.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.\" $OpenBSD: ssh_config.5,v 1.56 2005/06/08 11:25:09 djm Exp $
+.\" $OpenBSD: ssh_config.5,v 1.61 2005/07/08 12:53:10 jmc Exp $
.Dd September 25, 1999
.Dt SSH_CONFIG 5
.Os
The default is
.Dq no .
.It Cm BindAddress
-Specify the interface to transmit from on machines with multiple
-interfaces or aliased addresses.
+Use the specified address on the local machine as the source address of
+the connection.
+Only useful on systems with more than one address.
Note that this option does not work if
.Cm UsePrivilegedPort
is set to
.Nm ssh
will continue without connecting to a master instance.
.Pp
+X11 and
+.Xr ssh-agent 1
+forwarding is supported over these multiplexed connections, however the
+display and agent fowarded will be the one belonging to the master
+connection i.e. it is not possible to forward multiple displays or agents.
+.Pp
Two additional options allow for opportunistic multiplexing: try to use a
master connection but fall back to creating a new one if one does not already
exist.
Specify the path to the control socket used for connection sharing as described
in the
.Cm ControlMaster
-section above.
+section above or the string
+.Dq none
+to disable connection sharing.
In the path,
.Ql %h
will be substituted by the target host name,