[Sephiroth]

I reckon, the difference between modem & router mode in this case is the first port of call.

In modem mode, the first port of call is the Devolo device and not the AE (does the green light show on the AE)? In my system, the AE is the first port of call.

In router mode, the furst port of call is the router section of the SH. The ethernet logic, if I can put it this way, is clean.

In your circumstances it seems to me that the AV500 isn't being served by the AE but by the Devolo itself - which it can't, if you see what I mean.

It's why I didn't have the AE in my office - in modem mode it would have it the Devolo 200AV first.