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4 posts

Wannabe Geek


Topic # 11729 9-Feb-2007 00:24
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Hi Geekzone,

I used to have a network like this:

Phone line, to a dynalink RTA1320 modem, to a D-Link wireless router, connected to PCs.

I could access the router at 192.168.0.1, and the modem at 192.168.1.1

While I was messing with port forwarding I thought it would be clever to disable the DHCP server on the modem. Once I did that, the modem disappeared from my network - I could no longer go online, or access it by connecting to 192.168.1.1


How do get back to the modem configuration page so I can re-enable DHCP?

I can physically connect the modem
1) to the router, with network cable
2) directly to a PC, with network cable
3) directly to a PC, with a USB cable

The modem is detected, but I can't make it work. If I try to repair a connection from the PC to the modem, the repair fails at 'Clearing the DNS cache'

I'll be greatful for any tips...


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BDFL - Memuneh
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  Reply # 60208 9-Feb-2007 09:12
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Disabling the bulit-in DHCP on the modem shouldn't have changed its own IP address. You can manually assign an IP address to your PC, with the modem as the gateway and the DNS from your ISP, and then browse to 192.168.1.1 (make sure you are connected directly to the modem). Then reenable DHCP and don't touch it again...








4 posts

Wannabe Geek


  Reply # 60246 9-Feb-2007 13:21
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Hi,

I plugged the modem into the computer with cat5 and set the local IP address, gateway and DNS. I still can't get through...


configuration screenshot

The DNS settings are from a slingshot help page.

I did recieve one packet from the modem...

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  Reply # 60250 9-Feb-2007 13:28
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Change your IP address to 192.168.1.13

note the '1' instead of the '0'



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Wannabe Geek


  Reply # 60254 9-Feb-2007 13:59
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I love you all!

I changed the IP address as instructed and could access the modem again.

When I tried to re-enable DHCP, the modem said "DHCP IP address range is error".

The settings were:

Start IP: 192.168.0.1
End IP: 192.168.1.254

I changed the start IP to 192.168.1.1, because changing 0s to 1s clearly has a magic I don't understand. And it worked, DHCP is on again.

Just before I plug the modem back into my router, can you tell me exactly what the 0-to-1 business is? Will I now have to change my router's IP address from 192.168.0.1?

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Ultimate Geek
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  Reply # 60255 9-Feb-2007 14:04
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Simply put, it's all about being on the same subnet. To ensure that all the devices that you want to use together are on the same subnet then you shouldn't have any communication issues.

The subnet in this case is the 192.168.1.* one. So basically, you want each of your devices to have a unique IP address in this subnet. So for instance:

Modem is 192.168.1.1
Router could be set to 192.168.1.10

It is easiest to give your Router a static IP (192.168.1.10) and enable it to be the DHCP server, thus the router will hand out IP address rather than the modem. Then you can turn of DHCP on the modem, if you wish that is



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Wannabe Geek


  Reply # 60304 10-Feb-2007 00:00
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Thanks. I turned DHCP back off on the modem, set up the router with a static IP and that worked. This made it easy for me to set up port forwarding so I could use P2P programs, which was my goal back at the start.

MSN Messenger stopped working at the same time, though. I'm not sure what to do about that.


BDFL - Memuneh
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Reply # 60309 10-Feb-2007 09:03
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Probably MSN Messenger was using UPnP to manage the router, since it appears the configuration was managed by the router. Check if you can enable UPnP on your modem.

If MSN was working before than another idea would be to have the modem with a static IP address and let the router handout the DHCP addresses. Make sure you change the router to a static IP address first before you change the modem.

Of course it all depends on the capabilities of each box on the network.






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