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TCP/IP Errors

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by support 1 view

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I recently purchased ADSL Broadband with fixed IP Addresses for our networks. We have 22 Sites and would like to install our own Intranet.

The problem we are having at the moment is the Fixed IP addresses work fine on a sole PC the range is 62.188.52.20 with Subnet Masks 255.255.255.248. But when I change the other PC's IP Addresses to the same ranges the PC's do not communicate with each other. I have tried pinging each IP address.

Operating system we are running are 95/98 machines. The original IP addresses were the public range of 192.168.0.xx with subnet mask 255.255.255.0.

I always thought that you could use any IP address.

Please HELP!!

Yours Alan Gidman

5 replies

by alpha-male

You absolutely cannot use any IP address. If you are using the "non-routable" address ranges (like the 192.168.x.x) it's okay because they are designed to be internal addresses. The 62.188.52.20 address your ISP assigned is a *real* IP address available to the world.

If you have static IPs provided by your ISP, you can assign them manually or through a DHCP server to your machines. If you only have one IP and need to network all the computers (and share the internet) what you'll need is a DSL router or software set up to work as a router.

You can use NAT to configure your LAN...with the Public interface being your static IP address and a second network card in your server set up to a private IP address (192.168.x.x or 10.0.x.x). Then set the private interface on your server to be your default gateway. This way, the private address will be hooked into your HUB and will let your machines see each other (since they are on the same network), and the public interface will be your connection to the outside world.

If you give me some more specifics about your LAN (servers? server OS? Just using Workstations? ICS?) I can try to give more detailed assistance.

Good Luck.

by some guy in seattle

You will not be able to use the 62.x addresses to assign to your machines as you only have 8 addresses (6 usable) as given by your ISP.

Your best bet is to keep your internal addresses as they are (192.168.x) and run Network Address Translation (NAT) through a router or firewall. If you have any public servers, assign them a 62.x address each and save one for your internal users (using Port Address Translation allows for all internal users to share the same external address).

Hope that helps -

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