33 lines
877 B
Markdown
33 lines
877 B
Markdown
|
# Firewall {#sec-firewall}
|
||
|
|
|
||
|
|
NixOS has a simple stateful firewall that blocks incoming connections
|
||
|
|
and other unexpected packets. The firewall applies to both IPv4 and IPv6
|
||
|
|
traffic. It is enabled by default. It can be disabled as follows:
|
||
|
|
|
||
|
|
```nix
|
||
|
|
networking.firewall.enable = false;
|
||
|
|
```
|
||
|
|
|
||
|
|
If the firewall is enabled, you can open specific TCP ports to the
|
||
|
|
outside world:
|
||
|
|
|
||
|
|
```nix
|
||
|
|
networking.firewall.allowedTCPPorts = [ 80 443 ];
|
||
|
|
```
|
||
|
|
|
||
|
|
Note that TCP port 22 (ssh) is opened automatically if the SSH daemon is
|
||
|
|
enabled (`services.openssh.enable = true`). UDP ports can be opened through
|
||
|
|
[](#opt-networking.firewall.allowedUDPPorts).
|
||
|
|
|
||
|
|
To open ranges of TCP ports:
|
||
|
|
|
||
|
|
```nix
|
||
|
|
networking.firewall.allowedTCPPortRanges = [
|
||
|
|
{ from = 4000; to = 4007; }
|
||
|
|
{ from = 8000; to = 8010; }
|
||
|
|
];
|
||
|
|
```
|
||
|
|
|
||
|
|
Similarly, UDP port ranges can be opened through
|
||
|
|
[](#opt-networking.firewall.allowedUDPPortRanges).
|