Hello, Similar issue. It is RB2011UiAS v6.47.10 with only wire ports. ether1 router port uplink to ISP. ether2-ether10 and spf1 are LAN bridge. Client mac from ether2 went out on ether1 router port and caused a security violation on ISP side. Magical ether2? :) Up to now it happened one time for 4 d...