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doc: mention ProxyNeighbor= in man and NEWS

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Yu Watanabe committed 2026-08-17 17:19:09 +09:00
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NEWS
+3 -6
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@@ -79,12 +79,9 @@ CHANGES WITH 262:
Changes in systemd-networkd:
* A new IPv4ProxyARPAddress= setting has been added to the [Network]
section of .network files. It is the IPv4 counterpart to
IPv6ProxyNDPAddress= and allows manual entries to be added to the
kernel's IPv4 neighbor proxy table. The setting implies
IPv4ProxyARP=yes but has no effect if IPv4ProxyARP= has been set to
false. This mirrors the behavior of IPv6ProxyNDPAddress=.
* The IPv6ProxyNDPAddress= setting in the [Network] section of .network
files has been renamed to ProxyNeighbor=. The setting can now also be
used to add IPv4 addresses to the kernel's IPv4 neighbor proxy table.
Changes in various tools:
man/systemd.network.xml
+10 -27
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@@ -1150,25 +1150,6 @@ DuplicateAddressDetection=none</programlisting></para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPv4ProxyARPAddress=</varname></term>
<listitem>
<para>An IPv4 address, for which ARP requests will be proxied. This option may be specified
more than once. <command>systemd-networkd</command> will add the
<varname>IPv4ProxyARPAddress=</varname> entries to the kernel's IPv4 neighbor proxy table.
When <varname>IPv4ProxyARP=</varname> is unset, this setting implies
<varname>IPv4ProxyARP=yes</varname>: the per-interface <literal>proxy_arp</literal> sysctl
is enabled automatically, which also activates automatic proxy ARP for every address the
interface has a route toward on connected subnets, in addition to answering the listed
entries. If <varname>IPv4ProxyARP=</varname> has been set to false, the
<varname>IPv4ProxyARPAddress=</varname> entries listed here are discarded and not
programmed into the kernel. This mirrors the behaviour of
<varname>IPv6ProxyNDPAddress=</varname>/<varname>IPv6ProxyNDP=</varname>.</para>
<xi:include href="version-info.xml" xpointer="v262"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>IPv6ProxyNDP=</varname></term>
<listitem>
@@ -1188,16 +1169,18 @@ DuplicateAddressDetection=none</programlisting></para>
</varlistentry>
<varlistentry>
<term><varname>IPv6ProxyNDPAddress=</varname></term>
<term><varname>ProxyNeighbor=</varname></term>
<listitem>
<para>An IPv6 address, for which Neighbour Advertisement messages will be proxied. This
option may be specified more than once. <command>systemd-networkd</command> will add the
<varname>IPv6ProxyNDPAddress=</varname> entries to the kernel's IPv6 neighbor proxy table.
This setting implies <varname>IPv6ProxyNDP=yes</varname> but has no effect if
<varname>IPv6ProxyNDP=</varname> has been set to false. When unset, the kernel's default will
be used.</para>
<para>Takes an IPv4 or IPv6 address for which ARP requests or Neighbour Advertisement messages will
be proxied. This option may be specified more than once. <command>systemd-networkd</command> will
add the specified address to the kernel's neighbour proxy table. For an IPv4 address, a proxy ARP
entry will be added. For an IPv6 address, a proxy NDP entry will be added. When an IPv6 address is
specified, <varname>IPv6ProxyNDP=yes</varname> is implied. If <varname>IPv6ProxyNDP=</varname> is
explicitly disabled, IPv6 addresses specified with <varname>ProxyNeighbor=</varname> are ignored.
Note, unlike IPv6, specifying an IPv4 address does <emphasis>not</emphasis> imply
<varname>IPv4ProxyARP=</varname>.</para>
<xi:include href="version-info.xml" xpointer="v233"/>
<xi:include href="version-info.xml" xpointer="v262"/>
</listitem>
</varlistentry>