/etc/hosts.allow

위 두파일을 수정해 줘야 함

_hosts.deny

:#

# hosts.deny    This file describes the names of the hosts which are

                  *not* allowed to use the local INET services, as decided

                   by the '/usr/sbin/tcpd' server.

#

# The portmap line is redundant, but it is left to remind you that

# the new secure portmap uses hosts deny and hosts.allow, in particular

# you should know that NFS uses portmap!

sshd : ALL

_hosts.allow

:#

#

# hosts.allow    This file describes the names of the hosts which are

                   allowed to use the local INET services, as decided

                   by the '/usr/sbin/tcpd' server.

sshd : 222.222.222. :ALLOW -------->특정대역만 허용

sshd : 222.222.222.222 :ALLOW ---->특정 ip만 허용