I'm trying to write a program that receives DHCP discoveries (UDP) and forwards them on to a given IP address using a different source IP address depending on the content of a specific field (GIADDR) in the DHCP packet. I could get working the receiving and sending bit but I'm having an issue with using as IP source address anything that is not a configured IP address on the local machine. I believe that this can only be done using Raw sockets; is that true ? Are there any examples out there on how to do that in Go ? I've spent a couple of days looking around but could not find much.

Cheers, Sal