sudo ufw allow 80
允许外部访问80端口
 
sudo ufw delete allow 80
禁止外部访问80 端口
 
sudo ufw allow from 192.168.1.1
允许此IP访问所有的本机端口
 
sudo ufw deny smtp
禁止外部访问smtp服务
 
sudo ufw delete allow smtp
删除上面建立的某条规则
 
sudo ufw deny proto tcp from 10.0.0.0/8 to 192.168.0.1 port
要拒绝所有的流量从TCP的10.0.0.0/8 到端口22的地址192.168.0.1

sudo ufw allow from 192.168.31.21 to any port 9000

$ sudo ufw -h
[sudo] password for store: 
ERROR: Invalid syntax

Usage: ufw COMMAND

Commands:
 enable                          enables the firewall
 disable                         disables the firewall
 default ARG                     set default policy
 logging LEVEL                   set logging to LEVEL
 allow ARGS                      add allow rule
 deny ARGS                       add deny rule
 reject ARGS                     add reject rule
 limit ARGS                      add limit rule
 delete RULE|NUM                 delete RULE
 insert NUM RULE                 insert RULE at NUM
 route RULE                      add route RULE
 route delete RULE|NUM           delete route RULE
 route insert NUM RULE           insert route RULE at NUM
 reload                          reload firewall
 reset                           reset firewall
 status                          show firewall status
 status numbered                 show firewall status as numbered list of RULES
 status verbose                  show verbose firewall status
 show ARG                        show firewall report
 version                         display version information

Application profile commands:
 app list                        list application profiles
 app info PROFILE                show information on PROFILE
 app update PROFILE              update PROFILE
 app default ARG                 set default application policy