Firewall rules between 2 LANs on the same box

Installing and Using OpenWrt
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For people actually looking for help, (and not insults), here is the solution:

nft add table bridge nodhcp
nft add chain bridge nodhcp drop67 { type filter hook prerouting priority 0\; }
nft add rule bridge nodhcp drop67 udp dport { 67, 68 } log prefix \"New DHCP packet dropped: \" drop