UDP broadcasting ?

Hi everybody,

We have an embedded system, which is on a network and whose IP address
can be changed using an interface. Now, would it be possible to send UDP
broadcast from another machine and the embedded system to reply, so that
we can know that the system is on the network and know its IP address ?

From what I know, UDP broadcast will only work on the same subnet, but
what if the embedded system is on another subnet?

Loïc Ploumen wrote:

> Hi everybody,
>
> We have an embedded system, which is on a network and whose IP address
> can be changed using an interface. Now, would it be possible to send UDP
> broadcast from another machine and the embedded system to reply, so that
> we can know that the system is on the network and know its IP address ?

Yes, various devices and software have used this for years.

> From what I know, UDP broadcast will only work on the same subnet, but
> what if the embedded system is on another subnet?

Then I would use multicast instead. Multicast was designed to cross routers.

--
Phil Frisbie, Jr.
Hawk Software
http://www.hawksoft.com