DNS分离解析
配置DNS的配置文件

vim /etc/named.conf
options {
        listen-on port 53 { 192.168.230.128; };
        directory       "/var/named"; 
        allow-query  { "any"; };
};

acl "neiwang" { 192.168.230.130; };//一般用网段
acl "waiwang" { 192.168.230.128; };
view"neiwang"{
        match-clients { "neiwang"; };
        zone "qq.com"  IN  {
                type master ;
                file "qq1.com";
                notify yes;
};
};
view"waiwang"{
        match-clients { "waiwang"; };
        zone "qq.com"  IN  {
                type master ;
                file "named.qq.com";
                notify yes;
};
};

编辑qq1.com与named.qq.com文件

vim /var/named/named.qq.com
$TTL    1D
@       IN      SOA     @       admin.admin.com.        ( 2020071501  1M  3M  1M  1M )
        IN      NS      dns.qq.com.
dns     IN      A       192.168.230.128
www     IN      A       192.168.230.111
aaa     IN      A       192.168.230.100
bbb     IN      A       192.168.230.110


vim /var/named/qq1.com
$TTL    1D
@       IN      SOA     @       admin.admin.com.        ( 2020071401  1M  3M  1M  1M )
        IN      NS      dns.qq.com.
dns     IN      NS      192.168.230.130
www     IN      A       192.168.230.150

关闭上面两台IP（128，130）主机的防火墙和selinux
开启/重启服务
使用nslookup测试结果


公钥验证
编辑sshd_config文件

vim /etc/ssh/sshd_config
Port 22   #取消注释
#获取密钥
ssh-keygen -t RSA
#发送公钥给另外一台主机
ssh-copy-ip -i  192.168.230.130

结果图（第一次远程连接需要输入密码）