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I did a little testing and you are right that packets pass the firewall. However the packets are not raw, at least the values in the fields show IP protocol, udp port 67 and 68. Check the capture file that I got http://rapidshare.com/files/415207204/dhcp_c.pcap.html
I had captured dhcp packets many times, this is why I argued with you about packets being udp and not raw. I don’t understand the way that dhcp client is programmed, but I accept the explanation that you have given from the links. My question is the following though; what will happen if isc-dhcpc tries to acquire IP address from another server, such as cisco or microsoft? Does it still send raw or udp?