linux开启和关闭防火墙

#查看防火墙状态
sudo ufw status
#开启防火墙
sudo ufw enable
#关闭防火墙
sudo ufw disable
# 允许/拒绝 访问20端口,20后可跟/tcp或/udp
ufw allow/deny 20
# 允许自10.0.1.0/10的tcp封包访问本机的25端口
ufw allow proto tcp from 10.0.1.0/10 to 本机ip port 25

#查看防火墙状态
systemctl status firewalld
# 开启
sudo service firewalld.service start
# 重启
sudo service firewalld.service restart
# 关闭
sudo service firewalld.service stop

#查看防火墙状态
systemctl status firewalld
# 开启
sudo service firewalld start
# 重启
sudo service firewalld restart
# 关闭
sudo service firewalld stop