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Chapter 6 Neighbor Discovery 127 Type 三2 Length Link-Layer Address wwww... Figure 6-4 The structure of the Target Link-Layer Address option The Source Link-Layer Address option and the Target Link-Layer Address option have the same format The Type field is set to 1 for a Source Link-Layer Address option and 2 for a Target Link-Layer Address option.The Length field is set to the number of 8-byte blocks in the entire option. The Link-Layer Address field is a variable-length field that contains the link-layer address of the source or target.Each link layer defined for IPv6 must specify the way in which the link- layer address is formatted in the Source and Target Link-Layer Address options. For example,RFC 2464 defines how IPv6 packets are sent over Ethernet networks.It also includes the format of the Source and Target Link-Layer Address ND options.For Ethernet. the link-layer address is 48 bits(6 bytes)in length.Figure 6-5 shows the Target Link-Layer Address option for Ethernet. Type =2 Length m=1 Ethernet MAC Address u Figure 6-5 The Target Link-Layer Address option for Ethernet Network Monitor Capture Here is an example of a Source Link-Layer Address option used in a Neighbor Solicitation message as displayed by Network Monitor 3.1(frame 1 of capture 06_0l in the \Network- MonitorCaptures folder on the companion CD-ROM): Frame: Ethernet:Etype IPv6 Ipv6:Next Protocol ICMPv6,Payload Length 32 Icmpv6:Neighbor Solicitation,Target FE80:0:0:0:260:97FF:FE02:6EA5 MessageType:Neighbor Solicitation,135(0x87) NeighborSolicitation: Code:0 (0x0) Checksum:3893 (0xF35) Reserved:0 (0x0) TargetAddress:FE80:0:0:0:260:97FF:FE02:6EA5 SourceLinkLayerAddress: Type:Source Link-Layer Address,1(0x1) Length:1,in unit of 8 octets Address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`abc d2629A=:2T=FBI24G=34567289:;<8=>26?@@62AA4BC94:5A2@9:=Y29D1L4634I979C=C94: F2AA=D2=A@9ABI=>2@L>Y2CR46;e4:9C46fHJ[G6=F2J4G7=BC562gQhgJ9:C12iY2CR46;< e4:9C46W=BC562AG4I@264:C1274FB=:94:WZ<Vje\k lmnopq r stupmvptq stwxpyz{|} r zx|}q ~pt {mtyz{|}
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