== Details ==

I've censored certain details in the description below both to prevent issues with security and to make things somewhat easier to understand.  A description of each detail parameter is listed in the table below.  For single permanent values, I've used all caps, and for example parameters, I've used the @TEMP_FILE@ convention.

|| DMZ_HOST || Public internet connected computer that shields the computing nodes. ||
|| SEC_HOST || Secure internal front end to the computing nodes.  Located beyond DMZ_HOST. ||
|| DMZ_DN   || Full domain name for the DMZ_HOST ||
|| USERNAME || Cluster username ||

== Logging in ==

To reduce the number of login/password authorizations, it's recommended to use the ControlMaster ssh parameters.  This requires only the first connection to be validated, as subsequent connections are passed through the already validated connection.  The .ssh/config options to implement this are:

{{{
Host DMZ_HOST
  User          USERNAME
  Hostname      DMZ_DN
  ForwardX11    yes
  ForardAgent   yes
  RequestTTY    force
  ControlMaster auto
  ControlPath   ~/.ssh/connections/%h_%p_%r
}}}

The ~/.ssh/connections/ directory needs to be created if it does not already exist.  With this configuration in place, you can log in to the computing front end with {{{ssh -t DMZ_HOST ssh SEC_HOST}}}.  The DMZ_HOST does not support commands other than ssh and scp, and is used only to bounce the connection to SEC_HOST.

==