我们先通过了解 IPv4 数据包来开始 IP 的学习。 IPv4 datagram format 各个字段的含义为: 其header 一共占 20 字节。和 TCP 协议的 header 大小一样。 4.3.2 IPv4 Datagram Fragmentation 不同的链路层协议的 MTU (maximum transmission unit) 不同。例如,Ethernet 可以支持最多 1500 字节的数据。由于 IP 数据...
Figure 1-3 IPv4 datagram format An IPv4 datagram consists of a header and a data field. The first 20 bytes in the header are mandatory for all IPv4 datagrams. The Options field following the 20 bytes has a variable length. Table 1-4 describes the meaning of each field in an IPv4 datag...
Identification(确定IP同一个数据包) Fragment offset(来确定来一个分片是第一个、第二个) Flags More Fragments(确定无分片) IP数据包的总长度过大,超过链路的最大MTU时,数据包就会被分成多片,而在如今的IPv4的网络中,数据传输时不可靠的,是尽力而为的 IP数据包分片的几个概念: 最大传输单元(MTU):是指由IP...
Types of IPv6 Address: Unicast address: A unique node on a network that typically refers to a single sender or receiver Multicast address: A group of IP devices that can only be used as the destination of a datagram Anycast address: Set of interfaces that belong to different nodes Advantages...
Thanks to the IP, it is easy to set the most suitable structures for packets to transport data until they are delivered. In addition, it includes several methods for addressing, and it routes datagrams across networks. Therefore, the transportation of data packets from their origin to their ta...
The router (which has astatic IP addressthat never changes) assigns a temporary (a.k.a.dynamic) IP address to the device to enable communication. IP converts files intodatagramswith a header (info consisting of IP source/destination and metadata) and the payload (the data itself). ...
IPv4 and IPv6 are internet layer protocols that define packet-switched internetworking, including source-to-destination datagram transmission across multiple networks. These sections describe IPv4 routing and route creation options: Enabling IPv4 Routing Static and Default IPv4 Routes Dynamic IPv4 Routes ...
IPv4 over IPv6 Tunnel Configuration IPv4 Packet Format Figure 1-3 shows the IPv4 packet format. Figure 1-3 IPv4 packet format An IPv4 datagram consists of a header and a data field. The first 20 bytes in the header are mandatory for all IPv4 datagrams. The Options field following the 20...
An IP address identifies a location to which IP datagrams can be sent. An interface can have one primary IP address and multiple secondary addresses. Packets generated by the software always use the primary IPv4 address. Therefore, all networking devices on a...
Two higher-level protocols, Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are used for connection-oriented and connectionless data communication over IP, which we will describe later. Both TCP and UDP use IP for data transmission and are normally referred to as TCP/IP and...