Would you mind to elaborate/share on setting this up? There are few users that would be interested to know how to get DSLMonitor working. User experience - ALLNET ALL4781-VDSL2-SFP / Switch Modul (Mini-GBIC), VDSL2 - #79 by renne - Omnia HW tweaks - Turris forum.
Suppose by SFP you mean eth1? Which MAC you are sending the query frames to - eth1?