can't see other mac workstation in Ethernet, ok in wifi

So, I upgraded router to latest dd-wrt firmware.

Now, for some reason, can't see my macdesktop from my macbook if connected to Ethernet. Macbook has DHCP, mac desktop has DHCP with manual IP.

I can see the desktop if I connect via Wifi, but not through Ethernet.

I've Released / Renewed DHCP a few times, rebooted, flushed dscache, power cycled router.