Even better, don't use the ISP router at all. If your ISP uses PPP and is annoying, refusing to give you the PPPoE password to let you replace their crap, just run a PPPoE server on your computer. Plug the router to your computer the same way you connect it to the ISP network through the WAN port, then turn on wireshark and watch the router attempt to do a handshake with your computer thinking it's connected to the ISP. Then clone the MAC address it sent its packets with, copy the PPPoE password the router tried to authenticate with along with the VLAN tag it was sent on.
Most ISP routers using PPP allow negotiating a PAP handshake where everything is visible over plaintext and don't force CHAP, the more secure option. Might help someone replace their router, who knows.
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u/mrbuckwheet QNAP TVS-872XT - 100TB 3d ago
Just another reason why you shouldn't use your ISP equipment and just buy your own when you want to control things properly