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developer.com - Reference UP BROADCAST RUNNING MTU 1500 Metric 1 RX packets:0 errors:0 dropped:0 overruns:0 TX packets:0 errors:0 dropped:0 overruns:0 You may have noticed in the output from the command that the broadcast address was set based on the local machine's IP address. This is used by TCP/IP to access all machines on the local area network at once. The Message Transfer Unit (MTU) size is usually set to the maximum value of 1500 (for Ethernet networks). Next, you need to add an entry to the kernel routing tables that let the kernel know about the local machine's network address. That lets it send data to other machines on the same network. The IP address that is used with the route command to do this is not your local machine's IP address, but that of the network as a whole without the local identifier. To set the entire local area network at once, the -net option of the route command is used. In the case of the IP addresses shown previously, the command would be: route add -net 147.123.20.0 This command adds all the machines on the network identified by the network address 147.123.20 to the kernel's list of accessible machines. If you didn't do it this way, you would have to manually enter the IP address of each machine on the network. An alternative method is to use the /etc/networks file which can contain a list of network names and their IP addresses. If you have an entry in the /etc/networks file for a network called foobar_net, you could add the entire network to the routing table with the command: route add foobar_net Once the route has been added to the kernel routing tables, you can try the Ethernet interface out. This step assumes, of course, that you are connected to other machines and that you know the IP address of one of them. If your network isn't installed yet or you are not connected to another machine that is running TCP/IP, you can't try this step now. To http://24.19.55.56:8080/temp/lsg30.htm (11 of 34) [3/17/2001 7:49:30 PM]
