Tom's Hardware > Forum > General Networking > General Gateways, Routers and Firewalls > using a dsl router with a cable modem
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dncpax   10-12-2007 at 12:08:32 AM

Having switched homes, I have changed from a dsl connection to a cable connection.

I have a wireless router+adsl modem, with 4 wired ports, one port can be uplinked.
The model is Sitecom wl-108.

Now this router has a configurable routing section. I can turn on RIP 1 and 2, or create a manual routing table.

I don't know enough about routing to do it but I'm guessing there must be a way to configure the router to share the cable modem connection with my home pcs.

So the final question is: how can I connect the dsl router's network (192.168.1.0) to the cable modem network (84.90.186.0 and 84.90.184.0).

When I connect a pc directly to the cable modem I get these settings:
IP: 84.90.186.86
Subnet mask: 255.255.252.0
Default Gateway: 84.90.184.1

When connecting the pc to the dsl router (that has no dsl cable) I get these settings:
IP: 192.168.1.4
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1 (the router ip)

Can anyone solve this puzzle?

Thanks.
Duarte

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Grumpy9117   10-12-2007 at 02:23:54 PM
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Can't be done. You're wasting your time.

Grumpy

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g-paw   10-13-2007 at 12:34:23 AM
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Grumpy9117 wrote :

Can't be done. You're wasting your time.

Grumpy



Curious, would it be possible to disable the modem and just use it as a router?

Reply to g-paw
Grumpy9117   10-13-2007 at 12:55:49 AM
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No, there's no Internet port. You could use it as a network switch if you disable DHCP.

Grumpy

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g-paw   10-13-2007 at 01:00:59 AM
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Grumpy9117 wrote :

No, there's no Internet port. You could use it as a network switch if you disable DHCP.

Grumpy



Thanks

Reply to g-paw
dncpax   10-14-2007 at 05:29:01 PM
- 0 +

Hi again.

I only saw your replies just now.

The thing is I can connect through the router+modem if:

1 - I first boot everything normally (PC connected to modem, no router)
2 - I disconnect the PC from the modem, and connect the router to modem
3 - I connect the PC to router

I get to surf the web!

I'm hoping to get the same effect by configuring the router and the PC. There must be a way since it works using the recipe above...

Thanks for your help.

Reply to dncpax
micheljq   10-18-2007 at 09:24:21 PM
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Activate DHCP on the router and put all the computers on "obtening automatically an IP address", so they get the IP configs from the router. Reboot the computers and they all should go on the internet.

The cable modem plugs on the uplink port of the router. The computers plug on the ethernet ports of the router.

Reply to micheljq
Grumpy9117   10-19-2007 at 01:21:34 AM
- 0 +

There is no "uplink port" on a combination unit with a built-in DSL modem.

Grumpy

Reply to Grumpy9117
calyn   11-14-2007 at 08:50:47 PM
- 0 +

Grumpy's right. If the router is a DSL router the uplink port cannot be used as an uplink port with cable services

Reply to calyn
ricnic3   09-28-2009 at 06:57:24 PM
- 0 +

I did what yousaid.

plug the modem into the #3 slot on the router and to modem slot to the back of my pc now both my pc and laptop work.
thanks!

Reply to ricnic3
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