RFC792（国外英文资料）.doc

RFC792（国外英文资料） Organization: China interactive publishing network (/) The RFC document Chinese translation plan (/compters/emook/aboutemook.htm) E-mail:ouyang@ (ggfei ggfei@263.net) Publication date: 2001-3-30 Copyright: this Chinese translation document is copyrighted by China interactive publishing network. It can be reproduced freely in non-commercial use, but the translation and copyright information of this document must be preserved. Network Working Group j. Postel Request for Comments: 792 ISI September 1981, Updates: RFCs 777, 760 Updates: IENs 109, 128 Rfc792-internet control information protocol (ICMP) (RFC792 INTERNET CONTROL MESSAGE PROTOCOL) directory 1. Introduction 2 Message format 2 Aim for information 3 Timeout information 3 The parameter problem message 4 Source congestion message 5 Redirect message 6 Return or return response message 7 Timestamp and timestamp response message 8 The message type summarizes 9 See resources 10 1. Introduction In a system called Catenet, the IP protocol is used as a data service for hosts to the host. Network connection devices are called gateways. These gateways are exchanged for control information through gateways to the gateway protocol (GGP). Typically, the gateway or destination host communicates with the source host, for example, to report errors in the datagram process. For this purpose the ICMP is used, it USES IP as the underlying support, as if it were a high-level agreement, but in fact it is part of the IP, each IP module must implement the ICMP. ICMP message sent in the following cases: when datagrams cannot reach the destination, when the gateway has lost the cache function, when the gateway can guide the host on the more short circuit by sending. IP is not designed to absolutely reliable, the purpose of this agreement is to return to control information, when network problems rather than make IP protocol is absolutely reliable, does not guarantee a datagram or control information to return. Some report