Schema:
			
   Aussenstelle                    |		 | Firma
--------------------------------------------------------------------------------------------------------------

							      +-<---------------<--- Intranet -<---+-<->-+- Server
	   ... -<->--+				     	      |			    		   |	 |  (Lotus-Notes, PPS, PDM, ..)
		     |				              |	    		    	           |     |
	Laptop -<->--+- Firewall -<->- Internet <-> Firewall -+-<->- VPNServer -<->- Firewall -<->-+     +- Clients
	             |				     	      |
   Mail-Server -<->--+					      |			  
  (Lotus Notes)      |				      	      +-<->- DMZ-Server (HTTP,FTP,Mail-Server, ...)
	             |
	   ... -<->--+