@grapes I will assume you are in standalone mode without controller. Network > Switch > Port Config > (Find correct port row) > Set the Negotiation Mode

@modebm I set everything properly when trying the static option and the ER605 behaved as you saw by toggling the link/connection up and down repeatedly. (just like it did in dynamic) Considering my...

@modebm here is the result when I tried using static IP just now. Again, this product is downright embarassing. To finish the rest of the workday, I have just switched to my DI-604 router from 2003...

@GRL I use a TC4400 Cable Modem for my ISP which is the 192.168.100.10 IP address. The cable modem does not allow the user to do any network configuration. I'm not sure which exact config you are...

The ER605 continues to drop my WAN connection at least once a week. I see so many threads here and on reddit about WAN connection dropping and unreliability in general of both WAN and DHCP functions...

@LittleBam this was reported in an older firmware version and fixed. I think you'll see it's better if you update to latest firmware.