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Linux Network Administrator Guide, Second EditionA diskless client, however, has virtually no information about itself - except for its Ethernet address! So it broadcasts a message containing a request asking a boot server to provide it with an IP address. There's another protocol for this situation named Reverse Address Resolution Protocol (RARP). Along with the BOOTP protocol, it serves to define a procedure for bootstrapping diskless clients over the network. IP Routing We now take up the question of finding the host that datagrams go to based on the IP address. Different parts of the address are handled in different ways; it is your job to set up the files that indicate how to treat each part. IP Networks When you write a letter to someone, you usually put a complete address on the envelope specifying the country, state, and Zip Code. After you put it in the mailbox, the post office will deliver it to its destination: it will be sent to the country indicated, where the national service will dispatch it to the proper state and region. The advantage of this hierarchical scheme is obvious: wherever you post the letter, the local postmaster knows roughly which direction to forward the letter, but the postmaster doesn't care which way the letter will travel once it reaches its country of destination ...» |
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