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

[Jonathan Leslie <>]

the legacy devices are not negotiable. they are fixed, they are themselves a network of several devices, there are hundreds, maybe 1,000's already produced and my customer does not want to discuss any mods to that device. I can do nothing other than send ip address 1.1.1.101 the commands he has listed, and get the responses.  He simply wants to be able to pull any one out of stock, hook it up and have it work. I have no idea what kind of device is handling the 1.1.1.101, could be an fpga, a windows processor, whatever. The customer is always right.  

I also need this accomplished with the ts-7800 with the minimum support hardware.   I picked the ts-7800 because the folks at embedded arm said it had the 4 port and that it ~should~ be do-able.  That's what brought me here.

I can consider adding more NIC cards, but I was hoping that the ts-7800 and debian linux already have that built into the card.   

 

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From: Jason Stahls <>
To:
Sent: Sunday, November 3, 2013 1:39 PM
Subject: Re: [ts-7000] RE: ts-7800 how do I make 4 (at least 2) identical network stacks?

 

On 11/3/2013 1:29 PM, Jonathan Leslie wrote:

"He has two legacy boxes with the same fixed IPs that can't be changed."  

Exactly.   I actually have four legacy boxes with the address 1.1.1.101. I want a C program or programs for the ts-7800 that can individually talk to each of the legacy devices through the 4 ports of the ts-7800.  

So I want to know if on the ts-7800 can I set up 4 IP stacks/SOCK/iptables/whatever  so that I can have a 4 different networks, lets call them A, B, C, and D, all on the same ts-7800. 

so I should be able to have a c program of the sort:

talk_to_legacy_device -n[A|B|C|D] -i[1.1.1.101] -m"message" 

where 

on all 4 networks, I have established that my node is 1.1.1.200.   

when I use talk_to_legacy_device, the -n parameter lets the c program know which of the 4 networks I want to send the message out on, and then also has a listener on that same network for the response from 1.1.1.101.   

eventually I will have 4 background processes all listening on the four different networks, for a communication from their respective 1.1.1.101 legacy system, and signal a command program to format a response and have only that one background process send the reply.   

So can this arrangement be set up on the ts-7800 or not???

Yes it can, I've done something similar with a multi-home'd router, four interfaces, two wan to lan and keep them separate from each other.  Do I remember how?  No :)  I remember lots of iproute2 and iptables reading tho.  Big thing is you'll need either four NIC's on the TS7800, or a VAN capable switch (for size and price a Linux based consumer router like a WRT54 would work) to separate the networks.  You then block the networks for seeing each other (iptables/iproute2) and bind your C app to a specific interface.  -n would be easiest to take a Ethernet interface (eth0, eth0.1, eth1, whatever) instead of a label. 

What do these legacy devices do?  Might it be easier to re-implement them into a single TS7800 ?

--
Jason Stahls

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