I have a strange issue where my mikrotik router 951G-2HnD will establish a PPPoE connection after VDSL comes on but drop it within 2-3 minutes never to reestablish.
My set up is a zyxel VDSL modem, set up in bridge mode to my MIkrotik router which acts as a router/firewall for my home network. The MT performs NAT for my internal network while at the same time routing a small physical adress subnet I have from my ISP on which I have an external facing mail server. This is the reason the PPPoE is terminated on the MT as opposed to just using the Zyxel.
When I switch the Zyxel to routing mode, everything works fine and the PPPoE terminated at the Zyxel stays up.
This setup has been working for me just fine for over 2 years so it's not (should not) be setup incorrectly. I also checked the PPPoE settings on the Zyxel are the same as on the MT.
Any ideas appreciated.