You definitely add a route to your localsubnet via telnet on the modem, otherwise you won´t be able to access the webinterface or snmp.
It's a raspberry pi that is running DNS and pi-hole for adblocking
It's all described in the text ;)
I use it as a LAN2 connection that also connected to the Modem, so I can Access the Modems Management Network, because of pppoe the WAN Port loses its local address. With my workaround I managed that.
It´s a Rittal Flatbox 6U, number DK 7507.000
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