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Thread: Basic IP address questions

  1. #1
    VPS_Newbie is offline Forum Member
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    Default Basic IP address questions

    I signed up for the basic Windows VPS package, W-VPS-01, some time ago - just to learn. I'm struggling to understand the IP address provision. Any insight gratefully received!

    The W-VPS-01 has 2 IP addresses. The IP addresses management section of the Plesk Control Panel shows that one is 'Shared' and one is 'Exclusive'. What is the significance of this? Is it just a business/marketing decision by the company? Or are there accepted functions for these IP addresses? What would be the normal function for each address type?

    A radio button on the Plesk control panel looks like it would enable me to set the shared address to exclusive and vice-versa. How can this be? If I'm sharing one address with others, how can I make it exclusive? (I haven't touched it at this point!)

    The Private Nameserver information shows that the last 2 digits of each nameserver parallel the last two digits of the IP addresses. Is this significant? Is there software on my VPS to act as name resolvers? Do people linking to any site I've got actually connect to the VPS for name resolution? Or does eUKHost have a big server that resolves all? Are the matching names of no significance? Furthermore, the Private Nameserver Information section of my setup receipt shows the Exclusive IP address under 'IP Address Allocation'. What is this?

  2. #2
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    Quote Originally Posted by VPS_Newbie View Post
    I signed up for the basic Windows VPS package, W-VPS-01, some time ago - just to learn. I'm struggling to understand the IP address provision. Any insight gratefully received!

    The W-VPS-01 has 2 IP addresses. The IP addresses management section of the Plesk Control Panel shows that one is 'Shared' and one is 'Exclusive'. What is the significance of this? Is it just a business/marketing decision by the company? Or are there accepted functions for these IP addresses? What would be the normal function for each address type?

    A radio button on the Plesk control panel looks like it would enable me to set the shared address to exclusive and vice-versa. How can this be? If I'm sharing one address with others, how can I make it exclusive? (I haven't touched it at this point!)
    In Plesk control panel, dedicated IP addresses are referred to as Exclusive IP addresses. After installation, Plesk reads all your IP addresses from the network configuration files and can then use these IP addresses for hosting DNS domains and Web sites..

    Here is how you can access the IP Address Management page where you can add and remove IP addresses, refresh the list of IP addresses, and edit the IP address properties:

    1. Login to your Plesk Control Panel as admin user.
    2. Click on Server from the navigation bar on the left.
    3. Click the IP Addresses icon.
    4. You will now see the list of available IP Addresses on the server.


    An icon in the S (Status) column shows if your IP address is properly configured on the network interface. If your IP address was removed from the network interface, an icon will show a red exclamation mark.

    An icon in the T (Type) column shows if an address is dedicated to a single client as an exclusive IP address, and if an IP address is shared among many clients.

    The IP address, Subnet Mask and Interface columns show the network interface of the respective IP Address and its subnet mask.

    The Clients column shows the number of clients (user accounts) who you have assigned an IP address to. To view the clients by names, click the respective number in the Clients column.

    The Hosting column shows the number of websites hosted on an IP address. To view the domain names of these websites, click the respective number in the Hosting column.

    By default, each VPS server plan is assigned with one IP address. You can sign up for additional IP(s) during initial server setup or later by getting in touch with our Billing Dept.

    With Plesk you can mark all your IP addresses as shared or dedicated before you assign them to your customers. This allows the control panel to distinguish between them and not to let you assign a dedicated IP address to several customers at once.

    A dedicated IP address can be assigned to a single customer, while a shared IP address can be shared among several user accounts. That is the main difference between a shared IP & a dedicated/exclusive one.

    Note that SSL protection with authentic digital certificates and Anonymous FTP services are available only to dedicated hosting accounts on a dedicated IP address. Shared hosting accounts can also have SSL protection, but visitors to such protected sites will get error messages in their browsers.

    Quote Originally Posted by VPS_Newbie View Post
    The Private Nameserver information shows that the last 2 digits of each nameserver parallel the last two digits of the IP addresses. Is this significant?
    No, private name servers can be setup to any other name in pair, eg. xn3.domain.com & ns5.domain.com, or anything else, but they need to be pointing to the server for name resolution. The last 2 digits of the IP address & the name servers being similar is a mere coincidence.

    Quote Originally Posted by VPS_Newbie View Post
    Is there software on my VPS to act as name resolvers?
    You have Plesk control panel installed on your VPS, which itself has Bind [Berkeley Internet Name Domain] bundled with it. Bind is used by the control panel for name resolution, so you don't have to install any more applications for the same.

    Quote Originally Posted by VPS_Newbie View Post
    Do people linking to any site I've got actually connect to the VPS for name resolution?
    If you are going to host domains on your VPS, you need to have their name server records changed at the domain registrar level, with the ones provided in the welcome email.

    Quote Originally Posted by VPS_Newbie View Post
    Or does eUKHost have a big server that resolves all?
    The name server records we provided in the welcome email will be responsible for domain resolution, you can check that by pinging the private name servers from your local machine, they'd point to your VPS's IP address.

    Quote Originally Posted by VPS_Newbie View Post
    Are the matching names of no significance?
    Yes, the matching names are for accountability purpose only, if you want to have your own name servers [eg: xx1.your-domain.com & xx2.your-domain.com], you can have them registered & setup for your domains.

    Quote Originally Posted by VPS_Newbie View Post
    Furthermore, the Private Nameserver Information section of my setup receipt shows the Exclusive IP address under 'IP Address Allocation'. What is this?
    Any non-shared IP address, is an exclusive one or a dedicated one. The IP Address Management function of Plesk enables the administrator of the server to control the available IP Addresses on system network interfaces. This function is designed specifically for servers that have more than one IP address or more than one network interface.

    I hope I've explained the differences & basic roles they play in my first reply..

    For a domain [eg. some-name.co.uk] to work from your VPS, please follow these simple steps:

    1) Login to the domain registrar control panel of some-name.co.uk.
    2) Change the name servers to the ones we provided in the welcome email [eg. ns2xx7.uk.com & ns2xx8.uk.com].
    3) Login to your Plesk control panel & add some-name.co.uk under your account as a physical hosted domain.
    4) The website some-name.co.uk would start working once the DNS [in step 2] changes propagate


    Hope this is useful.. please let us know if you have any further questions..

    Rock _a.k.a._ Jack
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  3. #3
    VPS_Newbie is offline Forum Member
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    Rock, thanks a lot! That clears up some fundamental misunderstandings. I'll read the manuals/support articles and come back with any further queries.

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    Quote Originally Posted by VPS_Newbie View Post
    Rock, thanks a lot! That clears up some fundamental misunderstandings. I'll read the manuals/support articles and come back with any further queries.
    You're most welcome

    Rock _a.k.a._ Jack
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  5. #5
    VPS_Newbie is offline Forum Member
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    Reasons to be cheerful….Part 2….

    Nameservers! Aaaaaarrrrgggggghhh!

    Let me try to summarise my understanding:

    I have a Windows VPS package with eUKhost. This provides 2 IP addresses:
    XXX.XXX.XXX.XX1
    XXX.XXX.XXX.XX2

    Also, per the welcome email:

    PRIVATE NAMESERVER INFORMATION:
    mybit1.eukhostbit.com
    mybit2.eukhostbit.com
    IP address allocation:
    XXX.XXX.XXX.XX2

    Question. I'm not a network geek, but I pinged the nameservers per Rock's suggestion above and sure enough, the first one found the first IP address and the second one found the second IP address. So why does the welcome email list only the second IP address in the nameserver section?

    Setting Up Nameservers
    Suppose I buy a new domain - newdomain.com - from 123-reg. Let me try to understand the options for name resolution.

    1) Use Registrars Nameservers.
    I provide 123-reg with details of my IP address for the domain and it's nameserver points all traffic to this IP address. Straightforward. But in setting up my domain, Plesk will have created nameserver stuff (for BIND in my VPS) based on the default template settings. Does it just sit isolated, waiting for work, but with nothing pointing to it? Is this a needless overhead/security risk? Do I need to select 'Switch Off The DNS Service'?

    2) Use 'Private Nameservers' Provided In Welcome Email
    Here I need to provide 123-reg with the nameservers provided in the welcome email. These seem to be of the form mybit.eukhostbit.com. I'm assuming that 123-reg nameserver would resolve down to the 'eukhostbit' and pass resolution on to that eukhost nameserver which then resolves down to mybit. It then passes the resolution task to the BIND nameserver in my VPS which points to my IP address?

    3) Use Nameservers Which Include My Domain Name
    This is where I really get confused. Firstly, the expression 'Private Nameserver' is not rigorously used on the web, or even by eUKhost. The welcome email lists mybit1.eukhostbit.com and mybit2.eukhostbit.com under the 'Private Nameserver Information' heading. However, this link:

    [edit: can't post a link until I've made 5 posts! ]

    states that: 'Private name servers are the name servers which includes your own domain name, Private name servers would be ns1.mydomain.com and ns2.mydomain.com'.

    The welcome email says that 'If you want the DNS to be the same as your domain name … then you would have to register the DNS from the same registrar....'
    I'm lost at this point. Do I really have to 'register' the nameservers like originally registering the domain? Or do I just provide the nameserver information as I might have entered mybit1.eukhostbit.com and mybit2.eukhostbit.com in the nameserver fields in the 123-reg configuration? If so, how do I make ns1.newdomain.com (and ns2..) my nameservers? Am I supposed to be able to configure this in Plesk? Or do I have to raise a support ticket to eUKhost to have this set up manually? Does eUKhost just redirect ns1.newdomain.com to mybit1.eukhostbit.com and ns2.newdomain.com to mybit2.eukhostbit.com so the process can proceed as in 2 above?

    In various places on the web, people talk about setting up nameservers based on your 'main' domain. Is 'main' of any significance. Is there some configuration in Plesk that makes one domain the main one? Or can you just choose any one you like?

    Apologies that this is a bit rambling and I know that some of it is probably rubbish, but I need to get it clear. Many thanks.

  6. #6
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    The Welcome Email provides you the complete account information. You receive the information for your Hosting Account Information, RDP Information, Billing Area, Name Servers, IP address allocation and other useful information.

    IP address allocation :: You see only one IP address under this subject because you are allotted 2 IP addresses for your VPS, the first IP address is the main VPS IP address and the second IP address which you see under IP address allocation is the IP added and assigned to your VPS. Both this IP addresses are private to you. If you purchase additional IP addresses, then you should see the additional IP addresses under this information.

    Click on the link below for detailed information on Name Servers.

    What is a Name Server?

    If you register a domain name and wish to have the name servers to be set using your domain name, then the name servers have to be first registered at your Domain Registrar. The name servers can only be registered from where the actual domain name is registered.

    The Private Name Server in the Welcome Email provides you two Name Servers and these name servers are registered by us only for you as these names have your VPS IP address binded to it and they will only point to your VPS.
    Best Regards,

    Bryan Oscar
    eUKhost - Web Hosting Solutions...!
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    VPS_Newbie is offline Forum Member
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    Hi Bryan,
    Sad to say, your reply contrasts poorly with the one that Rock made previously. You made virtually no effort to address the specific questions that I spent time trying to set out clearly.

    Quote Originally Posted by Bryan View Post
    IP address allocation :: You see only one IP address under this subject because you are allotted 2 IP addresses for your VPS, the first IP address is the main VPS IP address and the second IP address which you see under IP address allocation is the IP added and assigned to your VPS.
    'the second IP address which you see under IP address allocation is the IP added and assigned to your VPS'

    That tells me absolutely nothing. It's pretty self-evidently assigned to my VPS.

    From reading the links lower down, I now suspect that the second IP address has to be supplied to be in compliance with an internet authority requirement that there should be two separate IP addresses for nameservers??? But nowhere is that stated.

    Quote Originally Posted by Bryan View Post
    Click on the link below for detailed information on Name Servers.

    www.eukhost.com/forums/f27/what-nameserver-6201/"]What is a Name Server?
    Another generalised link on nameservers! There's 5 million out there and I've read most of them. But none of them, nor this one, answer the questions that I asked!

    Quote Originally Posted by Bryan View Post
    If you register a domain name and wish to have the name servers to be set using your domain name, then the name servers have to be first registered at your Domain Registrar. The name servers can only be registered from where the actual domain name is registered.
    Again, a generalisation that's available anywhere. I tried to ask specific questions about the mechanics of what this means, but it looks like you didn't bother to read them.

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