newbie lost in trying to setup NAT

Discussion in 'Server Networking' started by vvu, Sep 2, 2004.

  1. vvu

    vvu Guest

    i still cant get it to work. i dont know what im doing
    wrong.
    if my AD network was working fine before i attempted to
    setup a NAT then i wouldn't have to change anything on the
    clients pc's(is that right?).
     
    vvu, Sep 20, 2004
    #21
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  2. I hate to ask, but could you re-explain the situation and what you have
    done? I can not follow the story because the past quoted posts have been
    chopped up so bad with all the ">> > >>" infront of the lines.

    These two articles would be the "Bible" for setting up NAT on Server 2000 &
    2003, if that is what you were doing.

    299801 - HOW TO: Configure a Windows 2000 Server as a Network Address
    Translation Server
    http://support.microsoft.com/default.aspx?scid=kb;en-us;Q299801

    310357 - HOW TO: Configure the NAT Service in Windows 2000
    http://support.microsoft.com/default.aspx?scid=kb;en-us;310357
     
    Phillip Windell, Sep 20, 2004
    #22
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  3. vvu

    vvu Guest

    That's not a problem, I'll explain it 1000 times i really
    want to figure out how to get this working.

    ok, i have a pc running 2003 server which acts as a
    DHCP,DNS,AD.
    i also have a client pc running xp.
    i've setup an AD network and it works fine.

    on the 2003 server i have 2 NICs. one connecting to the
    internal network and one connected to the cable modem.
    the NIC connected to the internal network is configured
    with an ip of 192.168.1.1.
    the NIC connected to the cable modem is configured with
    automatic settings. internet works fine on the server pc.

    i have followed articles:
    'How to Configure a Routing and Remote Access NAT Server'
    section from article:
    How To Configure a NAT Server in Windows Server 2003
    http://support.microsoft.com/default.aspx?scid=kb;en-
    us;324264
    (instead of creating new interface i selected the NIC
    connected to the cable modem)

    and the 'How to Configure Forwarders' section from article:
    How To Configure DNS for Internet Access in Windows Server
    2003
    http://support.microsoft.com/default.aspx?scid=kb;en-
    us;323380#7

    should i be putting my ISPs DNS IP on the NIC connected to
    the cable modem?
    the client pc(running xp) works fine on the AD network so
    should i be changing any of its TCP/IP settings?

     
    vvu, Sep 21, 2004
    #23
  4. Is the Cable Modem also a NAT Device? What Net Config does the NIC recieve?
    (I mean more than the IP#). Do an "IPCONFIG /ALL" and see what it shows for
    that external NIC. It should not be allowed to receive a DNS setting. The
    only DNS settings should point to the AD/DNS and nothing else. The DNS on
    the External NIC can be left blank.
    Follow these two articles instead. I never heard of "creating an Interface"
    in this situation. You may be following the wrong instructions.

    299801 - HOW TO: Configure a Windows 2000 Server as a Network Address
    Translation Server
    http://support.microsoft.com/default.aspx?scid=kb;en-us;Q299801

    310357 - HOW TO: Configure the NAT Service in Windows 2000
    http://support.microsoft.com/default.aspx?scid=kb;en-us;310357

    Forwarders are the right way to add the ISP's DNS to your system.
    No.

    More than likely you simply have RRAS/NAT improperly configured someplace.
    On my NAT box (2003) I have noticed that after a reboot, I have to open the
    browser and let it access the Internet at least once or the NAT doesn't seem
    to start functioning for the clients. After it has accessed the Internet
    once, then NAT starts working. I don't know why it acts like that (don't
    really care) but it doesn't get rebooted enough to worry about it.
     
    Phillip Windell, Sep 21, 2004
    #24
  5. vvu

    vvu Guest

    i have looked at the articles you refered to and they are
    quite similar but there are some differences between 2000
    and 2003 that i am unsure of.

    ok so this is what i have done.
    i installed RRAS through 'configure you server wizard'.
    in this wizard i selected 'NAT' and then chose the
    interface that is connected to the cable modem and then
    clicked 'finish'

    i then go into the RRAS mmc. expand 'IP Routing' and
    under 'general', 'NAT/basic firewall' already exists.
    and interfaces(internal+external) already setup.

    in the win2k article it says to click 'automatically
    assign IP address by using DHCP' on the internal interface.
    i could not find this on my 2003 server but it i did find
    this option in the 'properties' of 'NAT/Basic firewall'
    under the 'address assignment' tab.
    now with this option im running DHCP so should i be
    putting in the IP of the server(192.168.1.1)?

    on the win2k article it says to select the 'translate
    TCP/UDP headers' but i dont know where this is on my 2003
    server box.

    in the 'name resolution' tab, if im running a DNS server
    should i be checking the 'clients using Domain Name
    System'?
    also i dont select 'connect to the public network when a
    name needs to be resolved' box do i?

    appriciate the help.
     
    vvu, Sep 24, 2004
    #25
  6. Forget about *all* the DHCP stuff. If you don't get it working using static
    addresses first, then you are wasting your time messing with DHCP. Don't
    make something that already doesn't work more complicated than it already
    is.
    I have no machine with RRAS here to look at. If the article doesn't explain
    that, then I don't know.
    Probably not. Clients will use your own AD/DNS, which is "local" and not on
    the "public" network. Then your AD/DNS uses the Forwarders List to pass the
    queries on to the ISP's DNS.
    Probably not,...same reason as above.
     
    Phillip Windell, Sep 24, 2004
    #26
  7. vvu

    vvu Guest

    i have done all that but still cant get it to work. i feel
    like there is a minor detail somewhere im leaving out.

    im not sure if this is relavent or not but my NIC's
    (connected to the cable modem) TCP/IP properties are all
    set on automatic.
    when doing an ipconfig /all it displays the NICs IP, the
    ISP's DNS servers(primary and secondary), the default
    gateway.

    should i leave the NICs(external) settings alone(all on
    auto)?
    so the only time i use my ISPs information is in the DNS
    fowarding where i put in my ISPs DNS IP, is that right?

    i don't need to input the default gateway anywhere do i.
     
    vvu, Sep 25, 2004
    #27
  8. That could be a problem. Is is a private address?,...or a public one?...that
    can become a big issue. *Assuming* that it is a public address, contact
    your ISP and see if they allow you to statically configure the address. Then
    you can put the address in yourself and leave the DNS blank. If you are
    stuck with DHCP from them, then your only hope is to make sure that the
    Internal NIC is set to be the Primary Nic (top in the priority list). This
    is found at the properties of Network Places, then pick "Advanced" from the
    top menu, then pick "Advanced Settings.." from the menu that drops
    down,...it should be obvious from there. On the External NIC "unbind"
    everything except TCP/IP (no Microsoft Networking, no File/Print Sharing,
    etc).
     
    Phillip Windell, Sep 28, 2004
    #28
  9. vvu

    vvu Guest

    That could be a problem. Is is a private address?,...or a
    public one?...that
    can become a big issue. *Assuming* that it is a public
    address, contact
    your ISP and see if they allow you to statically configure
    the address. Then
    you can put the address in yourself and leave the DNS
    blank. If you are
    stuck with DHCP from them, then your only hope is to make
    sure that the
    Internal NIC is set to be the Primary Nic (top in the
    priority list). This
    is found at the properties of Network Places, then
    pick "Advanced" from the
    top menu, then pick "Advanced Settings.." from the menu
    that drops
    down,...it should be obvious from there. On the External
    NIC "unbind"
    everything except TCP/IP (no Microsoft Networking, no
    File/Print Sharing,
    etc).


    im stuck with a dynamic ip from my ISP.
    i cant seem to find out where to make the internal NIC
    primary.
    i know where it is on win2k but cant seem to find it on
    win2003.
    i right click and get into properties of 'my network
    places' or 'network connections' but it just brings up the
    network connections window displaying the 2 NICs along
    with 'new connection wizard'
     
    vvu, Oct 5, 2004
    #29
  10. It is still in the same place. I am looking at it right here on one of my
    Server2003 machines.
     
    Phillip Windell, Oct 5, 2004
    #30
  11. vvu

    vvu Guest

    sorry but im not sure where it is, do you access my
    network places on your desktop?
    because with the default install of 2003 it doesn't have
    any icons on the desktop and if i go through the start
    menu and right click the network connections it just
    brings up the network connections window.
     
    vvu, Oct 7, 2004
    #31
  12. Start Menu --> Control Panel --> Network Connections

    Right Click on "Network Connections",..do not go all the way to New
    Connection Wizard or Local Area Connection.
     
    Phillip Windell, Oct 7, 2004
    #32
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