1iptables-translate -A INPUT -p icmp -m length --length 86:0xffff -j DROP 2nft 'add rule ip filter INPUT ip protocol icmp meta length 86-65535 counter drop' 3 4iptables-translate -A INPUT -p udp -m length --length :400 5nft 'add rule ip filter INPUT ip protocol udp meta length 0-400 counter' 6 7iptables-translate -A INPUT -p udp -m length --length 40 8nft 'add rule ip filter INPUT ip protocol udp meta length 40 counter' 9 10iptables-translate -A INPUT -p udp -m length ! --length 40 11nft 'add rule ip filter INPUT ip protocol udp meta length != 40 counter' 12