Unable to ping MAIL host on W2K DNS Server

Posted on 2005-04-07
Last Modified: 2010-03-18
I have a W2K DNS server on the internet. I can ping,, etc. That all seems to respond just fine. I entered an MX record and called it and put the IP address of a sendmail Linux fedora box I am using to test some work. All the FQDNs I listed above go to this same Linux box.

I can ping the other host names, I can ping by IP address, I CAN NOT PING BY NAME TO "".

I made sure it WAS an "MX" record.

I tried little things like making sure the firewall was temporarily taken down to test between these boxes if the ping went through. But whenever I try to ping I get an Unknown host error. No error when I type ping,, etc. I entered another A record, and I can ping that.

I have cleared the cache on my internal DNS, and run ipconfig /flushdns on my client windows machines.

I even get Unknown host error when I trying to ping FROM THE DNS SERVER!

Yet I see the darn recording in the domain folder for the domain in question, pointing to the IP address (also tried pointing the MX record to another host name that leads to the same Linux box)

I have run nslookup on the windows and Linux machines and tried to get it to tell me the IP of and get *** Can't find No answer or NOTHING on the windows machine.

I either don't know something, or I forgot something I knew once.

Question by:gplemos071400
    LVL 70

    Accepted Solution


    MX Records should be: IN MX

    Then the A Record for the mail server... IN A <IP Address>

    Using IPs in MX Records disagrees with certian RFCs... I can probably find it if you want.

    If your MX is IN MX... Then you're trying to tell it to recieve mail sent to the domain (that is to your sendmail IP.
    LVL 70

    Expert Comment

    by:Chris Dent

    RFC 974 and 1035. It's fun reading... honest...

    Author Comment

    Thanks!  But hey, I am not reading RFC's unless they put a gun to my head :-)

    That was enough info for me to think -- I then just needed to review something in my minasi windows server book, and that got it straightened out.

    Thanks for the help and memory slap!
    LVL 70

    Expert Comment

    by:Chris Dent

    Can't say I blame you.. RFCs are a bit heavy ;)

    Glad it helped anyway :)

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