Access To Modem Configuration

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Revision as of 12:41, 13 October 2006

1 Case of a Bridged modem
- 1.1 Presentation
- 1.2 The way to follow

Case of a Bridged modem

Presentation

In this case the router itself creates the PPPoE connection to the ISP server; but to work, the connection between the modem and the router must have an IP address. Usually the modem gives an address to the client; but this address will never be used except in some case to access to the configuration interface of the modem.

My modem is a Speedtouch 510, is IP address is 10.0.0.138 and it gives the 10.0.0.1 address to the device connected to it. The easiest way to know these addresses is to connect the modem directly to your computer and take a look to your network card configuration. The default gateway is the Modem address and the Card address is the one provided by the modem. It should be noted that a lot of modems come preconfigured to use the 192.168.1.x IP range. This will need to be changed for this to work.

So it's look like this.

   |<---------- PPPOE link ---------->|    
   |                                  |    |====== 
  ISP ======= bridged ============== WRT ========= PCs
               modem |              |   |  |======
                     |              |   |
                     |<- 10.0.0.x ->|   |<-- 192.168.1.x -->>

By default if you type the IP address of the modem you have an "Impossible to contact the server" error.

The way to follow

Eventually replace the 10.0.0.x by your addresses

Go to Administration -> Diagnostics and click on run
Enter

ip addr add 10.0.0.1/24 dev vlan1 brd +

ifconfig vlan1 10.0.0.1 netmask 255.255.255.0 broadcast 10.0.0.255

and click on Save Startup

Enter

/usr/sbin/iptables -I POSTROUTING -t nat -o vlan1 -d 10.0.0.0/24 -j MASQUERADE

and click on Save Firewall

Retrieved from "http://forum.dd-wrt.com/wiki/index.php/Access_To_Modem_Configuration"

Category: English documentation

 == Case of a Bridged modem ==
 === Presentation ===
-In this case the router create himself the PPPoE connection to the ISP server. But to work, the connection between the modem and the router must have an IP address. So usually the modem give an address to the client. but this address will never be used except in some case to access to the configuration interface of the modem.
+In this case the router itself creates the PPPoE connection to the ISP server; but to work, the connection between the modem and the router must have an IP address. Usually the modem gives an address to the client; but this address will never be used except in some case to access to the configuration interface of the modem.
-My modem is a Speedtouch 510, is IP address is 10.0.0.138 and it gives the 10.0.0.1 address to the device connected to him. The easiest way to know these address is to connect the modem directly to your computer and take a look to your network card configuration. The default gateway is the Modem address and the Card address is the one provided by the modem. It should be noted that a lot of modems come preconfigured to use the 192.168.1.x IP range. This will need to be changed for this to work.
+My modem is a Speedtouch 510, is IP address is 10.0.0.138 and it gives the 10.0.0.1 address to the device connected to it. The easiest way to know these addresses is to connect the modem directly to your computer and take a look to your network card configuration. The default gateway is the Modem address and the Card address is the one provided by the modem. It should be noted that a lot of modems come preconfigured to use the 192.168.1.x IP range. This will need to be changed for this to work.
 So it's look like this.
 By default if you type the IP address of the modem you have an "Impossible to contact the server" error.
 === The way to follow ===