I've got 4 adapters in use (XAV5001). How it works is that all four adapters negotiate together to elect a central node to which all the others communicate packets. As far as I understand, the election usually picks the node that is "closest to the internet." If you run the NETGEAR powerline utility, it will display communication paths from the central node to each of the other nodes, but no paths between the other nodes. This suggests that communication between two of the losing nodes will transit the powerline twice - once from loser-1 to the central node, and then repeated to the loser-2.
Do not redundantly connect any of the adapters on the Ethernet side, or chaos ensues.
If you want to have two independent links between pairs of nodes, it can be arranged by setting the encryption keys for each pair to different values.
Hi, I'm sorry, but I speak a little english. I have four powerline XAV5001. I try to explain my problem. I connect a terminal to router, the others in other rooms to connect pc to internet. For the first all ok; for the others limited connection. The first pc has ip 192.168.x.x, but the others have ip 164.x.x.x All the rooms are on the same electric net. Where is my error? Thank You for help.