linux中firewalld几个使用场景

一、基础配置

查看当前配置

# firewall-cmd --get-active-zone 
public
  interfaces: eth0 eth1

改变域

# nmcli c mod eth0 connection.zone internal 
# nmcli c mod eth1 connection.zone external
# firewall-cmd --get-active-zone 
internal
  interfaces: eth0
external
  interfaces: eth1

设置IP伪装

# firewall-cmd --zone=external --add-masquerade --permanent 
success
# firewall-cmd --reload 
success

查看配置

# firewall-cmd --zone=external --query-masquerade 
yes

查看ip转发和ip伪装打开

# cat /proc/sys/net/ipv4/ip_forward 

场景1、本机端口转发

访问本机external网卡的8088端口转发到本机的22号端口

# firewall-cmd --zone=external --add-forward-port=port=8088:proto=tcp:toport=22  --permanent
success
# firewall-cmd --list-all --zone=external 
external (active)
  interfaces: eth1
  sources:
  services: ssh
  ports:
  masquerade: yes
  forward-ports: port=8088:proto=tcp:toport=22:toaddr=
  icmp-blocks:
  rich rules:  

场景2：端口映射

访问防火墙的external网卡eth1的8080端口直接转发到192.168.8.2的http端口

# firewall-cmd --zone=external --add-forward-port=port=8080:proto=tcp:toport=80:toaddr=192.168.8.2 --permanent
# firewall-cmd --list-all --zone=external

场景3：内部服务器通过防火墙上网

设置ip伪装

# firewall-cmd --zone=internal --add-masquerade --permanent 
success
# firewall-cmd --reload 
Success

设置网卡IP的nat

# firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -o eth1 -j MASQUERADE 

设置规则accept

# firewall-cmd --direct --add-rule ipv4 filter FORWARD 0 -i eth0 -o eth1 -j ACCEPT 
# firewall-cmd --direct --add-rule ipv4 filter FORWARD 0 -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT