1 Introduction 所谓的InternetWorking就是将很多网络连接起来,那么在这种连接的网络下我们该如何传送封包呢? 2 IP and Routers 1 IP Datagram Header Format IP Address:目前IP地址均是32个bit,称为IPV4.未来会使用IPV6,128个bit. Identification:Router本身将封包收下来,经过查表后,会将封包从某一个网络或者说port转发出去,但是Router周围的网络是不同的(例如从Ethern…

30.13 Summary Network management protocols allow a manager to monitor and control routers and hosts. A network management client program executing on the manager's workstation contacts one or more servers, called agents, running on the devices to be…

1.介绍 Socket编程让你沮丧吗?从man pages中很难得到有用的信息吗?你想跟上时代去编Internet相关的程序,但是为你在调用 connect() 前的bind() 的结构而不知所措?等等- 好在我已经将这些事完成了,我将和所有人共享我的知识了.如果你了解C语言并想穿过网络编程的沼泽,那么你来对地方了. 2.读者对象 这个文档是一个指南,而不是参考书.如果你刚开始socket编程并想找一本入门书,那么你是我的读者.但这不是一本完全的 socket 编程书. 3.平台和编译器 这篇文…

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30.12 New Features In SNMPv3 We said that version 3 of SNMP represents an evolution that follows and extends the basic framework of earlier versions. The primary changes arise in the areas of security and administration. The goals are twofold. First,…

30.11 Example Encoded SNMP Message The encoded form of ASN.1 uses variable-length fields to represent items. In general, each field begins with a header that specifies the type of object and its length in bytes. For example, each SEQUENCE begins with…

30.9 Simple Network Management Protocol Network management protocols specify communication between the network management client program a manager invokes and a network management server program executing on a host or router. In addition to defining…

30.10 SNMP Message Format Unlike most TCP/IP protocols, SNMP messages do not have fixed fields. Instead, they use the standard ASN.1 encoding. Thus, a message can be difficult for humans to decode and understand. After examining the SNMP message defi…

30.7 Formal Definitions Using ASN.1 The SMI standard specifies that all MIB variables must be defined and referenced using ISO's Abstract Syntax Notation 1 (ASN.13). ASN.1 is a formal language that has two main features: a notation used in documents…

30.8 Structure And Representation Of MIB Object Names We said that ASN.1 specifies how to represent both data items and names. However, understanding the names used for MIBvariables requires us to know about the underlying namespace. Names used for M…