Hi, all, I want to send a UDP packet to another box in the network, I need to reduce the system cost of sending these UDP packets to as low as possible. Now my question is: 1) Is it meaningful to send the UDP packet via raw socket rather than common UDP socket? Because even the UDP software in the network stack do only a little work on the data I write to the UDP socket. 2) If I need to send the UDP packet through the raw socket without the IP_HDRINCL option on, how should I fill in the UDP checksum field of UDP header? The checksum will consider the pesudo header, does it mean I have to construct the pesudo header by myself just for the checksum computation? 3) I find a example of sending UDP packet through raw socket with IP_HDRINCL option set, unfortunately I can not find the *udpiphdr struct* on Linux, neither can I find it in the sample code of this book.(UNIX Network Programming, v1,e2, Figure 26.13). Is this structure system dependent? Thanks in advance and every feedback will be deeply appreciated! ============================================================ Wei Qu Graduate Student, Research Assistant Faculty of Computer Science, Dalhousie University E_Mail: wei@cs.dal.ca Home : http://www.cs.dal.ca/~wei/ ************************************************************ May you have warm words on the cold evening, a full moon on the dark night, and a smooth road all the way to your door. ============================================================ - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
