@Hank21 No, it is not designed to be like that.. if you connect it to any other kind of router you can always manage it irrespective of the other connection, for example if you connect it to a...

I use an SFP GPON module to connect to the internet on the ER7206, the only way I found to access the management interface via telnet or web is shutting down the internet connection, setting the SFP...

@irdis The very latest firmware I can find for your device is https://static.tp-link.com/resources/software/2007811083558.zip released a very, very long time ago.

@Fae No, nothing like the above, It is just the SFP led that remains inactive most of the time while the device itself is working fine.

@Fae after installing this update I have Schrödinger's SFP WAN light. It turns off randomly and does not come back until I reboot however the SFP device works just fine..

Ok ..and do you have access to the adminostratove interface of at least one of the HWA routers ? do any of them have something that they call "PPPOE passthrough" or PPOE frames to switch ports ? This...