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vi /etc/hosts.allow

 

# hosts.allow This file contains access rules which are used to

# allow or deny connections to network services that

# either use the tcp_wrappers library or that have been

# started through a tcp_wrappers-enabled xinetd.

#

# See 'man 5 hosts_options' and 'man 5 hosts_access'

# for information on rule syntax.

# See 'man tcpd' for information on tcp_wrappers

#下面为允许通过制定ip访问服务器

sshd:xxx.xxx.xxx.xxx:allow

sshd:xxx.xxx.xxx.xxx:allow

sshd:172.16.0.0/255.255.0.0:allow

sshd:192.168.0.0/255.255.0.0:allow