If I push LOF to 1275, I still get 4 channels, but now no Rx Bad packets at all. Interference in 1125-1250MHz range? I doubt Comcast is running that high in my area, but maybe someone has some loud MoCA gear? POE should block either, but maybe it's just a hunk of insertion loss 😅. Oh well, I'm getting almost a full duplex Gbit, so I'm going to stop worrying. Have a different splitter on order (antronix) to see if that helps.

Finally got 4 channels to bond by checking D-Ext and D-High and setting LOF to 1250. Now I get over 900Mbps each direction, and can get 800-900 when running iperf both directions at the same time. Seeing a few Rx Bad packets, but far fewer than when bonding all 5 channels. Any ideas what is going on when all 5 channels are bonding?

I've been playing some with settings, and find that if I limit to 1 or 2 channels, then I get more balanced performance (mid 400Mbps from 2->1, and mid 600Mbps 1->2). And the Rx Bad packets remains at 0. I can't figure out how to configure them to bond 3 or 4 channels. I've various combinations of D-Low D-High and D-Ext checked, and have tried a few different settings for LOF. What would be the right way to configure 1275-1675MHz as pictured in the MoCA 2.5 spec? I'm just trying to see if there's a way to narrow down which frequency band is giving me trouble.