Bind: adding DNS entries

noir911 · 10-03-2008, 12:01 AM

Is it possible to add a different MX record for a sub-domain when the MX record for the domain is already defined?

I got:

Quote:

$origin domain.com
@ mx 10 mx1.it.domain.com.
mx 20 mx2.it.domain.com.

just under this I defined:

sandbox1.test a 203.10.77.98
sandbox2.test a 203.10.77.95
test.domain.com mx 10 sandbox1.test.domain.com.
test.domain.com mx 20 sandbox2.test.domain.com.

So when people type: host -t mx test.domain.com. the get the output: sandbox1.test.domain.com. and sandbox2.test.domain.com.

Is this going to work?

Thanks.

trickykid · 10-03-2008, 02:57 PM

I'm confused by your question actually? You want them to see both MX records? That's by default really. Clearly from what you've provided, you have a primary MX host and the secondary if the first one is unreachable. Your secondary MX host should be configured to hold email until the first one is available again.

noir911 · 10-03-2008, 03:53 PM

Quote:

Originally Posted by trickykid

I'm confused by your question actually? You want them to see both MX records? That's by default really. Clearly from what you've provided, you have a primary MX host and the secondary if the first one is unreachable. Your secondary MX host should be configured to hold email until the first one is available again.

Sorry for being confusing. I'm testing a new sub-domain with a new MX record. But there seems to be no way to tell Bind to point to the new MX record (it is still pointing to the old one). ie. if I try "host -t mx <whatever>.domain.com", it points to my old mx.

Do you know why this is happening and how to change that?

Thanks.

Mr. C. · 10-03-2008, 09:26 PM

What you are doing is correct. Did you update the serial number and reload bind?

noir911 · 10-07-2008, 06:57 PM

Not sure if this would help but following is a part of my domain.com file

Code:

$origin domain.com.
@               ns      ns1.domain.com.
                ns      ns2.domain.com.
                mx      10     jafar.domain.com.
                mx      20     yoda.domain.com.
;
staff           mx      10     jafar.domain.com.
                mx      20     yoda.domain.com.
*               mx      10     jafar.domain.com.
*               mx      20     yoda.domain.com.

The following is added by me

mx1             a       203.10.77.192
mx2             a       203.10.77.183

sandbox1.test     a  203.10.77.98
sandbox2.test     a      203.10.77.95
test.domain.com    mx 10       mx1.domain.com.
test.domain.com    mx 20       mx2.domain.com.

If I do "host -t mx test.domain.com" it's still pointing to jafar.domain.com. and yoda.domain.com. And, yes, I have update the DNS serial and restarted bind.

Thanks for any help.

Mr. C. · 10-08-2008, 12:18 AM

One would typically use @ instead of * in the hostname field of the MX record:

Code:

@               mx      10     jafar.domain.com.
@               mx      20     yoda.domain.com.

This would indicate that all mail for the current ORIGIN (domain.com in this case) would be MX'd to jafar and yoda. * is the anything wildcard.

noir911 · 10-08-2008, 01:19 AM

Quote:

Originally Posted by Mr. C.

One would typically use @ instead of * in the hostname field of the MX record:

Code:

@               mx      10     jafar.domain.com.
@               mx      20     yoda.domain.com.

This would indicate that all mail for the current ORIGIN (domain.com in this case) would be MX'd to jafar and yoda. * is the anything wildcard.

Thanks for your suggestions. Is there any way I can get my new MX's to test my sandbox without changing the *'s? I want to leave the *'s the way they are.

Mr. C. · 10-08-2008, 01:31 AM

Do you notice you are missing periods at the end of your domain names:

Code:

test.domain.com    mx 10       mx1.domain.com.
test.domain.com    mx 20       mx2.domain.com.