It was reported that the "LuCI" web UI was not working properly
with a device using the RTL8366RB switch. Disabling the egress
port tagging code made the switch work again, but this is not
a good solution as we want to be able to direct traffic to a
certain port.
It turns out that sometimes, but not always, small packets are
dropped by the switch for no reason.
If we pad the ethernet frames to a minimum of ETH_FRAME_LEN + FCS
(1518 bytes) everything starts working fine.