X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/9fa42d41556e6b9a31ca61e782f3c937e900e1fa..e45da4d6928b5f35b9add90897665eaec43ac108:/ssh_config.5

diff --git a/ssh_config.5 b/ssh_config.5
index 42eefa03..13cdee88 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -34,7 +34,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh_config.5,v 1.53 2005/05/20 11:23:32 jmc Exp $
+.\" $OpenBSD: ssh_config.5,v 1.64 2005/10/30 08:43:47 jmc Exp $
 .Dd September 25, 1999
 .Dt SSH_CONFIG 5
 .Os
@@ -136,8 +136,9 @@ or
 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
@@ -193,14 +194,17 @@ The supported ciphers are
 .Dq aes128-ctr ,
 .Dq aes192-ctr ,
 .Dq aes256-ctr ,
+.Dq arcfour128 ,
+.Dq arcfour256 ,
 .Dq arcfour ,
 .Dq blowfish-cbc ,
 and
 .Dq cast128-cbc .
 The default is
 .Bd -literal
-  ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,
-    aes192-cbc,aes256-cbc''
+  ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,
+    arcfour256,arcfour,aes192-cbc,aes256-cbc,aes128-ctr,
+    aes192-ctr,aes256-ctr''
 .Ed
 .It Cm ClearAllForwardings
 Specifies that all local, remote and dynamic port forwardings
@@ -259,8 +263,10 @@ with
 set to
 .Dq no
 (the default).
-These sessions will reuse the master instance's network connection rather
-than initiating new ones.
+These sessions will try to reuse the master instance's network connection
+rather than initiating new ones, but will fall back to connecting normally
+if the control socket does not exist, or is not listening.
+.Pp
 Setting this to
 .Dq ask
 will cause
@@ -275,17 +281,70 @@ If the
 can not be opened,
 .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.
+These options are:
+.Dq auto
+and
+.Dq autoask .
+The latter requires confirmation like the
+.Dq ask
+option.
 .It Cm ControlPath
-Specify the path to the control socket used for connection sharing.
-See
+Specify the path to the control socket used for connection sharing as described
+in the
 .Cm ControlMaster
-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,
+.Ql %p
+the port and
+.Ql %r
+by the remote login username.
+It is recommended that any
+.Cm ControlPath
+used for opportunistic connection sharing include
+all three of these escape sequences.
+This ensures that shared connections are uniquely identified.
 .It Cm DynamicForward
 Specifies that a TCP/IP port on the local machine be forwarded
 over the secure channel, and the application
 protocol is then used to determine where to connect to from the
 remote machine.
-The argument must be a port number.
+.Pp
+The argument must be
+.Sm off
+.Oo Ar bind_address : Oc Ar port .
+.Sm on
+IPv6 addresses can be specified by enclosing addresses in square brackets or
+by using an alternative syntax:
+.Oo Ar bind_address Ns / Oc Ns Ar port .
+By default, the local port is bound in accordance with the
+.Cm GatewayPorts
+setting.
+However, an explicit
+.Ar bind_address
+may be used to bind the connection to a specific address.
+The
+.Ar bind_address
+of
+.Dq localhost
+indicates that the listening port be bound for local use only, while an
+empty address or
+.Sq *
+indicates that the port should be available from all interfaces.
+.Pp
 Currently the SOCKS4 and SOCKS5 protocols are supported, and
 .Nm ssh
 will act as a SOCKS server.