Detecting host in the local network

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From: AndreasSander1@xxxxxxx
Date: Wed, 11 Feb 2009 09:05:58 -0800 (PST)

Hello,

is it possible to detect, if a ethernet device is connected to the
local LAN?

I have a scenario where a Windows CE 5.0 device is connected to a LAN.
There are probably other devices connected to the same physical
network that use a different subnet. I have to decide if the other
device is in the LAN.

Can I access the ARP layer in any way?

The information is required to decided if I should use the limited
broadcast address to send a UDP frame to the other device or a unicast
address that the next gateway will route.

Andreas
.

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