Downgrading c2110 ADSL Modem for Port Forwarding

[Juily]

I am having problem with my modem. I am using c2110 modem. I have upgraded its firewall few days ago. But now whenever I try to do port forwarding it fails. So I want to downgrade to the older version to do port forwarding. So right now I want v55.1.04.02 or V55.1.03.06 , my friend told me that this versions will provide port forwarding. And other question about it . if I downloaded one of them will I have to configure it after installation or will it do setting automatically. So I need help for reconfiguring it. So please provide me the solution.

[Amie]

First of all you have to check which version you are using you can follow this steps to find the version.
• Connect ADSL modem to pc.
• Configure tcp/ip settings for pc.
• Open internet explorer http:// ipadress of your system. Then press enter.
• Now the page will open type username as admin and you can keep password field as blank or you can enter admin as password.
• Now click ok
• On the overview device page you can check the firmware version of modem.
So here you can get details of the firmware version.

[Juily]

Thanks for helping me out to resolving the problem I am facing.I have tried your solution I stated the browser with the link you provided and gone through all the steps you provided .I have checked the version using the method you provided. And also downloaded the older versions drivers for the modem Siemens c2110 modem. Now tell me next what I have to do. To install those files what I have to do and how I can configure the mode again.

[Connect_Me]

Before doing anything turn of antivirus and firewall software.
I know how to upgrade or downgrade firmware version. Follow the steps.
• First do all the things as specified by him up to the login.
• Then to upgrade or downgrade firmware you need to have the file of firmware which you can download from internet.
• Go to the folder where extracted firmware is stored.
• Run PT4VnV.exe in folder itself.
• Click Burn option. the upgrade or downgrade will stats.
• When upgrade will be over message will popup press ok in it.
• Now close the internet explorer.
• Switch the modem off for 10 to 20 seconds .
• Now turn on the modem.
• Now if you see in overview device page you can see the new version which will be applied.

[Connect_Me]

You can configure your modem using following steps.
• Click on internet connection .
• Go to configure and delete PppoeUp . Deleting may take some time. Wait for screen to come up with message.
• Now click on the add. Type PVC Name =PPPoE , VPI=0 , VCl=35. Keep the default values. Click next
• Verify Protocol=PPPoE . Encapsulation Type=LLC/SNAP, Encapsulation Mode=Bridge. Click next
• Select ip addess is obtaining automatically.
• Now check the Enable NAT and ADD default Route. Click next
• Type Service Name=BSNL.
• Type Broadband username, password and confirm password. And session esablised by=Always on.
• Click next. The changed setting will come up verify it and click on apply.
• Now confirm PVC Name PPPoE is displayed.
• Now go to admin – Reboot
• Close the browser.
• Now turn on firewall and antivirus.
• Connect ADSL line to the modem and wait for the Link lamp to glow.
You can restore the old setting to factory default bet the firmware version will remain the changed version only.

[Paisley007]

Try to do this it will solve your problem of port forwarding. Only one change you have to do Uncheck PPPoE option and select bridged. Now click on Reboot. Also try to user dialer setup in it. If it doesn’t work try to use those setting on another pc and check if it works for that or not. You can try to use UDP as the protocol it can solve the problem.

[Juily]

Your instruction are useful, I successfully installed the older version on my modem and also added port forwarding for it but the port forwarding still not working for me. To check whether it’s working or not. I have run my call of duty 4 server. In this I can connect using my ip address but I can’t able to connect using external ip. I have checked the port whether it’s open or not. But it’s closed.