■iptableでアクセス制限
IPアドレスで制限
-A MY-FIREWALL -m state --state NEW -m tcp -p tcp --dport 21 -s 202.213.216.201 -j ACCEPT
-A MY-FIREWALL -m state --state NEW -m tcp -p tcp --dport 60000:60030 -s 202.213.216.201 -j ACCEPT
ホスト名で制限
-A MY-FIREWALL -m state --state NEW -m tcp -p tcp --dport 21 -s www.example.com -j ACCEPT
-A MY-FIREWALL -m state --state NEW -m tcp -p tcp --dport 60000:60030 -s www.example.com -j ACCEPT