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diff --git a/share/man/man4/bridge.4 b/share/man/man4/bridge.4
--- a/share/man/man4/bridge.4
+++ b/share/man/man4/bridge.4
@@ -36,7 +36,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd May 5, 2025
+.Dd May 13, 2025
.Dt IF_BRIDGE 4
.Os
.Sh NAME
@@ -163,14 +163,20 @@
should be assigned to the
.Nm
interface itself, not to the bridge's member interfaces.
-Assigning IP addresses to bridge member interfaces is unsupported, but
-for backward compatibility, it is permitted if the
+Attempting to assign an IP address to a bridge member interface, or add
+a member interface with an assigned IP address to a bridge, will return
+an
+.Dv EINVAL
+.Dq ( "Invalid argument" )
+error.
+For compatibility with older releases where this was permitted, setting
+the
.Xr sysctl 8
variable
.Va net.link.bridge.member_ifaddrs
-is set to 1, which is the default.
-In a future release, this sysctl may be set to 0 by default, or may be
-removed entirely.
+to 1 will permit this configuration.
+This sysctl variable will be removed in
+.Fx 16.0.
.Sh IPV6 SUPPORT
.Nm
supports the
diff --git a/sys/net/if_bridge.c b/sys/net/if_bridge.c
--- a/sys/net/if_bridge.c
+++ b/sys/net/if_bridge.c
@@ -507,7 +507,7 @@
VNET_DEFINE_STATIC(bool, member_ifaddrs) = true;
#define V_member_ifaddrs VNET(member_ifaddrs)
SYSCTL_BOOL(_net_link_bridge, OID_AUTO, member_ifaddrs,
- CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(member_ifaddrs), true,
+ CTLFLAG_RW | CTLFLAG_VNET, &VNET_NAME(member_ifaddrs), false,
"Allow layer 3 addresses on bridge members");
static bool

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