Caching Radius Service?

[Nick Bright]

I'm sorry if this has been asked a billion times, which I'm sure it probably has. I reviewed the website and FAQ, as 
well as searching the site with google, but I was unable to locate any refrences as to the ability of FreeRADIUS to 
function as a caching radius server, such that in a pure proxy configuration if it cannot reach the proxy for a relm it 
will use the last known answer for the user attempting to authenticate?

Thanks in advance for any information.
 - Nick Bright
   Terraworld, Inc
   http://home.terraworld.net
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