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  1. #1
    Join Date
    Sep 2006
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    Cardiff - United Kingdom
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    A newbie question I know, but... what's the need for multiple IPs?

    Hey all,
    I know this is a newbish question, so please play nice

    I've never fully understood what's the need for more than one IP address? I mean, you need one to set-up the nameservers and all, but why do you need more than one?

    </Very newbie question>

    Thanks
    Tristan
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  2. #2
    Join Date
    Jul 2004
    Location
    Memphis, TN
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    1,225
    2 IP's for 2 name servers. Each name server has to have its own dedicated IP.

    Then you need a dedicated IP for a SSL.

    IRC servers..etc etc.

    Quite a few reasons really out there.

  3. #3
    Join Date
    Dec 2007
    Location
    Buffalo NY
    Posts
    363
    Some industries, such as hosting game servers for example, require multiple IP's per machine
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  4. #4
    Join Date
    Feb 2006
    Location
    Kusadasi, Turkey
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    3,273
    But basically for simple hosting (without SSL etc) you usually only need 2 IPs for 2 NS addresses. At least for a newbie
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  5. #5
    Join Date
    Sep 2006
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    Cardiff - United Kingdom
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    Ah okay, thanks all

    I'm still new to all of this, I guess I can't expect to know everything within a few months lol!
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  6. #6
    Join Date
    Oct 2006
    Posts
    330
    You dont need 2 IPs for name servers. It is a very bad practice to keep both name servers on the same box (kinda defeats the whole purpose)

  7. #7
    Join Date
    Jul 2004
    Location
    Memphis, TN
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    But you still need 2 IP's.

    Yes its best to have 2 boxes in 2 different physical locations..but you will need 1 IP per NS.

  8. #8
    Join Date
    Feb 2008
    Posts
    829
    I think really old hosting methods also use 1 IP per virtual host. But with HTTP 1.1 thats not really needed anymore.

    One good use for multiple IPs is if you host VMs. You could get a monster server and put maybe 20 VMs on it then resell the VMs as virtual dedicated servers.

    If you host a mail server you could maybe also use all the IPs so if one gets blocked by RBLs it won't take out your entire server. It will give you a chance to rectify the spam problem and get it unblocked while other customers can still send mail ok.

  9. #9
    Join Date
    Mar 2008
    Posts
    32
    I have one ip and I have pointed both ns1 and ns2 to the same ip, what say?

  10. #10
    Join Date
    Sep 2006
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    Cardiff - United Kingdom
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    Actually I just checked and have done this on my test VPS too, not sure why/how it works?
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  11. #11
    Join Date
    Jul 2004
    Location
    Memphis, TN
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    1,225
    Quote Originally Posted by dhoom View Post
    I have one ip and I have pointed both ns1 and ns2 to the same ip, what say?
    Sure you can do that, but it is not recommended.

    If that one server goes down, then you just lost both primary and secondary DNS servers.

    Ideally, NS1 = 1.1.1.1
    NS2 = 2.2.2.2

    Where both NS's are different physical servers.

  12. #12
    Join Date
    Dec 2000
    Location
    The Woodlands, Tx
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    5,962
    The proper method is at least two nameservers which are on machines seperate machines from all your other stuff, and seperate from each other. If you only have one machine and are running everything from it, you only need one nameserver. Doesnt matter how many you have if you only have one machine. The idea is to have one or more all on seperate servers so if one goes down, your sites are still accessible. It's kinda silly to have two nameservers on the same machine.

  13. #13
    Join Date
    Feb 2008
    Posts
    829
    Nice to have two name servers but what if the actual host server goes down? sure names will resolve but you're still in water. Unless you replicate hosting to two servers as well but it would be impossible to make enough profit that way to pay for two servers for the capacity of one.

  14. #14
    Join Date
    Mar 2008
    Posts
    32
    cheyenne1212 and webdude, Thanks!!! learnt something today!!!

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