GRE header size

As we discussed in Chapter 2, most IP packets have a 20-byte header, with a maximum of 60 bytes b...

IPv4 Version (4-bit) 表示這是IPv4 header(數值為0100) Header Length (4-bit), 最小值是5, 即20-byte , 最大值為15,

Header

The general structure of the IPv4 packet is shown in Figure 7.3. The minimum header (using no opt...

IPv4是一種無連接的協定，操作在使用封包交換的連結層（如乙太網路）上。 ... 首部長度（Internet Header Length， IHL）: 占4bit，首部長度說明首部有多少32位元...