Cable Forum - View Single Post

mikeybrass · 05-05-2006, 12:32

Hi,

I hope someone may be able to help me. It is a networking issue unrelated to both the Mac and Windows laptops we have.

We are with NTL and have their 250 cable modem.

Original configuration: cable modem connected to a Belkin router. The router obtained its DHCP lease fine, it dished out internal DHCP fine to the two laptops. No problems there.

Connected a Linksys WRT54G wireless to the Belkin router. The wireless is configured for "auto configuration - DHCP", to pick up its DHCP from whatever it happens to be connected to. No problem there either.

What happened: because the Linksys is also a wireless router, I wanted to connect it up solely to the NTL modem. Plugged the modem in directly but, while I could pick up a DHCP lease on my comp with the wireless, there was no internet connection.

I changed the setup back to the way it was originally (wireless plugged into the router, modem plugged into router) and rebooted the three devices. No change - no internet connection.
So what I did was hook either laptop up to the modem directly. I shut both the laptop and the modem off, turned the modem back on and then the laptop. Bingo, Net connection.

So then I connected the modem up directly to the wireless again, connected my laptop by ethernet to the wireless and looked at the configuration of the wireless. Spotted the problem - although the wireless is set to get its DHCP from the modem ("auto configuration - DHCP"), it was not. No DHCP lease, no default gateway assigned.

However, if the wireless is connected to the router, the wireless is assigned a DHCP lease with a default gateway (the address of the router). But then the router in turn is not picking up a DHCP and gateway from the NTL modem.
But then if either laptop is connected directly to the NTL modem, the laptop gets assigned a DHCP and gateway, getting on to the internet.

Help, any ideas??? I have restarted the wireless, router and modem countless times. Help???

---------- Post added at 11:32 ---------- Previous post was at 10:43 ----------

Hmmm....maybe this is the reason (I'm at work now and cannot test out my idea).
No Mac address is registered in the Device Admin on the wireless. As this would not supply a Mac address to the NTL modem, would I be correct in saying this is why the cable modem does not return DHCP, gateway, DNS settings to the wireless?

05-05-2006, 12:32	#1
mikeybrass Inactive Join Date: Dec 2005 Posts: 12	Home network issues Hi, I hope someone may be able to help me. It is a networking issue unrelated to both the Mac and Windows laptops we have. We are with NTL and have their 250 cable modem. Original configuration: cable modem connected to a Belkin router. The router obtained its DHCP lease fine, it dished out internal DHCP fine to the two laptops. No problems there. Connected a Linksys WRT54G wireless to the Belkin router. The wireless is configured for "auto configuration - DHCP", to pick up its DHCP from whatever it happens to be connected to. No problem there either. What happened: because the Linksys is also a wireless router, I wanted to connect it up solely to the NTL modem. Plugged the modem in directly but, while I could pick up a DHCP lease on my comp with the wireless, there was no internet connection. I changed the setup back to the way it was originally (wireless plugged into the router, modem plugged into router) and rebooted the three devices. No change - no internet connection. So what I did was hook either laptop up to the modem directly. I shut both the laptop and the modem off, turned the modem back on and then the laptop. Bingo, Net connection. So then I connected the modem up directly to the wireless again, connected my laptop by ethernet to the wireless and looked at the configuration of the wireless. Spotted the problem - although the wireless is set to get its DHCP from the modem ("auto configuration - DHCP"), it was not. No DHCP lease, no default gateway assigned. However, if the wireless is connected to the router, the wireless is assigned a DHCP lease with a default gateway (the address of the router). But then the router in turn is not picking up a DHCP and gateway from the NTL modem. But then if either laptop is connected directly to the NTL modem, the laptop gets assigned a DHCP and gateway, getting on to the internet. Help, any ideas??? I have restarted the wireless, router and modem countless times. Help??? ---------- Post added at 11:32 ---------- Previous post was at 10:43 ---------- Hmmm....maybe this is the reason (I'm at work now and cannot test out my idea). No Mac address is registered in the Device Admin on the wireless. As this would not supply a Mac address to the NTL modem, would I be correct in saying this is why the cable modem does not return DHCP, gateway, DNS settings to the wireless?