High RAM usage on Linux machine

This is something I hear a lot of people get confused about. Unfortunately, even a fair number of reporting tools erroneously report high memory usage when otherwise unused RAM is simply used for caching. For a great explanation from Redhat:

http://kbase.redhat.com/faq/docs/DOC-1139

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Using Software Distributor through a firewall

How to configure SD when a firewall is between the server with the depots and the client.

http://docs.hp.com/en/SD/fwcookbook.html