Hello TP-Link I migrated from ER605 v.1 to ER605 v.2 and tried to configure Link Backup between WAN and USB Modem (both these connections work fine individually). I configured it as following: WAN...

@DirkTripleD This kind of issues usually means there is a bad cable, speed or duplex mismatch or a bad/flaky Ethernet port somewhere on the data path. If the devices can display port error counters...

@Mindau I have the same setup and versions and all works fine. Did you check if OC200 indeed has connectivity to the router ?

@SBilge Try to enable/check the box that says " Enable Application Optimized Routing ".

@ProSumerTester I used just plain screws, the devices have holes on the back to hang them on the wall. I put the rubber legs on the units just to avoid them chafing againts the wall. Does it need to...

@robladw If you want the two LAN switches to create one common Ethernet network - so devices on one switch can see devices on the other switch etc. - then I would suggest to connect the switches...