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

[Walter Marvin <>]

I'd be happy to do Th IPTables solution for you but I would require payment
--------------------------------------------
On Wed, 11/6/13, Jonathan Leslie <> wrote:

 Subject: Re: [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical 
network stacks?
 To: "" <>
Date: Wednesday, November 6, 2013, 5:34 AM
















  



  


    
      
      
       yeah, that's a
 deal breaker.   I've got the whole interface to
 code up and handle, I need a quick selector switch between
 networks.   Looks like I'm gonna be sticking with
 the winsystems board as multi-IP stacks are simple with
 them.   The Sad part is I bet there is a simple
 solution with the TS-8700 as well, but I don't have
 months to work it out.   Customer wants a quote now for
 48 units too. 



From: Walter Marvin
 <>
  To:
 
  Sent:
 Tuesday, November 5, 2013 10:58 PM
  Subject: Re:
 [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical
 network stacks?
   

  



  


    
      
      
       A full TCP stack is not a trivial exercise, but
 you can steal most of the code, and eliminate most of
 it.Still, its a multi month project and much more work than
 IP routing solutions

 --------------------------------------------

 On Tue, 11/5/13, Jonathan Leslie <>
 wrote:



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

  To: ""
 <>

Date: Tuesday, November 5, 2013, 5:09 PM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

   

 

 

 

   

 

 

     

       

       

        LOL.  I only run

  as root. what about this IP stack, what's the
 difference

  if its running under userspace code or part of the OS?

   Seems like to me you are only changing who owns
 the

  code.   So the ts-8700 has 4

  NIC's???

 

 

 

       

  From:

  "" <>

   To:

  

   Sent:

  Tuesday, November 5, 2013 8:03 PM

   Subject:

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

  network stacks?

    

 

   

 

 

 

   

 

 

     

       

       

        You can use raw ethernet frames to communicate

  over a specific NIC under Linux. However, this imposes
 the

  requirement that any application using that method must
 run

  with root privilege. It also means having to craft a

  substantial portion of an already working IP stack in
 your

  own userspace code. Not trivial.

 

  ---In 

  <> wrote:

 

  when you say raw

  ethernet are you talking sockets connections or
 something

  more "raw" than that?

 

From: Walter Marvin

  <>

   To:

  

   Sent: Tuesday, November

  5, 2013 10:22 AM

   Subject: Re:

   [ts-7000] ts-7800 how do I make 4 (at least 2)
 identical

  network stacks?

    

 

   

 

 

 

   

 

 

     

       

       

        The same effect, however, can be done using raw

  Ethernet on the receiving side

 

  --------------------------------------------

 

  On Mon, 11/4/13, Eric Robishaw <> wrote:

 

 

 

  Subject: Re: [ts-7000] ts-7800 how do I make 4 (at least
 2)

  identical network stacks?

 

   To: ""

  <>

 

Date: Monday, November 4, 2013, 9:08 PM

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

    

 

  

 

  

 

  

 

    

 

  

 

  

 

      

 

        

 

        

 

         Maybe this is too simple... But why not just use

 

   Udp broadcasting, let each device receive all the

  messages

 

   and filter out what they don't need.  No need

  for

 

   special routing, etc..

 

  

 

   On Monday, November 4, 2013, Walter Marvin  wrote:

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

    

 

  

 

  

 

  

 

    

 

  

 

  

 

      

 

        

 

        

 

         The mac address can be easily found. The problem

 

   here is that Linux won't accept the same sub
 network

  on

 

   two different interfaces and the IPs of the remote
 boxes

 

   can't be changed. This has to be handled by routing

 

   below the interface level, or raw Ethernet.

 

  

 

  

 

  

 

  

 

   --------------------------------------------

 

  

 

   On Mon, 11/4/13, Joseph Bouchard <>

  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, 5:39 PM

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

     

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

     

 

  

 

   

 

  

 

   

 

  

 

       

 

  

 

         

 

  

 

         

 

  

 

          Hi,

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

    I've been following along in the background,

  reading

 

  

 

    about half of

 

  

 

   

 

  

 

    what's been said, and understanding less, but I

 

  

 

    haven't seen anyone

 

  

 

   

 

  

 

    suggest this...

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

    Can you use ARP to an advantage here? The normal way

 

  

 

    I've used ARP is

 

  

 

   

 

  

 

    when we have a terminal server which has not yet been

 

  

 

    configured... you

 

  

 

   

 

  

 

    arp the mac address to a hostname on your PC, then

  connect

 

  

 

    to the still

 

  

 

   

 

  

 

    unconfigured box, and configure it.  Your computer

  knows

 

   how

 

  

 

    to find

 

  

 

   

 

  

 

    that remote box by it's mac address, even if the

 

   remote

 

  

 

    box doesn't yet

 

  

 

   

 

  

 

    know what it's IP address is yet.  Can we do that

 

   here?

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

    Imagine this implementation... You have 4 boxes which

  all

 

  

 

    want to have

 

  

 

   

 

  

 

    the same IP address, but they all have different MAC

 

  

 

    addresses, which

 

  

 

   

 

  

 

    I'll refer to MAC1, MAC2, etc.  On your TS7800 you

 

   have

 

  

 

    a plain old

 

  

 

   

 

  

 

    single interface eth0 with the address of your choice,

  and

 

   a

 

  

 

    typical

 

  

 

   

 

  

 

    socket listener.  When a client connects, you
 accept(),

 

   like

 

  

 

    you

 

  

 

   

 

  

 

    normally would.  It's been years since I've

  dealt

 

  

 

    with the addr structs

 

  

 

   

 

  

 

    the sockets use, but I'm thinking there is a way
 to

 

   tie

 

  

 

    a mac address to

 

  

 

   

 

  

 

    the socket, or lacking that use arp.  At that point

  your

 

  

 

    file descriptor

 

  

 

   

 

  

 

    is working correctly and you don't care about IP

 

  

 

    addresses, you are just

 

  

 

   

 

  

 

    talking back and forth op that open socket.

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

    Maybe I've missed some critical detail, but the

  point

 

   is

 

  

 

    when you use

 

  

 

   

 

  

 

    mac addresses, and/or hostnames, and you don't

  worry

 

  

 

    about addresses any

 

  

 

   

 

  

 

    more.

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

    Good luck,

 

  

 

   

 

  

 

    Joe

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

       

 

  

 

        

 

  

 

   

 

  

 

       

 

  

 

       

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

     

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

   

 

  

 

  

 

  

 

      

 

       

 

  

 

      

 

      

 

  

 

  

 

  

 

  

 

  

 

  

 

    

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

      

 

       

 

  

 

      

 

      

 

  

 

  

 

  

 

  

 

  

 

  

 

    

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

  

 

 

 

     

      

 

     

     

 

 

 

 

  

     

                     

                             

 

     

      

 

     

     

 

 

 

 

       

 

     

      

 

     

     

 

 

 

 

 

 

   

 

 

 

 

 

 

 

 

 



    
     

    
    




      

    
     

    
    






  











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