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man/systemd.netdev: clarify the wireguard AllowedIPs= setting

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`AllowedIPs=` only affects "routing inside the network interface
itself", as in, which wireguard peer packets with a specific destination
address are sent to, and what source addresses are accepted from which
peer.

To cause packets to be sent via wireguard in first place, a route via
that interface needs to be added - either in the `[Routes]` section on
the `.network` matching the wireguard interface, or outside of networkd.

This is a common cause of misunderstanding, because tools like wg-quick
also add routes to the interface. However, those tools are meant as a
"extremely simple script for easily bringing up a WireGuard interface,
suitable for a few common use cases (from their manpage).

Networkd also should support other usecases - like setting AllowedIPs to
0.0.0.0/0 and ::/0 and having a dynamic routing protocol setting more
specific routes (or the user manually setting them).

Reported-In: https://github.com/systemd/systemd/issues/14176
This commit is contained in:
Florian Klink 2020-12-20 18:24:05 +01:00 committed by Yu Watanabe
parent 94d982bb6a
commit c6b90e5c5e
1 changed files with 10 additions and 3 deletions
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13
man/systemd.netdev.xml
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@ -1629,9 +1629,16 @@
<listitem>
<para>Sets a comma-separated list of IP (v4 or v6) addresses with CIDR masks
from which this peer is allowed to send incoming traffic and to
which outgoing traffic for this peer is directed. The catch-all
0.0.0.0/0 may be specified for matching all IPv4 addresses, and
::/0 may be specified for matching all IPv6 addresses. </para>
which outgoing traffic for this peer is directed.</para>
<para>The catch-all 0.0.0.0/0 may be specified for matching all IPv4 addresses,
and ::/0 may be specified for matching all IPv6 addresses.</para>
<para>Note that this only affects "routing inside the network interface itself",
as in, which wireguard peer packets with a specific destination address are sent to,
and what source addresses are accepted from which peer.</para>
<para>To cause packets to be sent via wireguard in first place, a route needs
to be added, as well - either in the <literal>[Routes]</literal> section on the
<literal>.network</literal> matching the wireguard interface, or outside of networkd.
</para>
</listitem>
</varlistentry>
<varlistentry>