IPv4协议头中没有类似于IPv6中的next header字段，因此无法像IPv6一样将next header=59表示没有下一个协议头。在IPv4中，如果没有下一个协议头，则协议字段的值为。这意味着IPv4数据包没有封装任何高层协议，只包含IP头。因此，如果要在IPv4中表示没有下一个协议头，则需要将协议字段设置为。IPV4和IPV6报文头部...
The format of the IPv4 header field is the same as the header of an IPv4 packet, and the format of the IPv6 header field in IPv6 in IP (6to4) packet is the same as the header of an IPv6 packet. For details, see IPv4 Packet Format and IPv6 Packet Format. Packet Example Figur...
The format of the IPv4 header field is the same as the header of an IPv4 packet, and the format of the IPv6 header field in IPv6 in IP (6to4) packet is the same as the header of an IPv6 packet. For details, see IPv4 Packet Format and IPv6 Packet Format. Packet Example Figure ...
1.Version(4位)用来表明IP协议版本,如果是IPv4协议,为0100(也就是十进制的4) 2.IHL(Internet Header Length)来记录头部的总长度。 3.Type of Service 服务类型。Type of Service最初是用来给IP包分优先级,比如语音通话需要实时性,所以它的IP包应该比Web服务的IP包有更高的优先级。后来,Type of Service被实...
Although the IPv6 address size is four times that of IPv4 addresses, the size of basic IPv6 headers is only twice that of IPv4 headers (excluding the Options field). For the specific IPv6 header format, see Figure 1-1. Figure 1-1 Comparison between IPv4 header format and IPv6 header ...
4.3.1 IPv4 Datagram Format 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 150...
Packet format An IPv4 packet header has an optional field (Options), which includes Security, Timestamp, and Record Route options. The variable length of the Options field results in an IPv4 packet header length range of 20 bytes to 60 bytes. IPv4 packets often need to be forwarded by inter...
Next Header:下一报文头,用来标识IPv6扩展报文头的信息; Hop Limit:跳数限制,与IPv4中的TTL类似; Source Address:源IP地址; Destination Address:目的IP地址; Extension Headers:扩展报文头信息。 相比较IPv4的报文格式,IPv6的报文格式比较简单,根本原因是IPv6报文格式中引入了IPv6扩展报文头的概念。
IPv4 is a 32-bit IP address IPv4 is a numeric address separated by a dot There are 12 header fields, and the length of each header field is 20 IPv4 supports Virtual Length Subnet Mask (VLSM) IPv4 maps to the MAC address of a network card using the Post Address Resolution Protocol Advan...
The IPv4 is a 32-bit address, whereas IPv6 is a 128-bit hexadecimal address. IPv6 provides a large address space, and it contains a simple header as compared to IPv4. It provides transition strategies that convert IPv4 into IPv6, and these strategies are as follows: Dual stacking: It ...