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Cable modem and W2K network

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by identcc 1 view

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OK, I have a network running W2K server (w/AD and DHCP running). Connected to the 10/100 hub are three workstations; two are XP Pro and the third is W2K Pro. I'm trying to add a Linksys 4-port router and cable modem to this hub (with NAT, I presume) so that the cable modem can be shared. I'm able to ping the "internal" side of the router, but, unless I'm connected (with some other method) to the Internet, I can't ping the "external" side. The cable modem is receiving an address from AT&T fine, but my internal network still can't use it. In other words, it seems as though NAT is doing what it's supposed to be doing, I just can't "cross" the router. Any ideas?

10 replies

by mrafrohead

What is the model number of your router??? That way I know we're using the same thing and I'll know what I'm talking about. I JUST purchased a Linksys 4port router myself and set it up, so I'm still quite familiar with the operations of it...

Let me know and I'll be more than happy to help out.

mrafrohead
@yahoo.com

by geo1

In my experience with Cable Internet, You connect the cable modem to a Win2K PC (guess XP is same) with 2 NIC Adapters. The NIC connected to the Cable Modem is settup with IP and DNS pointing to your ISP/Cable Modem, and your second NIC connects toyour Hub and will perform NAT to your internal network. You also have to set for this PC to share the connection. Your ISP and Windows Help should give you more detail if needed.

by andrewzz

Set it up this way. CAble modem connected to the router uplink connector. Each PC connected to the router. Setup the router defaults....You may have restricted access accidently.

by renotek

If the router is capable of dhcp you might need to turn it off. Have you place the router's internal ip in your dchp server configuration? Is the router's internal ip address in the same subnet as your network?

by identcc

I did turn off DHCP and yes, the routers internal IP is included in the config. It is also the same subnet as the rest of the network. See, I can share the cable modem through the router, but if I plug the router into the hub and then try to shareit, it doesn't work. Again, I'm running Active Directory on my server with integrated DNS and DHCP. It just seems like this should easily work but it doesn't and I can't seem to figure out why.

by identcc

The problem with that is that I would not be able to use Active Directory that's running on the server.

by mrafrohead

Okay, so you've got a diagram like this then???

modem

router

pc1 pc2 pc3 hub???

If this is the case, send me an e-mail and I can help you with it. I dont have the instructions here with me at work, but they're at home and I think that I'm getting a drift of what you are doing.

I was able to get my system working 100% so I am confident that I can help you with yours, if you haven't gotten it going already...

So please, send me your current configuration along with your desired hookup and we'll get it all squared away;)

mrafrohead@yahoo.com

by lrund

When using a hub on a linksys router you are expanding the number of ports available on the router via the hub. You must connect the hub to port 1 of the linksys router to use it correctly. The connections should be: plug cable modem to input of the linksys router, hub to the port 1 of the linksys router. Then PCs to the hub. If you want to forward any protocols from the internet like ping to a specific machine, you need to use packet forwarding on the linksys. That is the second tab on theadvanced setup.

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