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Chapter 5 RARP Reverse Address Resolution Protocol

2016-09-20 23:02:47   0  举报

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TCP/IP 卷一详解版

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5.1 Introduction

When a system with a local disk is bootstrapped it normally obtains its IP address from a configuration file that's read from a disk file.

5.2 RARP Packet Format

The format of an RARP packet is almost identical to an ARP packet. The only differences are that the frame type is 0X8035 for an RARP request or reply , and the OP file has a value of 3 for an RARP request and 4 for an RARP reply

5.3 RARP Examples

5.4 RARP Server Design

RARP Servers as User Processes

The complication with an RARP server is that the server normally provides the maping from a hardware address to an IP address for many hosts.

Multiple RARP Servers per Network

Another complication is that RARP requests are sent as hardware-level broadcasts , as shown in Figure 5.2 . This means they are not forwarded by routers

5.5 Summary