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  1. #1
    Join Date
    Oct 2006
    Posts
    323

    Provisioning DNS Correctly

    Hi All,

    I was checking this tutorial and thank the lord I did this all correct before I saw this thanks to all of you here on WHT (you all rock!) but right at the end of the tutorial it talks about setting up PTR dns... what exactly are they for? And are they needed?

    http://www.tyreeonline.com/server_tu...s/dns_host_rp/

    Also does anyone know how to check/configure the reverse DNS settings?

  2. #2
    Join Date
    Jun 2004
    Location
    Bay Area
    Posts
    1,320
    A PTR record is for resolving a domain from an IP. Its kinda like the 'other way arround' from what you would normally do with DNS.

    Example:
    $ nslookup net1.xandrios.net
    Address: 84.16.251.235

    $ nslookup 84.16.251.235
    235.251.16.84.in-addr.arpa name = net1.xandrios.net.

    That second one is the PTR record (In this case maintained by the hoster, since I do not own the IP. Usually one just 'leases' the IP with a server )

  3. #3
    Join Date
    Oct 2006
    Posts
    323
    So do these need to be set up? This is the first time I have read about them...

  4. #4
    Join Date
    May 2001
    Location
    Dayton, Ohio
    Posts
    4,962
    Quote Originally Posted by tomyknoker
    So do these need to be set up? This is the first time I have read about them...
    Normally you need to contact your hosting provider to setup reverse DNS records for your IPs.

    You need to have PTR records for all IPs that send mail for sure, but it's good to have PTRs for every IP.
    -Mat Sumpter
    Director, Product Engagement
    Penton Media

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