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MealstroM
Asked: 2011-06-22 06:39:40 +0800 CST

One server, one external IP, several virtual domains --> one PTR?

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I've got some problem with ptr and domains. Here is situation:

  • external ip: 123.123.123.132
  • domain1: example.com
  • domain2: elpmaxe.net
  • mailserver is on exim4.
  • PTR 123.123.123.123 matches example.com

How should I set the PTR for the second domain? How this is solved in web-hosters/vps/? Should I have another external IP for that?

domain-name-system email exim domains ptr-record

1 Answers

  1. Best Answer

    PTR records are mostly used for mail purposes, in order to establish some level of credibility when mail is received from another server. Therefore, for a server that hosts a mail service, they should resolve to the IP address of the MX record for that server. They are not needed for websites. All modern web servers can handle name based virtual hosts, where any number of websites can share a single IP address (on HTTP).

    The picture changes when you start to use HTTPS. One limitation of that protocol is that you need to have a separate IP address for each HTTPS website.

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