On Tue, Nov 08, 2011 at 07:11:09PM +0000, David Woodhouse wrote:
> On Tue, 2011-11-08 at 19:54 +0100, Sam Ravnborg wrote:
> > The idea is to use an UDP broadcast to discover all devices,
> > and a similar UDP broadcast to configure the devices.
> > In the latter the MAC will be the key to address individual devices.
>
> You could almost be describing link-local IPv6. Each device
> automatically gets an IPv6 address based on its MAC address, which you
> can use for unicast addressing. The broadcast (or multicast) bit is easy
> enough too.
We are forced to use a IPv4 network where we need to keep the devices
in the same network as a potential router.
So to describe the idea with a little drawing:
Host PC Device-1 Device-2
| | |
|---- DISCOVER----->|----------->|
| | |
|<-- REPLY(MAC:IP)--| |
|<-- REPLY(MAC:IP)---------------|
| | |
(technician manually decide IP setup)
| | |
|-- CONFIG(MAC:IP)->| |
|-- CONFIG(MAC:IP)-------------->|
The discover is maybe sent twice due to packer drops.
The Reply is sent once and may look like this:
MAC=01:02:03:04:05:06;IP=10.11.12.13;NM=255.0.0.0;GW=10.0.0.1;XX="foo
bar";YY="baz buz"
The technician then decides the new config (or computer assisted).
And the CONFIG may look like this:
MAC=01:02:03:04:05:06;IP=192.168.0.201;NM=255.255.255.0;GW=192.168.0.1
I cannot get this with auto-IP or wahtever it is named for IPv4.
Sam
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