Renew WAN ip address

I had the same problem and I solved it by accident: I had to relocate my router far from my tech cabinet, so I bought a passive PoE injector kit to drive the power from this cabinet's UPS; this kit however reduce the cable speed from Gigabit speed to 100Mbits.

Since my connection is 30/10, that's fine, but the nice thing is that now when I reboot my router, no need to reboot the modem like before with my gigabit link.