Re: [lwip-users] Dose Lwip support broadcast or multicast?

[Frédéric BERNON]

"Yes it does, but broadcast does not work between subnets.  As Simon said this is a 
property of IP, not lwIP."

I'm not really agree with that. Broadcast can be used to communicate between IP subnets as long 
they are on the same "broadcast domain": by example, lwIP device is on 192.168.1.2/24 but 
can exchange (using broadcast address 255.255.255.255) with a PC on 192.168.3.2/24 as long they are 
on the same ethernet network (and as long you don't use VLAN). This kind of communication is often 
used for "discovery" protocols.


Le 30/04/2010 09:55, Kieran Mansley a écrit :
> On Fri, 2010-04-30 at 15:00 +0800, pigeon wrote:
>
>    
> > Does lwIP support broadcast?
> >      
> Yes it does, but broadcast does not work between subnets.  As Simon said
> this is a property of IP, not lwIP.
>
>    
> > If does,,can you give me a example of using broadcast and multicast?
> >      
> Not off the top if my head.
>
> Kieran
>
>
>
>
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