tailieunhanh - windows server 2008 tcp ip protocols and services microsoft 2008 phần 5

tạo ra các mục trống trong tiêu đề IP rằng các router điền vào các gói di chuyển qua liên mạng IP. Mỗi mục bao gồm địa chỉ IP của router và một dấu thời gian số nguyên 32-bit cho biết số mili giây kể từ nửa đêm, | 172 Part II Internet Layer Protocols The IGMPv3 Host Membership Report message contains the following fields Type A 1-byte field set to 0x22 to indicate an IGMPv3 Host Membership Report message. Reserved A 1-byte field set to 0 by the sender and ignored by the receiver. Checksum A 2-byte field that stores a checksum on the IGMPv3 message. Reserved A 2-byte field set to 0 by the sender and ignored by the receiver. Number Of Group Records A 2-byte field that indicates the number of group records contained in the message. Group Record A variable-sized field that contains a multicast address on which the sending host is listening and either an include list or exclude list of sources. Figure 7-7 shows the structure of an IGMPv3 Host Membership Report message group record. Record Type IIIIIII Auxiliary Data Length IIIIIII Number of Sources IIIIIII IIIIIII Multicast Address IIIIIII IIIIIII IIIIIII IIIIIII Source Address 1 mull num num Source Address n Auxiliary Data IIIIIII IIIIIII IIIIIII IIIIIII num num num num Figure 7-7 The structure of the IGMPv3 Host Membership Report message group record The IGMPv3 Host Membership Report message group record contains the following fields Record Type A 1-byte field that indicates the type of group record and whether the list of sources is an inclusion or exclusion list. Auxiliary Data Length A 1-byte field that indicates the number of bytes of auxiliary data included in the group record. Number Of Sources A 2-byte field that indicates the number of multicast sources contained in the group record. Multicast Address A 4-byte field that indicates the IP address of the group that the host is joining. Source Address A 4-byte field that indicates the unicast IP address of a multicast source. Auxiliary Data A variable-sized field that contains additional data for this group record. Chapter 7 Internet Group Management Protocol IGMP 173 IGMP in Windows Server 2008 and Windows Vista Windows Server 2008 and Windows Vista support IP multicast .