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

[beach . dk]

On 12/18/06, Kieran Mansley <address@hidden> wrote:
> 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

Maybe I was a bit careless with my vocabulary if unicast/broadcast is
only related to the ethernet layer.
It's the destination adress at the IP-layer (not ethernet layer) I'm
interested in.

/Beach/