Added check_multiple_host_addresses as I stil had that laying around somewhere

README.md

@@ -26,14 +26,48 @@ is indifferent of which version of procps (to date) is used. No other changes
 were made to the script.
 
 
+plugins/plugins/check_multiple_host_addresses
+---------------------------------------------
+This script is a first attempt to monitor multi-home and dual-stack (i.e. ipv4
+and ipv6) servers. In my setup a server should only considered availble if it is
+available on all of its primary addresses (i.e. both ipv4 and ipv6). It uses the
+excellent check_multi script to perform multiple a ping check to see if a host
+is available and reports the consolidated status. Using check_multi has the
+advantage that pnp4nagios and other scripting graphing solutions will support
+this solution as well.
+
+Installation is straightforward, after installing the script on your server, add
+the following to your `commands.cmd` configuration file to make it available:
+~~~
+  # 'check-host-alive' command definition for multi-homed/dual-stack servers
+  define command{
+        command_name    check-addresses-alive
+        command_line    [install_path]/plugins/check_multiplehost_addresses '$HOSTADDRESS$' '$_HOSTADDRESS6$'
+  }
+~~~
+The example above assumes that the IPv6 address of the host is provided as part
+of the host configuration, i.e.:
+~~~
+  define host {
+        ...
+        address         192.168.0.1
+        _address6       fdf8:f340:ab9d:c213::1
+	...
+  }
+~~~
+To use the script either add ` check_command		check-addresses-alive`
+to the specific hosts that should use the check or to the generic host used as
+template.
+
+
 cgi-bin/nagiosstatus.sh
 -----------------------
 Very simplistic CGI-BIN script that checkes whether nagios is still running and
 still updating its status. It wil always return an HTTP Status 200 (OK) and a
 simple text page with one of the following texts:
- - STOPPED - in case the nagios process is not running
- - STALLED - in case the nagios status file has not been updated for 5 minutes
- - OK - when Nagios is running and updated its status file < 5 minutes ago
+ - `STOPPED` - in case the nagios process is not running
+ - `STALLED` - in case the nagios status file has not been updated for 5 minutes
+ - `OK` - when Nagios is running and updated its status file < 5 minutes ago
 
 I wrote this script to be used with an external monitoring system, I use it with
 the free subscription from [Pingdom](http://www.pingdom.com) to get alerts when