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

[John Treen <>]

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:

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

whoops, I had no idea. - J

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From: m("shaw.ca","bomr");">"" m("shaw.ca","bomr");"><>
To: m("yahoogroups.com","ts-7000");">
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?

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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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