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DSL,Ruuting and a PDC...Yippee

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by bconklin

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Ok here is my quandry of the day. I have been asked to find out how to share a single DSL connection to the rest of a small network. There are 9 workstations and a WinNT 4.0 PDC. The PDC is running DHCP and TCP/IP Printer services for the clients. The ISP is also suppling DHCP through the DSL modem. So long as the PDC is offline all the client workstations can web browse and such using the IP addresses supplied by the ISP. I am under the impression that I should be able to set up the server to continue to supply addresses to the local network while also allowing internet traffic to flow out to the web. All the clients are Win95 or 98 and one Macintosh. Question is how do I do this deed?
The ISP has no problem with having a application server so long as it does not do web sight hosting, and it does not.

5 replies

by computechie

If it were me setting this up, I would disable DHCP on the server, and just use DHCP supplied by the ISP. This would just make it simpler, and possibly avoid problems. To set this up, all you really need to do is get 12 or 16 port switch, and use the uplink to connect to the DSL modem, and plug all your workstations and the server into the other ports, this way your users will still be able to authenticate and use the application server, and can access the internet at the same time. When your server is offline, they wont authenticate, but will still have 'net access, and wont have to renew the DHCP lease, which could possibly happen if you use your server to hand out IP's. I hope this helps you get it setup.

by bconklin

While it is true this answer would make life simpler, it does remove the central point of control the is necessary.

by mckaytech

I really don't like handing over control of my DHCP to an ISP so I agree with your plan and, yes, it is possible.

The easiest way to do it is with a low-end Cable/DSL router. It will obtain it's external IP from your ISP via DHCP and it will present a gateway address to your internal network. On your PDC, you will set up DHCP to supply this gateway address as part of the DHCP info and as long as this gateway address is on the same subnet as your assigned addresses, everything will be just peachy.

On my system, the NT server is at 192.168.0.1, the router gateway is at 192.168.0.254, and I've set up DHCP to supply addresses in the range of 192.168.0.20 to 192.168.0.60 (standard Class C subnet mask of 255.255.255.0 and addresses below.20 are for static addresses for servers and printers).

The first workstation to log on gets 192.168.0.10, the second gets 0.11, and so on, and the Network Address Translation (NAT) on the Cable/DSL router keeps it all straight.

paul

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