mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-17 07:13:23 +01:00
39 lines
1.1 KiB
XML
39 lines
1.1 KiB
XML
|
<section xmlns="http://docbook.org/ns/docbook"
|
||
|
|
xmlns:xlink="http://www.w3.org/1999/xlink"
|
||
|
|
xmlns:xi="http://www.w3.org/2001/XInclude"
|
||
|
|
version="5.0"
|
||
|
|
xml:id="sec-firewall">
|
||
|
|
|
||
|
|
<title>Firewall</title>
|
||
|
|
|
||
|
|
<para>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:
|
||
|
|
|
||
|
|
<programlisting>
|
||
|
|
networking.firewall.enable = false;
|
||
|
|
</programlisting>
|
||
|
|
|
||
|
|
If the firewall is enabled, you can open specific TCP ports to the
|
||
|
|
outside world:
|
||
|
|
|
||
|
|
<programlisting>
|
||
|
|
networking.firewall.allowedTCPPorts = [ 80 443 ];
|
||
|
|
</programlisting>
|
||
|
|
|
||
|
|
Note that TCP port 22 (ssh) is opened automatically if the SSH daemon
|
||
|
|
is enabled (<option>services.openssh.enable = true</option>). UDP
|
||
|
|
ports can be opened through
|
||
|
|
<option>networking.firewall.allowedUDPPorts</option>. Also of
|
||
|
|
interest is
|
||
|
|
|
||
|
|
<programlisting>
|
||
|
|
networking.firewall.allowPing = true;
|
||
|
|
</programlisting>
|
||
|
|
|
||
|
|
to allow the machine to respond to ping requests. (ICMPv6 pings are
|
||
|
|
always allowed.)</para>
|
||
|
|
|
||
|
|
</section>
|