Extension Headers：为了纠正IPv4 Option Field的局限性，在IP version 6中引入了Extension Headers。扩展报头机制是IPv6体系结构中非常重要的一部分。IPv6固定头的下一个Header字段指向第一个Extension Header，这个第一个Extension Header指向第二个Extension Header，依此类推。 IPv6 数据包可能包含零个、一个或多个...
7、协议类型(Protocol type)转换为下一报文头域(Next Header ),下一个报文头部字段用来标识当前报头(或者扩展报头)的下一个头部类型。 8、总长度域(total length field) 被 载荷长度域 (Payload length)代替,载荷长度是除了IP报文头部的长度不像IPv4里面包括整个头部长度。 9、TTL域(Time to live)变成跳数限制...
The type of information following the basic IPv6 header can be a transport-layer packet, for example, a TCP or UDP packet, or an Extension Header. Hop Limit Similar to the Time to Live field in the IPv4 packet header. The value of ...
The options field in the IPv4 header is used to convey additional information on the packet or on the way it should be processed. Routers, unless instructed otherwise [1], must process the options in the IPv4 header. The processing of most header options pushes the packet into the slow path...
2. Within the IP packet header, what is the value in the upper layer protocol field? 答:the upper layer protocol field is 1 实验结果如下: 3. How many bytes are in the IP header? How many bytes are in the payload of the IP datagram? Explain how you determined the number of payload...
OSPFv3用IPv6报文直接封装协议报文,协议号为89,在IPv6 Next Header里标识。 图3-117协议栈结构 +---+ | OSPF | +---+ | IPv6 Header | +---+ | L2 | +---+ | L1 | +---
9. Upper-Layer 报头 若IPv6 被封装在IPv4 中,则Upper-Layer 报头可以是另一个IPv6 报头,并且可以包含符合相同规则的扩展报头。 Hop-by-Hop Options 报头 Hop-by-Hop Options扩展报头携带着必须由数据包经过路径上的每个节点进行检查的可选信息。它必须紧跟在IPv6 报头后,并由Next Header 值0 表示。例如,Rout...
Header field in the IPv6 basic header indicates the type of the first extension header, that in the first extension header indicates the type of the second extension header, and so on. In the last extension header, the Next Header field indicates the upper-layer protocol type. Table 4-1 ...
header field value of the received datagram. This option allows the ECN bits of the TOS IPv4 header field of the received datagram to be returned in theWSAMSGstructure. The returned message type will be IP_ECN. All 2 ECN bits of the TOS field will be returned. This option is only ...
tclass TCLASS - specifies the traffic class field on tunneled packets, which can be specified as either a two-digit hex value (e.g. c0) or a predefined string (e.g. internet). The value inherit causes the field to be copied from the original IP header. The values inherit/STRING or ...