EDIT3: Have i made the static arp correctly ?
Code:ASUSWRT-Merlin RT-AC86U 384.19_0 Fri Aug 14 19:19:51 UTC 2020 classcomputers@RT-AC86U-AAA8:/tmp/home/root# arp -s arp: need host name classcomputers@RT-AC86U-AAA8:/tmp/home/root# arp -s 192.168.11.122 D4:5D:64:F0:C 0:F6 classcomputers@RT-AC86U-AAA8:/tmp/home/root# arp ? (147.12.206.1) at 48:f8:db:c2:81:24 [ether] on eth0 ? (192.168.11.122) at d4:5d:64:f0:c0:f6 [ether] PERM on br0 classcomputers@RT-AC86U-AAA8:/tmp/home/root#
yes ! but of course, as such, it will not survive a router reboot ...