抓包分析获取ip（抓包识报文IP头）
抓包分析获取ip（抓包识报文IP头）Total Length: 52 （0x34）0101 = Header Length: 20 bytes (5)ac d9 0e ce45 00 00 34 0100 .... = Version: 4
抓到的ip头
45 00 00 34
f9 59 40 00
80 06 00 00
c0 a8 7b 4f
ac d9 0e ce
45 00 00 34
0100 .... = Version: 4
0101 = Header Length: 20 bytes (5)
Total Length: 52 （0x34）
f9 59 40 00
Identification: 0xf959 (63833)
Flags: 0x4000 Don't fragment
80 06 00 00
Time to live: 128 （0x80）
Protocol: TCP (6)
Header checksum: 0x0000
c0 a8 7b 4f
Source: 192.168.123.79
ac d9 0e ce
Destination: 172.217.14.206
