
> My question here is that: is there any problem if I
> add only CNAME record after NS record.
> File vietanh.com.dns will like that:
> vietanh.com IN SOA dns.domain.com mail.dns.domain.com
> (
> 20010725;
> 86400;
> 86400;
> 3600;
> 3600000;)
> vietanh.com IN NS dns.domain.com.
> vietanh.com IN CNAME www.isp.com.
Nope. Won't work.
> Because as my knowlege, the CNAME record can't exist
> with any record.
That's right. Now, you could CNAME www.vietanh.com to something
else, but that's a different matter.
Oh, and make sure you either use unqualified names (don't include
the domain name), or place a trailing dot at the end of the FQDNs,
because you don't want:
vietanh.com IN NS dns.domain.com.
To be mis-interpreted by BIND as:
vietanh.com.vietanh.com IN NS dns.domain.com.
> one computer will have only IP address and one name.
> if I want this copumter have another name I have to
> declare CNAME record in DNS that point to the first
> name of this computer.
You could do that, yes.
> But I have a problem with mail
> exchanger ( my domain have CNAME and MX record). I
> want to replace CNAME record by A record, so one ip
> address will have two A record, for example:
> mail.vietanh.com IN A 10.0.0.1
> mail.isp.com IN A 10.0.0.1
> I wonder if my dns system work
> correctly.
Yup, that should work just fine. Of course, you want to make
sure that you use real IP addresses. ;-)
> As DNS administrator, if I declare like that, what
> problem I have to take care?
> ( at this time, declare like that, it will work fine)
> I am looking forward to have your answer.
The one thing to watch out for is the reverse DNS configuration
for this IP address. You should decide which name you want everyone
in the world to see when this machine connects out to others in the
world, and make that the one name you list in the reverse DNS file
for this IP address. Don't list more than one name for the same IP
address, because most applications either ignore the extra
information or do not function correctly.
--
Brad Knowles, <brad.knowles at skynet.be>
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