ACL : hosts.allow / hosts.deny 사용하기
hosts.allow 설정
sendmail: all
ALL:127.0.0.1 211.183.90.0/255.255.255.0 211.183.91.0/255.255.255.0 211.233.75.0/255.255.255.224 211.233.10.32/255.255.255.224 211.233.87.224/255.255.255.224 220.127.4.143/255.255.255.255 211.226.38.181 211.183.78.254 211.207.214.33 211.44.28.228 211.183.78.253
sshd: ***.***.***.***
***.***.***.***
***.***.***.***
***.***.***.***
in.telnetd: ***.***.***.***
in.sshd: ***.***.***.***
in.ftpd: ***.***.***.***
in.rshd: ***.***.***.***
in.rlogin: ***.***.***.***
hosts.deny 설정
ALL:ALL