@Cactusdan78 

Hi,

Did those forums you mention specifically talk about the Archer C6 ?

I am not aware that the lastest firmware for the Archer C6 V4 added support for DHCP Option 61 (MER) authentication.
 

Hi  @woozle 

Thanks for the reply. It was a sky forum and someone stated that they had used the settings someone else had supplied relating to option 61 and the C6 worked fine on sky fttp but it was an older firmware as the post was from 2021.

I wonder if any version did support this and it's possible to downgrade although I don't really like doing this due to the security aspect of it. A real pain if I have to leave the sky router in the mix.

  @Cactusdan78 

Ok, I see.

The Archer C6 V4 was released in the year 2022, so the user in question must have used an earlier model like V3.2 or V2.

But still, I am not aware of any router model made by TP-Link (for home use) that allows the user to freely configure an Option 61 client identifier. (i.e. like having a dedicated input field into which one can type the required string)

And TP-Link's Ethernet Wi-Fi routers (the routers without built-in modem like the C6) also don't come with selectable preconfigured ISP profiles that already include the correct Option 61 identifier.