For me it sounds like that you overthought your idea with network 
scenario. Your setup should be "Xen Case 2: NAT''d
networking". But these
tutorials are someway outdated. What version of Xen do you plan to use? 
And what toolstack (xl, xend, ...)?
Dne 30.11.2012 21:36, dan geci napsal(a):>
> I saw this info http://wiki.kartbuilding.net/index.php/Xen_Networking 
> but it doesn''t cover my issue I don''t think.  I want
several of the
> same Linux OS running on xen from one server(dom0) where dom0 has the 
> one public IP I have available to me.  From there I want to access 
> these VM''s from any where over internet with ssh and once logged
in
> reach the internet via these same machines for tasks like apt-get.  
> The issue is I can''t configure the default gateway to do the
routing
> because someone else owns the network.  I just have permission to put 
> this server in the DMZ and use a pubic IP for it and give it internet 
> access. Basically xen needs to do routing for the vm''s.  
It''s for a
> school work study. I am tasked with giving each student in Unix class 
> their own VM with root permissions that they can log into from 
> anywhere.  And I need apt-get to work on said VM''s for when they
learn
> package installation etc... I''ve never used xen so please be
detailed
> if possible.  Basically I thought xen uses port address translation 
> not just NAT.  In other words if my public IP is 1.1.1.1 then I could 
> map port say 4601 to mean my first VM and 4602 for the second ect... 
> that way I could ssh into them from home with ssh user@1.1.1.1:4601 
> <http://user@1.1.1.1:4601> for the first VM  and so on and  and NAT 
> would use the PAT mappings to send traffic out for tasks like apt-get 
> (the 4601 would point to that particular VM and the xen hyper visor 
> would send the ssh request to that machine via ssh''s normal port
on
> said machine which is 22).  Am I wrong about how this works? If so 
> what is my solution or how do I set up xen to do this?  Or point me to 
> a tutorial on this scenario.
>
>
>
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