10-02-2011, 02:30 AM
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Newbie
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Join Date: Sep 2011
Posts: 23
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I've never found a use for more than one IP, but every server I've bought comes with more than one and it's an upgrade feature. So, what the hell are they used for?
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10-02-2011, 02:31 AM
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Junior Guru Wannabe
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Join Date: Jun 2010
Posts: 86
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Extra IPs can be used for various purposes. For example if you are gonna host several websites, you can assign a dedicated for each.
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10-02-2011, 02:35 AM
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Web Hosting Guru
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Join Date: May 2011
Location: Columbus, Ohio
Posts: 256
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Main thing they are used for is SSL's While you can do SSL's that share a IP, many require a dedicate IP address.
Also could be for privacy. There are tools to find what all sites are hosted on an IP. ie, I have a server that I provide hosting on. All "clients" are on one IP, while all my domains are on the server's root IP.
Also, another use could be for nameservers on the same machine.
-Greg
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10-02-2011, 03:41 AM
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Junior Guru Wannabe
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Join Date: Sep 2008
Posts: 80
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Nameserver. You need extra IP for redundancy.
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10-02-2011, 08:33 AM
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Junior Guru Wannabe
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Join Date: Jun 2011
Posts: 49
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Quote:
Originally Posted by sg552
Nameserver. You need extra IP for redundancy.
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While the latter statement in itself is correct, where would redundancy come from when hosting 2 or even more NS on a single machine?
Its definitely not an intended use of more IP-Adresses bound to a server, as its actually bad practice.
In an ideal world Nameservers would be geographically diversed, on different networks - therefore truly meeting the requirement of redundancy by using different IPs.
To the OP: multiple IPs can be useful for binding a smtp on each of them for the correct PTR-Record, as receiving smtp servers could refuse a connection from a server where HELO response and the PTR-Record dont match due to anti-spam policies.
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10-02-2011, 10:19 AM
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Junior Guru Wannabe
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Join Date: Sep 2008
Posts: 80
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Quote:
Originally Posted by mojodoll
While the latter statement in itself is correct, where would redundancy come from when hosting 2 or even more NS on a single machine?
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I should make it more clear than. Multiple IP in different subnets.
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10-02-2011, 10:54 AM
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Premium Member
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Join Date: Mar 2003
Location: Saint Paul, MN
Posts: 817
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Quote:
Originally Posted by sg552
I should make it more clear than. Multiple IP in different subnets.
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Having multiple IPs on different subnets on the same server for DNS is less than pointless. The idea is to eliminate single points of failure, not go out of your way to generate them.
Quote:
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Originally Posted by mojodoll
multiple IPs can be useful for binding a smtp on each of them for the correct PTR-Record, as receiving smtp servers could refuse a connection from a server where HELO response and the PTR-Record dont match due to anti-spam policies.
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And here I thought vanity nameservers were the worst use someone could think of to waste IPs with...
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10-02-2011, 10:57 AM
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We Love Xen® Hypervisor
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vpn, gameserver, ssl, dns....etc.
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10-02-2011, 11:04 AM
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Junior Guru Wannabe
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Join Date: Sep 2008
Posts: 80
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Quote:
Originally Posted by Ankheg
Having multiple IPs on different subnets on the same server for DNS is less than pointless. The idea is to eliminate single points of failure, not go out of your way to generate them.
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I should try to read more that OP is asking for A single server. I was thinking multiple IP in different location.
Last edited by sg552; 10-02-2011 at 11:13 AM.
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10-02-2011, 01:27 PM
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Junior Guru Wannabe
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Join Date: Jun 2011
Posts: 49
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Quote:
Originally Posted by Ankheg
And here I thought vanity nameservers were the worst use someone could think of to waste IPs with...
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Of course, i agree with you on that one, but its the most valid use of an extra ip on a vps i could actually think of, maybe next to multiple vpn connections (which is kind of pointless too).
Legend has it that those PTR checking MX do exist, though i yet have to have any problems with these, my main smtp also doesnt have a "correct" PTR set indeed.
Im having a hard time thinking of possibilities where an additional IP really makes sense on a VPS, when keeping the IP shortage in mind.
Gameservers? you can literally host thousands on different ports, SSL also is not needed.
Oh and i dare any SEO guys to step in here and tell stories about the necessity of different subnets for SEO hosting ;)
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10-02-2011, 01:36 PM
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Web Host Reviewer
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Join Date: Feb 2006
Location: Kepler 62f
Posts: 9,431
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SSL
DNS
"chinese wall" to disassociate IP space
Not SEO. That's myth.
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10-02-2011, 01:44 PM
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Lord of live chats
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Join Date: Jul 2009
Location: UK
Posts: 1,221
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Quote:
Originally Posted by kpmedia
SSL
Not SEO. That's myth.
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+1 for this!
But yea, everyones covered it..
SSL is the "main" reason.
You can host many sites on one ip.. So thats not a major problem.
You can have multiple gameservers on one IP. thats why people use different ports.
SSL is the "main" reason.
You need a separate IP for each SSL site..
The guy who said for "nameservers" is not really correct.
Using multiple IP's on the same server is not resilient!
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10-02-2011, 01:51 PM
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Junior Guru Wannabe
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Join Date: Jun 2011
Posts: 49
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SNI actually makes SSL per IP obsolete - http://en.wikipedia.org/wiki/Server_Name_Indication
One thing came to my mind which requires multiple IPs: vhosting for IRC shell/bnc providers! i wonder if those still exist as they were quite common back in the days.
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10-02-2011, 01:54 PM
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Southern Yankee
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Join Date: Sep 2006
Location: The Not So Deep South
Posts: 923
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Quote:
Originally Posted by mojodoll
One thing came to my mind which requires multiple IPs: vhosting for IRC shell/bnc providers! i wonder if those still exist as they were quite common back in the days.
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Mostly done with IPv6 now since it is a serious waste of IPv4
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10-02-2011, 02:24 PM
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Web Host Reviewer
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Join Date: Feb 2006
Location: Kepler 62f
Posts: 9,431
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Quote:
Originally Posted by lynxus
The guy who said for "nameservers" is not really correct.
Using multiple IP's on the same server is not resilient!
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Well, you can do it. Maybe not smart.
I'll admit to having single point of failure on one of my non-important VPS.
You could also dedicate an IP to DNS, for use as DNS for another server.
I've done that (two VPS, each has DNS for self and other), but not used separate IP.
The extra IP is really just optional. Again, the "chinese wall".
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