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 -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
