Okay I am unsure what you are trying to do.  What I have done though with my world is the following. 
 
I use minilogin instead of a normal login.  I input the ips of everyone both internally and externally and then when things change people email me and I change them. 
 
I have thought about setting up a webpage that people could use that would get there ip and update the table but it isn't a big deal yet. 
 
Is that what you are trying to do?  Have people both on the outside and inside to connect? 
		
	
		
		
		
		
		
		
		
		
		
	
		
		
	
	
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