1 files changed, 51 insertions, 21 deletions
diff --git a/sbin/ifconfig/ifconfig.8 b/sbin/ifconfig/ifconfig.8
index b580191383b3..fafb77e1ca6c 100644
--- a/sbin/ifconfig/ifconfig.8
+++ b/sbin/ifconfig/ifconfig.8
@@ -28,7 +28,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 10, 2025
+.Dd September 12, 2025
 .Dt IFCONFIG 8
 .Os
 .Sh NAME
@@ -36,7 +36,7 @@
 .Nd configure network interface parameters
 .Sh SYNOPSIS
 .Nm
-.Op Fl j Ar jail
+.Op Fl j Ar jid
 .Op Fl DkLmn
 .Op Fl f Ar type Ns Cm \&: Ns Ar format
 .Ar interface
@@ -50,11 +50,11 @@
 .Oc
 .Op Ar parameters
 .Nm
-.Op Fl j Ar jail
+.Op Fl j Ar jid
 .Ar interface
 .Cm destroy
 .Nm
-.Op Fl j Ar jail
+.Op Fl j Ar jid
 .Fl a
 .Op Fl dDkLmuv
 .Op Fl f Ar type Ns Cm \&: Ns Ar format
@@ -64,16 +64,16 @@
 .Nm
 .Fl C
 .Nm
-.Op Fl j Ar jail
+.Op Fl j Ar jid
 .Fl g Ar groupname
 .Nm
-.Op Fl j Ar jail
+.Op Fl j Ar jid
 .Fl l
 .Op Fl du
 .Op Fl g Ar groupname
 .Op Ar address_family
 .Nm
-.Op Fl j Ar jail
+.Op Fl j Ar jid
 .Op Fl dkLmuv
 .Op Fl f Ar type Ns Cm \&: Ns Ar format
 .Sh DESCRIPTION
@@ -257,22 +257,22 @@ Setting
 to
 .Cm all
 selects all interfaces.
-.It Fl j Ar jail
-Perform the actions inside the
-.Ar jail .
+.It Fl j Ar jid
+Perform the actions inside the jail specified by
+.Ar jid ,
+which may be either a jail name or a numeric jail ID.
 .Pp
 The
-.Cm ifconfig
-will first attach to the
-.Ar jail
-(by jail id or jail name) before performing the effects.
-.Pp
-This allow network interfaces of
-.Ar jail
-to be configured even if the
-.Cm ifconfig
-binary is not available in
-.Ar jail .
+.Nm
+utility will attach to the specified jail immediately upon
+encountering the option on the command line.
+The option may be specified multiple times to attach to a nested jail
+(jail within a jail).
+.Pp
+This makes it possible to configure network interfaces within a vnet
+jail even if the
+.Nm
+binary is not available inside the jail.
 .It Fl k
 Print keying information for the
 .Ar interface ,
@@ -1004,6 +1004,36 @@ Set a flag to disable Duplicate Address Detection.
 .It Cm -no_dad
 Clear a flag
 .Cm no_dad .
+.It Cm stableaddr
+Set a flag to create SLAAC addresses using a stable algorithm according to RFC 7217
+The
+.Xr sysctl 8
+variable
+.Va net.inet6.ip6.use_stableaddr
+controls whether this flag is set by default or not for newly created interfaces.
+To get consistent defaults for interfaces created at boot it should be set as a tunable via loader.conf(8).
+The
+.Xr sysctl 8
+variable
+.Va net.inet6.ip6.stableaddr_maxretries
+sets the maximum number of retries to generate a unique IPv6 address to be performed in case of DAD failures.
+This defaults to 3 which is also the reccommended minimum value.
+The interface ID source can be configured using the
+.Xr sysctl 8
+variable
+.Va net.inet6.ip6.stableaddr_netifsource:
+.Bl -tag -compact
+.It Cm 0
+uses the interface name string (the default)
+.It Cm 1
+uses the interface ID
+.It Cm 2
+uses the MAC address of the interface (if one can be obtained for it)
+.El
+.Pp
+.It Cm -stableaddr
+Clear the flag
+.Cm stableaddr .
 .El
 .Ss IPv6 Parameters
 The following parameters are specific for IPv6 addresses.