CentOS5/6的防火墙叫netfilter,CentOS7/8的防火墙叫firewalld
查看操作系统的版本:
查看防火墙firewalld的版本:
[root@ser1 ~]# firewall-cmd --version
0.6.3
查看区域信息: (默认zone就是 public )
[root@ser1 ~]# firewall-cmd --get-active-zones
public
interfaces: ens33
查看指定网卡接口所属区域:
[root@ser1 ~]# firewall-cmd --get-zone-of-interface=ens33
public
查看firewalld所有打开的服务:
[root@ser1 ~]# firewall-cmd --zone=public --list-services
dhcpv6-client ssh
注释: dhcpv6-client、ssh 是默认就有的,这些服务的默认端口是可以被访问;本机其他服务、端口是默认禁止外部IP地址进行访问的。
查看firewalld所有打开的端口:(虽然看不见TCP 22端口,但因为已经在firewalld的服务里打开了ssh,所以默认是可以访问的)
firewall-cmd --zone=public --list-ports
查看firewalld的当前配置信息:(firewalld的初始状态)
firewall-cmd --list-all
查看firewalld的配置文件:(firewalld的初始状态)
[root@ser1 ~]# cat /etc/firewalld/zones/public.xml
<?xml version="1.0" encoding="utf-8"?>
<zone>
<short>Public</short>
<description>For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.</description>
<service name="ssh"/>
<service name="dhcpv6-client"/>
</zone>
关闭firewalld:
[root@ser1 ~]# systemctl stop firewalld
禁止开机自动启动firewalld:
[root@ser1 ~]# systemctl disable firewalld
启动firewalld:
[root@ser1 ~]# systemctl start firewalld
开机自动启动firewalld:
[root@ser1 ~]# systemctl enable firewalld
######
只允许某个客户端IP地址远程SSH登录本机:
先在firewalld中删除 ssh :
[root@ser1 ~]# firewall-cmd --permanent --zone=public --remove-service=ssh
success
插入防火墙规则:( 只允许IP地址(192.168.168.163)访问本机的TCP 22 端口 )
[root@ser1 ~]#
firewall-cmd --permanent --zone=public --add-rich-rule='rule family="ipv4" source address="192.168.168.163" port protocol="tcp" port="22" accept'
success
重新加载firewalld的配置:
[root@ser1 ~]# firewall-cmd --reload
success
查看firewalld的当前配置信息:
[root@ser1 ~]# firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: ens33
sources:
services: dhcpv6-client
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
rule family="ipv4" source address="192.168.168.163" port port="22" protocol="tcp" accept
查看firewalld的配置文件:
[root@ser1 ~]# cat /etc/firewalld/zones/public.xml
<?xml version="1.0" encoding="utf-8"?>
<zone>
<short>Public</short>
<description>For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.</description>
<service name="dhcpv6-client"/>
<rule family="ipv4">
<source address="192.168.168.163"/>
<port protocol="tcp" port="22"/>
<accept/>
</rule>
</zone>
删除防火墙规则的方法:
[root@ser1 ~]# firewall-cmd --permanent --zone=public --remove-rich-rule='rule family="ipv4" source address="192.168.168.163" port port="22" protocol="tcp" accept'
success
[root@ser1 ~]# firewall-cmd --reload
success
删除防火墙规则的模板:
firewall-cmd --permanent --zone=public --remove-rich-rule='#rich rules#'
查看firewalld的当前配置信息:
[root@ser1 ~]# firewall-cmd --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: ens33
sources:
services: dhcpv6-client
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
######
只允许某个客户端IP网段远程SSH登录本机:
插入防火墙规则:( 只允许网段(192.168.168.0/24)访问本机的TCP 22 端口 )
[root@ser1 ~]# firewall-cmd --permanent --zone=public --add-rich-rule='rule family="ipv4" source address="192.168.168.0/24" port protocol="tcp" port="22" accept'
success
[root@ser1 ~]# firewall-cmd --reload
success
查看firewalld的当前配置信息:
[root@ser1 ~]# firewall-cmd --zone=public --list-all
public (active)
target: default
icmp-block-inversion: no
interfaces: ens33
sources:
services: dhcpv6-client
ports:
protocols:
masquerade: no
forward-ports:
source-ports:
icmp-blocks:
rich rules:
rule family="ipv4" source address="192.168.168.0/24" port port="22" protocol="tcp" accept
查看firewalld的当前配置信息:
[root@ser1 ~]# cat /etc/firewalld/zones/public.xml
<?xml version="1.0" encoding="utf-8"?>
<zone>
<short>Public</short>
<description>For use in public areas. You do not trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.</description>
<service name="dhcpv6-client"/>
<rule family="ipv4">
<source address="192.168.168.0/24"/>
<port protocol="tcp" port="22"/>
<accept/>
</rule>
</zone>
可以在配置文件里修改,然后重新加载firewalld的配置:
[root@ser1 ~]# firewall-cmd --reload
success
相关文章:
CentOS8防火墙(firewalld)
CentOS7_TCP Wrappers |