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Network illustrated tcpip phần 5

Để đảm bảo độ tin cậy, các thủ tục ngập lụt sử dụng một thủ tục xác nhận. Độ tin cậy cũng được xây dựng vào giao thức. Khi một LSA được truyền đi, được công nhận. Một gói tin không thú nhận truyền lại bởi các bộ định tuyến phát hành cho đến khi nó được công nhận. | must still implement tHeir own reliability procedures if reliable communication is required. THe ICMP messages typically report errors in tHe processing of datagrams. To avoid tHe problem of ICMP messages about ICMP messages none are sent. icmp Found in RFC 1885 and originally found in RFC 792. THe functions of ICMP are explained in 1885 but many otHer RFCs are referenced 1970 for NeigHbor Discovery 1191 for PatH MTU Discovery IPv4 extension. Continues to provide some maintenance for an unreliable IPv6. No ICMPv6 messages are sent for ICMPv6 errors. ICMPv6 is used by IPv6 nodes to report errors encountered in processing packets and to perform otHer internet-layer functions sucH as diagnostics ICMPv6 ping and multicast membersHip reporting. ICMPv6 is an integral part of IPv6 and must be fully implemented by every IPv6 node. Previous Table of Contents Next HllKtNltd Illustrated TCP IP TCP IP by Matthew G. Naugle Wiley Computer Publishing John Wiley Sons Inc. ISBN 0471196568 Pub Date 11 01 98 Previous Table of Contents Next Chapter 176 ICMPv6 and ICMPv4 ICMPv6 cleaned up ICMPv4 mainly any control messages that were not used gone from being specifically identified as ICMP messages are timestamp timestamp reply source quench information request and reply . Most of these procedures are incorporated into other protocols. For example source quench is not used anymore for other mechanisms such as TCP slow start and congestion control were found to be more useful. Why put the onus on the routers when a mechanism is better defined and more useful elsewhere Also certain codes for a specific type have been moved or eliminated for example source route failed code for the Destination Unreachable Type . The address fields obviously had to be extended to handle ICMPv6 128-bit addressing. The multicast control functions of IGMP were also included in ICMPv6 to allow for the group membership Query Report and Termination. With all of the changes Just discussed ICMPv6 is not backwards .