broadcast with unbound adapter

[dunecan]

Hi,

I am trying to broadcast a DHCP Message with unbound adapter (after ipconfig /release) on windows XP SP2.
When I try to send the message, I get the error 10065 (WSAEHOSTUNREACH).
I am trying to send the message using Microsoft Visual C++. I have tried using a RAW socket.
The Message is succesfully sent when an IP address is bound, but I receive 10065 when it is unbound (0.0.0.0).
I have also tried using a Java program, but I get the equivalent error: NoRouteToHostException.

I know it is possible to send such a message, since the Microsoft DHCP Client does it at "ipconfig /renew" after an "ipconfig /release".

Could anyone help me?

 

[mingis]

Just guess. DHCP initial broadcasts should be sent over UDP protocoll, rather than over TCP. Is there possibility to choose between UDP and TCP?

 

[dunecan]

Yes it is possible to choose UDP. I am using UDP.