Re: [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical network stacks?

[Walter Marvin <>]

Won't work. the virtualzation software won't be able to map the routing 
properly. This only adds complexity
--------------------------------------------
On Mon, 11/4/13, John Treen <> wrote:

 Subject: Re: [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical 
network stacks?
 To: 
Date: Monday, November 4, 2013, 7:30 PM
















  



  


    
      
      
      
  
  
     Hi Jonathan,

    

     Have you though about using a virtualisation layer (such
 as User
     Mode Linux) on your board to run multiple instances of
 Linux on your
     board. It is more complicated than the other
 suggestions, but it
     might do what you need.

    

     It has been quite a while since I have used the TS
 boards so
     hopefully the below idea would work with the hardware
 resources you
     have available.

    

     If your board presents each of the Ethernet jacks as a
 separate ethX
     interface to the kernel then for each interface you
 could create a
     TAP/TUN interface and bridge that with the Ethernet
 interface. At
     the host level you wouldn't assign any IP addresses
 to those
     interfaces. You would then create a Guest instance that
 connects to
     the TAP/TUN interface. Inside the guest you would then
 set the IP
     addresses as appropriate.

    

     Basically the host level would be acting as a switch to
 get the
     packets to and from your guest instances. You could then
 either run
     your control software on the guest or if you need to
 present the
     devices back to another network then you could create an
 additional
     TAP/TUN interface for each of your guests with each
 guest having a
     unique IP on the same subnet as the other guests). Then
 at the host
     level you would bridge those TAP/TUN interfaces together
 and also
     give the host a unique IP on the same subnet as the
 guests. If you
     had a spare Ethernet interface you could also bridge
 that in with
     the TAP/TUN interfaces so that the Guest systems could
 be accessed
     from outside of your TS board.

    

     Guest eth0 = IP address used to communicate with
 devices.

     Guest eth1 = IP address used to communicate with other
 guests or
     host

     Host br4 = IP address used to communicate with guests.

    

     I have uploaded a quick diagram to
     http://www.ttech.com.au/files/diagram1.pdf
 to hopefully explain what
     I was talking about above.

    

     Regards,

     John Treen

    

     Treen Technology

    

     On 05/11/13
 08:36, Jonathan Leslie
       wrote:

    
    
       ��
      
          
            
               "BTW, Jonathan, your
                   humongous font is REALLY
 LOUD!"
              

              
              

              
               whoops, I had no idea. -
 J
              

              
              

                
                  
                    
                      
                           From:
                           ""
 <>

                           To:
                           


                           Sent:
                           Monday, November 4, 2013 5:50 PM

                           Subject:
                           RE: Re: [ts-7000] RE: ts-7800 how
 do I make 4
                           (at least 2) identical network
 stacks?

                         
                      

                        
                          
                             ��
                            
                              
                                
                                   ynezz
 said:��
                                  

                                    
                                   "Another
                                       option (requiring more
 hardware
                                       for sure, but more
 feasible) would
                                       be to insert something
 else
                                       between the legacy
 devices and the
                                       8700 which performs
 some NATting."
                                  

                                    
                                   So,
                                       it seems to make even
 more sense
                                       to do this right on
 the TS-8700,
                                       rather than adding
 hardware. All
                                       of the machinery is
 there, just
                                       needs to be
 implemented in
                                     
 software/configuration.
                                  

                                    
                                   This
                                       is getting into
 slightly complex
                                       stuff, so some study
 of iptables
                                       and the types of NAT
 techniques
                                       available will be
 required. The
                                       key element that I see
 is that
                                       iptables rules allow
 you to
                                       specify a network
 interface in
                                       most/many/some
 rules.��
                                  

                                     BTW, Jonathan, your
 humongous font
                                     is REALLY LOUD!
                                  

                                  
                                
                              
                            
                          
                          

                          

                        
                      
                    
                  
                
              
            
          
          
      
      
    
    

  



    
     

    
    






  











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