I am a happy owner of HAP AC2. Until recent storm, during which a lightning has burned off my ISP’s switch. After they provided new one for my block, my Internet speed dropped down from 100mbit to 10 mbit.
I figured out that my ether1-wan port may have been damaged, so I switched WAN to ether3 → removed ether3 from bridge, set up dhcp-client on ether3. It works fine with full speed.
I wanted to check how ether1 will behave on LAN, but I cannot connect to it. I have added it to the bridge and checked that none of the firewall rules have static ‘ether1’ set up.
My routing knowledge is not vast, so I would like to ask you for help.
After your confirmation that my setup looks ok, I remembered that my old laptop also has an Ethernet port, so I tried to connect it to ethernet1, and it worked. That means the problem now is on my windows pc.
To sum up, the affected port also negotiates 10M on lan, so I suspect something has burned off there. Maybe one day I will hard reset the router and check again.
I am going to suggest you get a replacement ordered. Even though all may seem fine, you could start having intermittent issues with the router that are unexplainable and cause great grief in trying to diagnose. I would also suggest adding a inline surge protector to your WAN line to help from happening again. I do speak from personal experience.
So absolute folly than I still use on production one CRS112-8P-4S from years, with ether1 broken, without cause any useless pollution and without dissatisfied customers (and with money on my pocket increasing each month)
And if for any reason, in the future, it should break (maybe that new one would have broken for the same reason too), at least in the meantime he made me earn the money to buy one new.