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  1. #1
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    Do you need an additional IP address?

    I think this is a common question that comes up for many VPS consumers and consumers often think they need an additional IP when they do not. The most common issue is because of NS2 or one SSL site but I will go through the basics.

    Do you need a dedicated IP for your nameserver?
    No, you do not need a dedicated IP for nameservers. One IP address can be used for many things, including hosting both web sites and nameservers.

    Do you need an additional IP for NS2?
    No. This is a common myth, there is absolutely no point to having a second IP for NS2 if both IPs are on the same virtual server. The only reason two IPs are to be used is for redundancy, hence they are supposed to be hosted on two different servers in two different datacenters.

    If both IP addresses are on the same virtual server and that virtual server goes offline, both nameservers will be offline, hence no redundancy is given.

    You can assign the same IP address for both NS1 and NS2 if you are just hosting off of one VPS.

    Do you need a dedicated IP for SSL?
    The first SSL certificate, no. Each one after, yes. You can run the first SSL site off of the same IP as other web sites, as long as you only need one SSL web site. For every SSL web site thereafter, you will need to have a dedicated IP.

    SNI, or Server Name Indication, removes the requirement for dedicated IPs, but currently Windows XP and some older operating systems do not support it, although you should definitely look into implementing it in the near future as both IPv4 space and Windows XP users are rapidly declining.

    You have multiple web sites, one SSL web site, and want to host your own nameservers on a single VPS, how many IP addresses do you need?
    Just the one. The one IP can be used for both nameservers, the first SSL certificate, as well as multiple non-SSL web sites.

    Will multiple IPs in different class C (/24) blocks help my SEO ranking?
    Not noticeably. This is an old fashioned way of committing SEO practices and is now-a-days a myth that many companies use to get extra money from their IP space. This will not help for any of the popular search engines and should be frowned upon especially with the lack of IPv4 space.

    Hope this guide helps you save money and contributes to some conservation of the limited IPv4 resources.
    Last edited by devonblzx; 11-20-2012 at 12:28 PM.
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  2. #2
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    One of the best FAQ I have seen in a long time, nice work!
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  3. #3
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    Quote Originally Posted by devonblzx View Post
    Do you need an additional IP for NS2?
    No. This is a common myth, there is absolutely no point to having a second IP for NS2 if both IPs are on the same virtual server.
    Unfortunately, some registrars require both nameservers to have different IP addresses, which is really dumb I know.
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  4. #4
    VERY VERY Nice Thread. This can help a lot of noobs to setup things. Good Work Sir.
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  5. #5
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    Quote Originally Posted by gigatux View Post
    Unfortunately, some registrars require both nameservers to have different IP addresses, which is really dumb I know.
    Portugal is the only one I know of with this antiquated requirement, what others are known?
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  6. #6
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    Portugal is the only one I know of with this antiquated requirement, what others are known?
    .de and .be

  7. #7
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    Quote Originally Posted by gigatux View Post
    Unfortunately, some registrars require both nameservers to have different IP addresses, which is really dumb I know.
    I have seen that, and in that case I would recommend the user use two servers or hosted DNS. Hosted DNS is usually a better solution anyways as it is usually redundant, although sometimes the automation is not there.

    The vast majority, however, try to fulfill this requirement even though they have no need for a second IP.
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  8. #8
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    Quote Originally Posted by gigatux View Post
    Unfortunately, some registrars require both nameservers to have different IP addresses, which is really dumb I know.
    Exactly, we explain to customers they dont need a second IP for their NS2 but most of the time they understand that but their Registrar requires a different IP which is really dumb, and what I have found in common between the Registrar that requires this is that they are all the ones that are old, using an old interface and just out of the game or a third party registrar.

  9. #9
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    The Registry for .PT ccTLD requires this for redundancy, as you could see at the Technical Conditions in the Rules for .PT Domains:

    Technical Conditions

    For a domain to be assigned in the .pt zone it must be technically associated to a primary name server that is correctly installed and configured, in order to ensure an authoritative response to the domain being registered.

    Redundancy of the DNS service must also be ensured by simultaneously configuring one or more secondary servers, which should preferably be located in different buildings, not using the same local network.

    The servers should be configured in accordance with the parameter rules established in RFCs 819, 920, 874, 1032 to 1035 and 1101, as well as in any other current or future documents that are applicable in this context.

    The registration of domains simply for the purpose of reserving an associated name does not require any technical data.
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  10. #10
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    Quote Originally Posted by devonblzx View Post
    Will multiple IPs in different class C (/24) blocks help my SEO ranking?
    Not noticeably. This is an old fashioned way of committing SEO practices and is now-a-days a myth that many companies use to get extra money from their IP space. This will not help for any of the popular search engines and should be frowned upon especially with the lack of IPv4 space.
    I know I'm always on about this one, but it's really just another thing on the checklist it's easier to do than not do. It doesn't rank up there with url/title/headers/density obviously, but for an extra almost-dollar I'd really rather my domains stand on their own rather than risk some other schmoe doing some dirt and having it spill over on me.

    Plus, hell, it's the first thing they look for when you're doing interlinking shenanigans.
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  11. #11
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    Quote Originally Posted by Colo To America View Post
    I know I'm always on about this one, but it's really just another thing on the checklist it's easier to do than not do. It doesn't rank up there with url/title/headers/density obviously, but for an extra almost-dollar I'd really rather my domains stand on their own rather than risk some other schmoe doing some dirt and having it spill over on me.
    It doesn't work that way.
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  12. #12
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    Quote Originally Posted by kpmedia View Post
    It doesn't work that way.
    Well, it does if a phishing site is hosted on the same IP as yours and an upstream provider decides to null route that IP.
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  13. #13
    Quote Originally Posted by gigatux View Post
    Unfortunately, some registrars require both nameservers to have different IP addresses, which is really dumb I know.
    I don't think it's dumb. Two separated nameservers are for reliability.

    Imagine the primary is down for some reason and if you share single machine for both NS-es your serivce is't available even if your server is up and running due to missing DNS.

    Delegating DNS to some third-party (your registar for example) is a reasonable and safe option I would suggest.
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  14. #14
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    Quote Originally Posted by cieslakd View Post
    I don't think it's dumb. Two separated nameservers are for reliability.
    It seems like you've missed some of the other points in this thread. We all agree with the reliability point, but to enforce it just results in lots of people requiring additional IPs (running on on the same VPS) to fulfil this requirement.

    Or, what about a single IP address that fails over automatically in a data centre, or even across multiple data centres?

    I stand by my statement that enforcing this rule is dumb.
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  15. #15
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    Some control panels (not the best designs?) might preclude use of the primary IP address for an SSL cert, requiring that the first cert added be on a second IP.
    For nameservers, IMO the requirement for separate IP/server starts to make more sense once the nameservers are entirely separate from the web server, preferably in different DC. Ideally neither on the same physical box as the web server for any domains served, with full fail-over as well, but that gets expensive/complex.
    As others have said, it should be individual choice to accept the reliability compromises of running everything on one box/IP.
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