On Feb 25, 2013, at 1:45 PM, Radu Anghel wrote:
On Mon, Feb 25, 2013 at 6:06 PM, aurfalien aurfalien@gmail.com wrote:
Hi,
Has any one had problems with mail clients were your DNS is like this;
doman.com MX 50 mail.domain.com domain.com MX 100 mail2.domain.com
domain.com CNAME www.domain.com
Hello,
You can't mix CNAMEs with other record types.
The whole domain name can't be defined as a CNAME even if you don't add any A/MX records to it because it *must* have NS records.
With BIND you can't even load a zone file defined like you suggested. named-checkzone complains:
dns_master_load: domain.com.zone:14: domain.com: CNAME and other data zone domain.com/IN: loading from master file domain.com.zone failed: CNAME and other data zone domain.com/IN: not loaded due to errors.
Interesting read: http://tools.ietf.org/rfc/rfc1912.txt pages 5/6 for CNAMEs.
Usually you should use something like:
domain.com IN NS dns.server.com. domain.com IN NS other.dns.com.
domain.com IN A x.x.x.x www.domain.com IN CNAME domain.com.
domain.com IN MX 5 etc
AFAIK, SSL certs for www.domain are also valid for domain by default so that shouldn't be a problem.
Cool info.
I ended up mixing A, MX and NS records but not CNAMEs.
All seems to work although I am waiting for breakage, giving it another day or 2 b4 updating our external DNS. Internal is quick to update so its easy to manage.
- aurf