[c-nsp] Cisco SSG - tcp redirect

[Buhrmaster, Gary]

It is possible to emulate the SESM functionality using
publically available documentation.  Essentially you
need to create a radius compliant client/server to 
communicate with the IOS SSG process, and a web server
to provide the portal itself.  There is a perl module 
(Net::Radius::SSG) which provides the framework for 
doing a lot of the SSG communication.

> Can a captive portal be implemented only by IOS (SSG) or we 
> need any sort of
> sepcial hardware like SESM ?