The internet provider Bell in Montreal does not ship their modem in bridge mode, neither do they support this mode in case you try to call their customer service agents. If you go to the Web Interface of the modem, you will not be able to see a configuration page where you can change it to bridge mode (except the newer versions of their modems for home networking).
This will be a bottleneck in case you would like to access any PC behind the modem from an external IP address. The solution to this is to change the modem into bridge mode, which will then forward the request to the PC or Router connected behind the modem.
Since Bell does not support bridging the modem, here is a very quick solution to bridge the Siemens SpeedStream 4200 modem:
- Go to http://192.168.2.1/brgmode.htm provided that the IP of the modem is 192.168.2.1
- Click on “Apply” to change your modem into Bridge mode