Re: [lwip-users] detect IP/UDP destination address

[Kieran Mansley]

On Mon, 2006-12-18 at 10:54 +0100, address@hidden wrote:
> Hi,
> 
> I have set up an UDP-server using the raw API
> 
>     upcb= udp_new();
>     udp_recv( upcb, callback_recv, get_nic_netif() );
>     udp_bind( upcb, IP_ADDR_ANY, 1234 );
> 
> In my callback_recv function I can see the IP address of the UDP-client
> so I can reply to it.
> 
> But........ I would like to detect if the client sent the incoming UDP
> packet using unicast or broadcast (so I can respond with a
> corresponding unicats/broacast packet).
> 
> Is this possible?

Someone may correct me, as I'm not sure about this, but
unicast/broadcast is a rather Ethernet specific concept, and so I'd be
surprised if it was visible at the higher layers as these have to
interoperate on many different physical networks.

Kieran