August 2000
Intermediate to advanced
896 pages
28h 17m
English
book
UNIX System Administration Handbook, Third Edition
by Scott Seebass, Garth Snyder, Evi Nemeth, Trent R. Hein
Content preview from UNIX System Administration Handbook, Third Edition
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14.1 PACKET FORWARDING: A CLOSER LOOK
Before we jump into the management of routing tables, let’s take a more detailed look at how the tables are used. Consider the network shown in Exhibit A.
Exhibit A Example network
Router R1 connects the two Ethernets, and router R2 connects one of the nets to the outside world. (For now, we’ll assume that R1 and R2 are UNIX computers rather than dedicated routers.) Let’s look at some routing tables and some specific packet forwarding scenarios. First, host A’s routing table:
A% netstat -rnRouting tablesDestination Gateway Flags Refs Use If127.0.0.1 127.0.0.1 UH 6 563131 lo0 ...
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