Dear All, I am novice to nftables and trying to use it as a firewall. I have created few basic rules as follows. nft add table ip mangle nft add chain ip mangle PREROUTING { type filter hook prerouting priority 0; policy accept; } nft add set mangle myset {type ipv4_addr; flags constant, interval;} nft add rule ip mangle PREROUTING ip saddr @myset meta mark set 205 I did not get any error while adding above rules. But I am getting Device or resource busy error when I am trying to add elements into set names "myset" dynamically. I am using following command to add elements into the set. nft add element mangle myset { 192.168.1.8 } So I kindly request all to guide me regarding the same. Regards, Ninad. -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html