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"A" Record & MX Record

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"A" Record & MX Record - 4.Apr.2008 3:19:20 PM

bozard

Posts: 24
Joined: 11.Oct.2006
Status: offline

This might seem stupid but I need to be very certain before I commit.

If I have the MX record pointing to the Edge server on the DMZ (which is Nated on the PIX) Do I need to have the "A" record pointing to the same IP? Or can I point the "A" record to a different public IP that is Nated on the PIX to the Client Access Server inside the network?

I also need to be certain that this will work with my other Client Access Server at another location using the proxy method since it isn�t internet facing...

(Will this all work with Active Sync?)

What�s the verdict?

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RE: "A" Record & MX Record - 4.Apr.2008 3:41:40 PM

John Weber

Posts: 608
Joined: 20.Apr.2005
From: Portland, Oregon
Status: offline

mx points to a record.
a record = name = ip.

bring 25, 80, 443 to a record.
PIX (variety of methods) NATs that IP to the Edge or HT.

25 to edge/ht
80/443 to CAS.
80 is optional.

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(in reply to bozard)

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RE: "A" Record & MX Record - 4.Apr.2008 3:54:07 PM

bozard

Posts: 24
Joined: 11.Oct.2006
Status: offline

But can i do the mx record to the edge with one IP, and the "A" record to another IP?

In other words what i stated in the begining, is this possible?

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RE: "A" Record & MX Record - 4.Apr.2008 9:04:13 PM

t0ta11ed

Posts: 274
Joined: 2.Feb.2007
From: Mars
Status: offline

Typically you don't point an MX to an IP, you point it to the name, then a corresponding A record points to the IP. Perhaps I'm missing something here, but I've never configured MX records to point to an IP.

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RE: "A" Record & MX Record - 11.Apr.2008 7:09:52 PM

jhp

Posts: 2
Joined: 11.Apr.2008
Status: offline

As t0ta11ed says,

1. Create an A record for the IP address of your edge transport server
2. Point your MX record to the A records of the edge transport server
3. Create a PTR record for your edge transport server for good measure
4. Create a TXT record for your mail domain (s)

http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/

5. Create an A record for your CAS Server

You can check your setup for common DNS problems using www.dnsstuff.com

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http://www.Active-Office.co.uk

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Post #: 5