I have three M5 Decos in router mode. The main deco (Deco A) is connected to the other Decos (Deco B and Deco C) via AV600 powerline adaptros.

The issue I am having is that PCs connected to Deco B can't see either the Deco C or any device conected to it. E.g. if PC1 with address 192.168.68.110 is connected to Deco B, and PV2 with 192.168.68.112 is connected to Deco C, then:

PING 192.168.68.112 (192.168.68.112): 56 data bytes
ping: sendto: No route to host
ping: sendto: Host is down
Request timeout for icmp_seq 0

The same happnes if I ping Deco C.

If I disconnect Deco C from the ethernet and allow it to connect to the master Deco (A) via wifi, then the pings work as expected.

Any thoughts?