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Modem Sharing

Posted on 2001-09-13
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I have 2 networked pcs.  The server is Windows 2000 Advanced Server and is a Primary Domian Controller with the Cable Modem attached through USB.  Both pcs have network cards networked through a hub.  I ticked the Connection sharing option on the server but this isn't working.  The cable modem works fine on the server but both IP addresses on the network cards are coming up as 169.???.???.???

I am with NTL in the UK and have a Teryon modem.

Any ideas?

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Question by:daveamour
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The layout should be:

Wall outlet --> Cable Modem --> USB on Server
Server second ethernet --> hub
hub --> additional PCs

Thus, the server has two network connections:  one to the cable modem and one to the internal network

You want to share the cable modem with the rest of the internal network.

This should do everything you want.  However, if you want more control (such as the IP schedule internally) then you should use the Routing and Remote Access Internet NAT instead of the sharing.  For just two PCs, its probably not necessary but if you want to know the details about that, just ask.

Ken Linger
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by:daveamour
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Hi

It seems that the day I got my modem installed NTL were having conectivity problems so I was doing everything correctly anyway!

I am interested in NAT so if you can tell me more about this that would be great.

Cheers

Dave
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by:Linger
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Well, for NAT, you control the DNS, DHCP, and router configuration so you can use any internal network you want (such as 10.x.y.z or 192.168.x.y or anything else).  Keep in mind that if you don't use a sanctioned Internal address like the two above, you may have problems later accessing certain sites.

To start, reset everything back to normal.  Set the Internet USB cable modem to not be shared.  Set a fixed IP for the internal network card (again, the 192.168.x.y or 10.x.y.z work pretty well).  For my examples, let's set the server as 10.1.1.1 subnet 255.255.255.0.

The default gateway of the internal network card should be blank (not 0.0.0.0 but empty).  The network to the Internet is probably server assigned (DHCP) but in case it isn't, you should have the default gateway filled in as well as a DNS server.



Next, if not already installed, install DHCP Server and DNS on your server.  This is through the ADD-REMOVE control panel (last tab).

Setup DHCP to assign an address in the same subnet as your internal address for the server (eg. if your server is 10.1.1.1, make an address range of 10.1.1.100 - 10.1.1.200 with a subnet of 255.255.255.0 [if that's the subnet of your computer]).  Also assign the default gateway through DHCP as 10.1.1.1 and DNS server is 10.1.1.1 as well.

Run, from Administrative Tools, Routing and Remote Access.  Right click on your server and install/setup R&RA.  Install Internet Routing but but choose sharing.  Instead, choose NAT.

You should add the Internal network card as the private network and the external network card as the public interface.  That should do it, I believe.  Unless, you have a range of addresses assigned to you by the Internet provider (not likely via cable although other people reading this may be setting it up at a corporation with a full class C).  You can assign a range of addresses to use by the public interface if you wish.

Benefits of this method?  Not many for a home Internet.  But you can then control your own DNS server so that you can make entries like "www.mynetwork.com" and have it loaded by all local machines but not Internet machines.  Its also easier to open up your internal network to certain outside services (such as if you wanted to FTP into your home server or another machine on your network).  That's way beyond the scope of what you asked but if you need more information, let me know.
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by:daveamour
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Ok thanks mate, I sdhall have a mess around with things.

Cheers

Dave
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