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man: mention limit about prefix length when null address is specified to Address=

This commit is contained in:
Yu Watanabe 2019-02-20 19:01:49 +09:00
parent c9207ff3a4
commit e6ef3a130f
1 changed files with 8 additions and 12 deletions
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20
man/systemd.network.xml
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@ -479,18 +479,14 @@
specified more than once.
</para>
<para>If the specified address is 0.0.0.0 (for IPv4) or
[::] (for IPv6), a new address range of the requested size
is automatically allocated from a system-wide pool of
unused ranges. The allocated range is checked against all
current network interfaces and all known network
configuration files to avoid address range conflicts. The
default system-wide pool consists of 192.168.0.0/16,
172.16.0.0/12 and 10.0.0.0/8 for IPv4, and fc00::/7 for
IPv6. This functionality is useful to manage a large
number of dynamically created network interfaces with the
same network configuration and automatic address range
assignment.</para>
<para>If the specified address is <literal>0.0.0.0</literal> (for IPv4) or <literal>::</literal>
(for IPv6), a new address range of the requested size is automatically allocated from a
system-wide pool of unused ranges. Note that the prefix length must be equal or larger than 8 for
IPv4, and 64 for IPv6. The allocated range is checked against all current network interfaces and
all known network configuration files to avoid address range conflicts. The default system-wide
pool consists of 192.168.0.0/16, 172.16.0.0/12 and 10.0.0.0/8 for IPv4, and fd00::/8 for IPv6.
This functionality is useful to manage a large number of dynamically created network interfaces
with the same network configuration and automatic address range assignment.</para>
</listitem>
</varlistentry>