Udp socket, IpAddress.ANY broadcasts and remote endpoints

[Yage]

Hi, im developing a small app in compact framework. This app sends Udp
broadcasts to 0.0.0.0 (this is needed because the machine can be in
multiple subnets and broadcasts need to be sent to each one),
broadcasts are sent and received as expected, but, when i receive them
(using UdpClient.Receive(ref IPEndPoint)) the endpoint is filled with
the primary network address of the sender, not with the address
associated with the subnet which actually routed the message.
I mean, i have a machine with this ips:
192.168.11.1 (broadcast 192.168.11.255)
192.168.10.1 (broadcast 192.168.10.255)
If this machine sends broadcasts messages to 0.0.0.0 both machines in
192.168.11.0 /24 and those in 192.168.0.10.1 will receive the message,
but, every datagram will appear as originated by 192.168.11.1 (and not
by the correct address). So its not possible for machines in second
subnet to answer.
Is there any way to solve this? or is there any function which lists
available broadcasts so i can send a packet for each broadcast
address?
Tnx in advance.