Can't see other Mac workstation via ethernet but OK over Wi-Fi So, I upgraded router to latest DD-WRT firmware.

Now, for some reason, can't see my Mac Desktop from my MacBook if connected to Ethernet. Macbook has DHCP, Mac Desktop has DHCP with manual IP.

I can see the Mac Desktop if I connect via Wi-Fi, but not through ethernet.

I've released / renewed DHCP a few times, rebooted, flushed dscache, power cycled router.
so it seems the problem is in the DD-WRT firmare upgrade. I downgraded to a previous DD-WRT and the issue is gone. It was a matter of lan switching not working.

Downgrading back to DD-WRT firmware SVN revision 23919 fixed it.