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Thread: having multiple IP addresses?

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    having multiple IP addresses?

    Hi, you know when you buy a hosting service from some companies, they can give you multiple IPs?

    How exactly does that work? I thought it was one IP per internet connection.

    My question is specificaly in regards to gameservers, where instead of using one IP with multiple ports (xx.xx.xx.xx:1234 is one game, xx.xx.xx.xx:4321 is another game running on the same box); they can have multiple IPs all going to the same box??
    Last edited by latrosicarius; 15-11-2008 at 09:45 PM.

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    Re: having multiple IP addresses?

    Servers can often have many, many separate IP addresses.

    Once you start getting into setting up hosted servers there is usually many different ways to do thing. For instance, it's possible for a shared web server to have an IP for each 'site' or domain hosted on that. However, you can also configure things so that pne physical server has just one IP and each hosted domain is available on that one IP.

    With game servers, perhaps xxx.xxx.xxx.xxx is one physical server and you have port 1234, someone else will have port 5678. Then the server for a different game will be on yyy.yyy.yyy.yyy which could be in a completely different rack (or even data center), again you have port 1234 with someone else on port 5678.

    Just some of the many ways TCP/IP can be configured. It really is a very flexible (if slightly flawed) protocol.

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    Re: having multiple IP addresses?

    It's known as multihomed, and yes, you could have a different IP to host each game.

    If it's all works fine on separate ports though it's a bit of a waste of an IP.

    The main use for having multiple IPs in a hosting environment is to host separate SSL websites - using SSL you cannot use virtual hosting by domain name.

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    Re: having multiple IP addresses?

    Like the above I use mne for SSL sites such as webmail login etc.
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    Re: having multiple IP addresses?

    thanks for the info. is there anything i can do to set it up, or is it just done by my ISP?

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    Re: having multiple IP addresses?

    Quote Originally Posted by latrosicarius View Post
    thanks for the info. is there anything i can do to set it up, or is it just done by my ISP?
    When your ISP or hosting provider issues you with your network IP range, you set aside 3 for raw networking (network, gateway, and broadcast addresses). Think of it in terms of a local private network, 192.168.0.0/24 (or network mask of 255.255.255.0) for e.g., 192.168.0.0 is the network address, 192.168.0.1 is typically the gateway address, and 192.168.0.255 is the boardcast address. Then you assign the rest to your network interface cards or virtual network interfaces, once you've done that you set whatever daemons you have to open listening ports on whatever IP address you want, how that is done varies between software. Although in many managed hosting environments you don't get a sub-ip pool but rather you're provided IPs from a larger pool so you don't lose 3 IPs to deal with IP address space.

    If none of that makes sense to you, then you probably don't need multiple IPs. It's mostly useful for providing virtual machines/containers, or multiple physical servers with distinct and publicly accessible IP addresses.
    Last edited by aidanjt; 15-11-2008 at 11:20 PM.
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    Re: having multiple IP addresses?

    Quote Originally Posted by latrosicarius View Post
    thanks for the info. is there anything i can do to set it up, or is it just done by my ISP?
    They have to be allocated by your ISP (usually at a cost) You cannot set up anything until that is done.
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    Re: having multiple IP addresses?

    cool i asked my ISP and they said they can give a block of 5 static IPs for an extra 20 USD per month

    thanks for the info everyone

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