IPv4 header size

In IPv4 header, the total length field comprises of 16 bits. Total length = Header length + Paylo...

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,

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

Total Length: Length of header + Data (16 bits), which has a minimum value 20 bytes and the maxim...

首部長度（Internet Header Length， IHL）: 占4bit，首部長度說明首部有多少32位元字（4位元組）。由於IPv4首部可能包含數目不定的選項，這個欄位也用來確定資料的偏...