Shulou(Shulou.com)06/02 Report--

1. Installation

Apt-get install ufw

two。 Use

Turn on the firewall: ufw enable

Turn off the firewall: ufw disable

View status: ufw status

Open or close a port, for example:

Sudo ufw allow smtp # allows all external IP to access the native 25/tcp (smtp) port

Sudo ufw allow 22/tcp # allows all external IP to access the native 22/tcp (ssh) port

Sudo ufw allow 53 # allows external access to port 53 (tcp/udp)

Sudo ufw allow from 192.168.1.100 # allows this IP to access all native ports

Sudo ufw allow proto udp 192.168.0.1 port 53 to 192.168.0.2 port 53

Sudo ufw deny smtp # prohibits external access to smtp services

Sudo ufw delete allow smtp # delete one of the rules established above

Set the default policy (such as "mostly open" vs "mostly closed")

Ufw default allow | deny

You can specify a service name that exists in / etc/services in the form of "protocol: Port". The 'allow' parameter adds the entry to / etc/ufw/maps, while the' deny' 'parameter does the opposite. The basic syntax is as follows:

Ufw allow | deny [service]

Such as:

Allow smtp port

Sudo ufw allow smtp

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