Hello, In NFTables, I have created a named set called 'bar' in the chain input in the table foo. I can add elements to the set manually, # nft add element ip foo bar { 192.168.2.2 } However, I am not able to guess the syntax to have a regular NFTables rule do the appending automatically. I've tried a lot of permutations of the following, but always with fatal errors, # nft add rule foo input tcp dport 22 counter add @bar { ip saddr } Error: Could not process rule: Operation not supported add rule foo input tcp dport 22 counter add @bar { ip saddr } # nft add rule foo input tcp dport 22 add element @bar { ip saddr } Error: syntax error, unexpected element, expecting @ or '$' add rule foo input tcp dport 22 add element @bar { ip saddr } What would be the correct syntax to have a rule which automatically adds a source IP address to the named set when certain conditions are met? /Lars