Hello I want to insert the following statements in a running rule-set and got an error. nft add table raw nft add chain raw prerouting {type filter hook prerouting priority -300\;} nft: invalid option -- '3' A Sample HowToDo I have found here: https://wiki.nftables.org/wiki-nftables/index.php/Mangle_packet_header_fields. How can I insert this new rules in the running rule-set? My Environment: Debian 9 nftables 0.9.0-1~bpo9+1 Thank you and best regards Tom