Various keepalive extensions

Add compatibility aliases for ProtocolKeepAlives and SetupTimeOut, supported
in previous versions of Debian's OpenSSH package but since superseded by
ServerAliveInterval.  (We're probably stuck with this bit for
compatibility.)

In batch mode, default ServerAliveInterval to five minutes.

Adjust documentation to match and to give some more advice on use of
keepalives.

Author: Ian Jackson <ian@chiark.greenend.org.uk>
Author: Matthew Vernon <matthew@debian.org>
Author: Colin Watson <cjwatson@debian.org>
Last-Update: 2016-12-26

Patch-Name: keepalive-extensions.patch

1 files changed, 19 insertions, 2 deletions

diff --git a/ssh_config.5 b/ssh_config.5
index a7703fc77..a0457314c 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -250,8 +250,12 @@ Valid arguments are
 If set to
 .Cm yes ,
 passphrase/password querying will be disabled.
+In addition, the
+.Cm ServerAliveInterval
+option will be set to 300 seconds by default (Debian-specific).
 This option is useful in scripts and other batch jobs where no user
-is present to supply the password.
+is present to supply the password,
+and where it is desirable to detect a broken network swiftly.
 The argument must be
 .Cm yes
 or
@@ -1485,7 +1489,14 @@ from the server,
 will send a message through the encrypted
 channel to request a response from the server.
 The default
-is 0, indicating that these messages will not be sent to the server.
+is 0, indicating that these messages will not be sent to the server,
+or 300 if the
+.Cm BatchMode
+option is set (Debian-specific).
+.Cm ProtocolKeepAlives
+and
+.Cm SetupTimeOut
+are Debian-specific compatibility aliases for this option.
 .It Cm StreamLocalBindMask
 Sets the octal file creation mode mask
 .Pq umask
@@ -1544,6 +1555,12 @@ Specifies whether the system should send TCP keepalive messages to the
 other side.
 If they are sent, death of the connection or crash of one
 of the machines will be properly noticed.
+This option only uses TCP keepalives (as opposed to using ssh level
+keepalives), so takes a long time to notice when the connection dies.
+As such, you probably want
+the
+.Cm ServerAliveInterval
+option as well.
 However, this means that
 connections will die if the route is down temporarily, and some people
 find it annoying.