TalkTalk D-Link DSL-3780: Info and Use with Other ISPs

Hi!

Security Alert: This router has been found vulnerable to Mirai worm. Here are some steps to try to prevent such attacks (disconnect the 'internet' cable and reboot first just in case):

1. Change default admin password if you haven't done so

(Change via Console is preferred)

2. Disable Remote Management (may prevent future updates though ... manual update would be needed if new firmware is released)

3. Remove additional users from config file (Advanced)
- Save the current router configuration via Maintenance tab from Advanced GUI to a PC

- Edit the config file for "Account" section and remove the extra users apart from admin by deleting the Entry1 and Entry2 sub-sections

Note: One can also change the default password for the admin user here if not already changed. Be sure to change the console password as well!

 <Account>  
      <Entry0 username="admin" web_passwd="admin"  
 console_passwd="admin" display_mask="DF FF F7 BF FF DF FF FF FF" />  
      <Entry1  
 username="qwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyuiopqwertyui"  
 web_passwd="12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678"  
 display_mask="D2 8C 84 8C 8C 8C 8C 8C 8C" />  
      <Entry2 username="user3"  
 web_passwd="12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678"  
 display_mask="5E 8C 6 8C 8C 8C 8C 8C 8C" />  
 </Account>  

- Load the modified file back up to the router

4. Verify that ACL is blocking remote (WAN) access

Update: TalkTalk claims to have a temporary fix with the permanent fix via firmware update also available. More info at http://help2.talktalk.co.uk/miralwormupdate
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Another router from D-Link (there is another similar looking model by Huawei) provided by TalkTalk (ISP from UK) that can be found here in excellent to sometimes mint condition as the model was replaced with a newer model in a short time period. Hardware wise, it seems to be a nice router but the user interface needs improvement.

Username Unlock:

The router is locked to TalkTalk as it accepts usernames with specific allowed-domains only, though, the other modes like IPoE that don't require authentication work well. Fortunatley, there is also a way to edit the configuration file to make the router accept any username allowing usage with other ISPs. Here is the process:

(To continue reading, please click on 'Read More')

 - Logging in at 192.168.1.1 with default username "admin" and password "admin" without quotes (after a reset to Factory Defaults)

 - Advanced Settings Tab

 - Configure as per ISP settings and Connection Type

- Including "@talktalk.net" to the desired username for own ISP without quotes makes the router accept and continue

- An editor like gVim or Notepad++ can be used to edit the file easily! Only need to remove the "@talktalk.net" part as shown below

- The custom username has been accepted and the router should connect to the required service! A restart of the router might be required initially to get the router to connect!

Note: The above configuration is for local ISP PTCL in Pakistan for users on ONU! Your settings may vary!

Here is a video showing the process as well as a connection test for WAN (Fibre) connection via a local pppoe server verifying the process:

Update: 04th March, 2017

After many requests, I tested the DSL-3780 router with PTCL especially with their SmartTV IPTV offering at somebody else's house as we have GPON now. The IPTV worked without any "extra" configuration other than configuring the PVC as required. Also, there is a hidden page to configure port bindings to limit the IPTV traffic/STB to one of the LAN ports (recommended) available at: http://192.168.1.1/cgi-bin/ADVANCED/ad_port_binding.asp

Note: The router took a longer time to boot and sync than the time the IPTV STB waited for a connection! Had to turn the STB on and off again after router had connected!

Here is an embedded video showing the IPTV working:

To be continued ...