iptables -I INPUT -p tcp --dport 21 -m mac ! --mac-source 52:54:00:90:60:d2 -j REJECT
iptables -A INPUT -p tcp --dport 21 -j DROP
create table tbase.ttable1 (
ttable1_id INT AUTO_INCREMENT,
content VARCHAR(255)
);
create table tbase.ttable2 (
ttable2_id INT AUTO_INCREMENT,
text1 VARCHAR(255),
text2 VARCHAR(255),
FOREIGN KEY (text2) REFERENCES tbase.ttable1 (content)
);