For anyone familiar with Telnet, here is the fix you can do yourself -
Are you familiar with Telnet? You need Telnet to be activated on your OS.
Open a cmd window and type telnet 192.168.1.254
You'll then be prompted for a username ..... admin
and then the password (the TG582n's serial number)
At the telnet prompt, enter the following commands.
dns server config WANDownSpoofing = disabled
dns server debug spoof clear
dns server debug spoof list
saveall
exit
Also, you can check that the change was implemented by doing a Config Backup and looking at the Backup file. It's a good idea to do a backup anyway, because the change you have done - and any other changes you may have made to the default configuration before, will not survive a factory reset. Reloading a config backup would be a quick way of restoring all your custom settings should it be needed at any time.
Log into the 582n GUI, depending on your screen after log in select >Advanced Options at the bottom of the screen if need be, then
On the LH menu, select >Technicolor Gateway then >Configuration then >Save or Restore Configuration from the bottom of the page.
On the Backup& Restore screen, click >Backup Configuration Now. You'll be prompted with a default filename of user.ini which you can change if you wish, when prompted for the Folder to save it in.
Once saved (it's a text file), open it with a basic text reader (eg. Notepad or similar) and search for WANDown. You should find it in the [ dnss.ini ] section where it should say WANDownSpoofing=disabled
