sniffer製作------IP TCP UDP結構

 IPV4頭結構:

4	8	16		32 bits
Ver.	IHL	Type of service		Total length
Identification				Flags	Fragment offset
Time to live		Protocol		Header checksum
Source address
Destination address
Option + Padding
Data
IP header structure

IPV6 頭結構:

4	4	16	24	32 bits
Ver.	Priority	Flow label
Payload length			Next header	Hop limit
Source address (128 Bits)
Destination address (128 bits)
IPv6 header structure

  TCP 頭結構:

16								32 bits
Source port								Destination port
Sequence number
Acknowledgement number
Offset	Resrvd	U	A	P	R	S	F	Window
Checksum								Urgent pointer
Option + Padding
Data
TCP header structure

 

UDP頭結構:

16	32 bits
Source port	Destination port
Length	Checksum
Data
UDP header structure

 參考文獻:1. http://www.cnblogs.com/davidlili/archive/2006/08/29/489918.html

                  2. http://hi.baidu.com/cuiyubing/blog/item/aff01cfaebbb789659ee90c0.html

                  3. http://blog.youkuaiyun.com/zy122/archive/2007/01/04/1473850.aspx