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How to use a public IP address when all others are non-routable?

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  • How to use a public IP address when all others are non-routable?

    I added a new Windows 2003 R2 server into an existing domain consisting of just one Windows 2000 SP4 server and a few XP clients.

    The existing 2000 domain uses private IP addresses of the subnet. I had to give the new 2003 server one of them to join it to the domain. But now I want to change it to a public IP address so it can be a web server. But I still want it to be part of the domain and be able to share files and printing. And I may make it a backup domain controller.

    The public IP address is part of a contiguous block of 8 that we bought from our ISP. One of the others is used in the DSL router. I think the router is what hands out the private IP addresses to the domain PCs. I put some details about this at the bottom.

    Can I accomplish my goal (the posted question)? If I have to, I can give the other server, the 2000 box, a public IP address that is in the same subnet as the DSL router and the new 2003 box.

    * Our ISP is Qwest. The 2000 server is connected to a Qwest 2-Wire DSL router.
    * Under “Current Settings” it is set up with “Public Proxied Subnet (NAT/Routed).”
    * Also under router’s “Current Settings” is “Private Network” and in that configuration area the router IP address is assigned to
    * In another configuration area DHCP is enabled. All the XP clients get dynamic IP addresses and they are always

  • #2
    Re: How to use a public IP address when all others are non-routable?

    Normally the router holds the single public IP and performs NAT (network address translation) so PCs inside can get out. You set up port forwarding on the router to translate public ports to internal ones e.g.
    "Everything arriving for port 80 gets sent to port 80"

    Since you have multiple public IPs your situation will be different. if your router is sophisticated, it may be able to cope with them, or all but one may be wasted.
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    IT Trainer / Consultant
    Ossian Ltd

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