nftables nat tftp

nftables.conf

table ip nat {
        chain prerouting {
                type nat hook prerouting priority dstnat; policy accept;
        }

        chain postrouting {
                type nat hook postrouting priority srcnat; policy accept;
                oifname "eth0" masquerade
        }
}

other commands

tftp helper: modprobe nf_nat_tftp
connection tracking: conntrack -L -o id,extended