Firewall 配置

Posted 2020-09-04

在 CentOS 7
暫時開放 ftp 服務
# firewall-cmd --add-service=ftp

永久開放 ftp 服務
# firewall-cmd --add-service=ftp --permanent

永久關閉
# firewall-cmd --remove-service=ftp --permanent
success

讓設定生效
# systemctl restart firewalld

檢視設定是否生效
# iptables -L -n | grep 21
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0            tcp dpt:21 ctstate NEW

檢查防火牆狀態
# firewall-cmd --state
running

# systemctl stop firewalld
# firewall-cmd --state
not running


# firewall-cmd --list-all
public (default)
  interfaces:
  sources:
  services: dhcpv6-client ftp ssh
  ports:
  masquerade: no
  forward-ports:
  icmp-blocks:
  rich rules:

在 FirewallD 的服務名稱
# firewall-cmd --get-service
amanda-client bacula bacula-client dhcp dhcpv6 dhcpv6-client dns ftp high-availability http https imaps ipp ipp-client ipsec kerberos kpasswd ldap ldaps libvirt libvirt-tls mdns mountd ms-wbt mysql nfs ntp openvpn pmcd pmproxy pmwebapi pmwebapis pop3s postgresql proxy-dhcp radius rpc-bind samba samba-client smtp ssh telnet tftp tftp-client transmission-client vnc-server wbem-https

查詢服務的啟用狀態
# firewall-cmd --query-service ftp
yes
# firewall-cmd --query-service ssh
yes
# firewall-cmd --query-service samba
no
# firewall-cmd --query-service http
no

自行加入要開放的 Port
# firewall-cmd --add-port=3128/tcp --permanent
# firewall-cmd --list-all
public (default)
  interfaces:
  sources:
  services: dhcpv6-client ftp ssh
  ports: 3128/tcp
  masquerade: no
  forward-ports:
  icmp-blocks:
  rich rules:

 

开放地址段

firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 0 -s 192.168.100.1/24 -j ACCEPT

 

 

启用NAT

 

firewall-cmd --permanent --direct --passthrough ipv4  -t nat -A POSTROUTING -s 192.168.100.0/24 -j SNAT --to-source 106.3.226.201

#开启系统路由转发功能 vi /etc/sysctl.conf net.ipv4.ip_forward=1 net.ipv4.conf.all.rp_filter=0 net.ipv4.conf.default.rp_filter=0

 

重启防火墙

firewall-cmd --reload

关闭firewall：

systemctl stop firewalld.service #停止firewall
systemctl disable firewalld.service #禁止firewall开机启动
firewall-cmd --state #查看默认防火墙状态（关闭后显示notrunning，开启后显示running）

 

屏蔽指定IP访问：

firewall-cmd --permanent --add-rich-rule=‘rule family=ipv4 source address="120.132.126.133" drop‘