I added an additional WAN interface. It connects through PPPoE over a DrayTek Vigor 2820. The connections goes online an gets an IP address. Also communication via this connection (firewall rule which routes the services through this interface) works. Only issue is that that the 'interfaces' icon is red and marks the new new WAN connection with a red status. I don't know why as XG gives no clear explanation. Who can help?
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