On Tue, 2011-11-08 at 20:31 +0100, Sam Ravnborg wrote: > 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. Note that to use *link-local* IPv6 you don't need any co-operation from infrastructure. You don't need global routing; you don't need to be generally operating in 21st century conditions. If you have an Ethernet-like link between your devices, link-local IPv6 should work fine. -- dwmw2
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