NAT or no NAT Service

Discussion in 'Windows Small Business Server' started by ryan1975, Oct 7, 2006.

  1. ryan1975

    ryan1975 Guest

    Hi, i am trying to set SBS 2003 with Exchange. I am not adding a hardware
    based firewall. When i order my router through the ISP, will i need to tell
    them to send a no NAT Router or a NAT'd router. and also if i am activating
    Exchange on SBS 2003, how many static IP address will i need.

    By the way, in case its not obvious, i am very new to networking. I would
    appreciate any reply or suggestions.


    ryan1975, Oct 7, 2006
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  2. First, welcome the SBS!

    You only need one IP address -- no need to pay for extra's. Many of us put a
    simple NAT router inbetween what the ISP provides and the NIC card.

    Since you say you are new ...
    1. Take a look at Handy Andy's series of screen snapshots on installing
    SBS --- to get a feel for what's involved (scroll down and look for Parts 1 thru

    2. Commit to installing/reinstalling SBS three times - once to just do it,
    once to do it and take good notes, and a third time to make sure your notes
    are correct. I explain why in this blog:

    3. Between each effort, ask all the questions you can, as you should have
    plenty. Such as --- should I name my server the same as my existing public
    web site? (NO!), should I use one or two NICs? How should I partition my
    drives? What should I use for A/V or antispam?

    Again, welcome aboard!
    Kevin Weilbacher [SBS-MVP], Oct 7, 2006
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  3. ryan1975

    Joe Guest

    To begin with, it's the old 'if you need to ask...'

    The reason for needing more than one IP address is to run a number
    of public-facing servers, and SBS is by definition a single-server
    solution. When you need more than one IP, you will no longer be new
    to networking, and will know without asking. Exchange will be the
    only mail server running on your network, so you won't need an
    additional address for it. All the SBS services can and do run
    from a single address.

    As to NAT: I'd say yes, but it doesn't matter that much. NAT is a
    means of translating IP addresses: when you use it, the machine
    facing the Internet uses your public IP address, and machines
    connected to it use another set of addresses entirely. It is most
    important in allowing many computers to use one IP address, but
    SBS does that anyway. The preferred configuration is to use two
    NICs in the SBS, and connect it between the router and the LAN
    workstations. Since SBS uses only one IP address externally, then
    the router does not need to do NAT, the SBS can take the public
    IP address on its 'external' NIC. I prefer the router to have NAT,
    as that will allow additional machines to be connected to the tiny
    network between the router and SBS. Visitors' laptops can be
    connected here to allow them Internet access without also allowing
    them access to the LAN. Also, if the ISP changes your IP address
    for any reason (and even if you have a fixed one, you'll find in
    the small print that it can be changed without notice) you don't
    need to do anything to the SBS, and the router will pick up the
    change automatically.

    Assuming you're not using an exotic means of Internet connection,
    the decision now is not too important. A DSL or cable router, with
    or without other facilities, is not too expensive and if you later
    need more than the ISP-supplied one offers, you can buy one. You
    could probably reconfigure yours: the only reason the ISP needs to
    know about NAT is so you can be sent a pre-configured router. It
    will almost certainly be possible to change it yourself later.
    Joe, Oct 7, 2006
  4. Ryan welcome to SBS

    Just some tips to help you.
    I recommend you reading this short document.

    In addition the book from Charlie Russel

    Microsoft Windows Small Business Server 2003 R2 Administrator's Companion

    Is a great Resource.


    Russell Grover
    Microsoft Certified Small Business Specialist.
    Remote Support Available
    MSN Messenger
    Support @ SBITS.Biz
    Search for SBS2003 answer on Google:
    Russ - SBITS.Biz \(MCP SBS\), Oct 7, 2006
  5. ryan1975

    ryan1975 Guest

    Thank you.

    Really appreciated.

    ryan1975, Oct 7, 2006
  6. ryan1975

    M. Hayes Guest

    heck you don't even have to have a Static IP anymore. Dependeing on you ISP
    the cost difference could be huge. Now, if you don't plan on hosting a web
    site that may get a large amount of hits per min. You could get away with it.
    Also, I suggest you host itelsewhere not on the SBS box. I think iIve seen
    M. Hayes, Oct 9, 2006
  7. Russ - SBITS.Biz \(MCP SBS\), Oct 9, 2006
  8. ryan1975

    ryan1975 Guest

    Firstly, thanks for your replies.

    Could you tell me if most routers provided by ISP's are NAT routers. I am
    trying to install a server on a wireless network that has this router:



    ryan1975, Oct 12, 2006
  9. Well that one is you point to it says Discontinued
    and I don't see where I can see the online manual?

    It does say Firewall,

    The main thing is if it can Forward Ports you need

    25 Mail - when you change your MX Records
    443 SSL
    4125 RWW

    444 Direct Connect to the CompanyWeb
    3389 Direct RDC to the SBS Box
    1723 VPN

    No you don't need Port 80 open to the SBS box.

    I doubt that it doesn't have these features now days

    Your Network should look either like this or this

    If you have 1 NIC turn OFF DHCP on the router, it will be easier for you.
    (Unless you understand DNS.)

    For Security and ease of set up it should look like this.

    Since you are new to SBS here's a good doc to read

    In addition the latest Book from Charlie Russel on SBS 2003 R2
    (Assuming you have R2 now)

    A lot of the questions you will ask, have already been asked
    Please take advantage of Google

    And search for answers,

    And yes, Kevin wasn't joking about the Three times install..


    Russell Grover
    Microsoft Certified Small Business Specialist.
    Remote Support Available
    MSN Messenger
    Support @ SBITS.Biz
    Search for SBS2003 answer on Google:

    Russ - SBITS.Biz \(MCP SBS\), Oct 15, 2006
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