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diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -27,7 +27,7 @@
.\"
.\" From: @(#)ifconfig.8 8.3 (Berkeley) 1/5/94
.\"
-.Dd October 17, 2023
+.Dd November 08, 2023
.Dt IFCONFIG 8
.Os
.Sh NAME
@@ -2870,12 +2870,24 @@
.It Fl syncdev
Stop sending pfsync state synchronisation messages over the network.
.It Cm syncpeer Ar peer_address
-Make the pfsync link point-to-point rather than using
-multicast to broadcast the state synchronisation messages.
-The peer_address is the IP address of the other host taking part in
-the pfsync cluster.
+Set the destination address for the state synchronization messages sent.
+The
+.Ar peer_address
+is normally the IPv4 or IPv6 address of the other host taking
+part in the pfsync cluster.
+.Pp
+When the
+.Ar peer_address
+is set to a unicast IP address, the pfsync link will behave
+as point-to-point rather than using multicast to broadcast the messages.
+.Pp
+When the
+.Ar peer_address
+is set to ff12::f0, the state synchronization
+messages will be broadcast using multicast over IPv6.
.It Fl syncpeer
-Broadcast the packets using multicast.
+Unset the syncpeer.
+Packets will then be broadcast using multicast over IPv4.
.It Cm maxupd Ar n
Set the maximum number of updates for a single state which
can be collapsed into one.
diff --git a/share/man/man4/pfsync.4 b/share/man/man4/pfsync.4
--- a/share/man/man4/pfsync.4
+++ b/share/man/man4/pfsync.4
@@ -24,7 +24,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd October 17, 2023
+.Dd November 08, 2023
.Dt PFSYNC 4
.Os
.Sh NAME
@@ -113,6 +113,25 @@
or specify a peer address and protect the traffic with
.Xr ipsec 4 .
.Pp
+Support for
+.Nm
+transport over IPv6 was introduced in
+.Fx 14.0 .
+To set up
+.Nm
+using multicast with IPv6 link-local addresses, the
+.Ic syncpeer
+must be set to the
+.Nm
+multicast address and the
+.Ic syncdev
+to the interface where
+.Nm
+traffic is expected.
+.Bd -literal -offset indent
+# ifconfig pfsync0 syncpeer ff12::f0 syncdev vtnet0
+.Ed
+.Pp
When new features are introduced to
.Xr pf 4
the format of messages used by

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