This has me really puzzled. I have fios with an old Verizon Actiontec MI424WR Rev I router, with ethernet WAN on the ONT and the router. I was purely interested in MOCA to get wired LAN into a couple of rooms in my house that I couldn't easily fish cat5 to. Since all I care about if MOCA 1.1 speeds (I need to stream 4k UHD rips on my NAS), I picked up a pair of additional Rev I routers, and set them up as pure MOCA to ethernet bridges per instructions on the net (basically disabled broadband and wireless). Anyhow, I'm getting 165 - 170 Mbps iperf rates from these "bridges" to my main router, but only half that rate in the opposite direction. The slower rate is associated with many more retries than when I test in the "good" direction. I tried many combinations of interchanging the physical devices, putting in a better splitter, etc, but to no avail. Frustrated, I decided to do an elementary test, so I put one bridge right next to the router and connected the two with a short piece of RG6. Still the same thing! Ironically, given my desire to stream 4k and the fact that my NAS is connected via ethernet to the main router, if the direction in which the slow speed is happening were reversed, I could live with it. Any ideas on how to solve this asymmetric speed issue?