Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm using a very powerful dedicated server :-D and it's got a whole range of external IPs.

I've got my DNS (cloudflare) pointing to the first, primary IP. But I can access the server from any of the IPs in the range.

Is there any benefit to setting up additional A records for my domain to point to the other IPs, or actually is there any detriment to this?


share|improve this question
up vote 3 down vote accepted

The most important use of multiple IP addresses per physical machine today (in my view) is the ability to create virtual machines on the host with its own IP addresses, but there might be other benefits as well, like if you can't use SNI for HTTPS and still want to use more than one vhost on the machine.

share|improve this answer
So are you saying with only 1 IP address, I couldn't host more than 1 website? I'm certain I can define several vhost configs, and have the DNS point all domains at the 1 IP, then the vhost configs would handle which directory/website is served up based on the domain the incoming request is coming from? – i-CONICA Mar 28 '14 at 11:33
Yes, but that's not working with HTTPS without SNI. – Sven Mar 28 '14 at 11:40
@SvW To be more precise you can't have multiple https sites using different certificates on a single IP without requiring SNI (Server Name Indication). Multiple sites with a single wildcard cert or a SAN (Subject Alternative Name) cert which matches all of the site names would also work on a single IP. – Håkan Lindqvist Mar 30 '14 at 19:37

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.