What do I need to fill in when using IP_HDRINCL

I'm awaiting the arrival of "Linux Network Programming" but in the meantime I thought I'd ask my brothers (and sisters) here for some info. If I have constructed a raw packet structure containing the ethernet header, ip header and tcp/udp/icmp header. What do I actually have to fill in when using the option IP_HDRINCL? At first I thought that I had to do everything but now I understand that 开发者_JAVA百科the src and dest mac addresses of the ethernet header could be handled by the kernel. But what is required that I fill in and what values should the other fields have for the kernel to understand that it should fill those in?

Thanx in advance boys (and girls)!

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You start with the IP header. But set all members of the IP and TCP/UDP frames correctly.

Your assumptions is correct. Don't include the Ethernet header when you send raw IP frames. Usually Ethernet is used as a low level communication, but there are others.