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C:\>route print =========================================================================== Interface List 0x1 MS TCP Loopback interface 0x2 00 11 d8 30 16 c0 NVIDIA nForce Networking Controller =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0000 0000 1012141 101214201 1 1012140 2552552550 101214201 101214201 1 101214201 255255255255 127001 127001 1 127000 255000 127001 127001 1 16925400 25525500 101214201 101214201 20 224000 240000 101214201 101214201 1 255255255255 255255255255 101214201 101214201 1 Default Gateway: 1012141 =========================================================================== Persistent Routes: None C:\>
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Unlike the routing table for the typical home router you saw in Figure 8-7, this one seems a bit more complicated, if for no other reason than it has a lot more routes My PC has only a single NIC, though, so it s not quite as complicated as it might seem at first glance Take a look at the details First note that my computer has an IP address of 101214201, /24 subnet, and 1012141 as the default gateway NOTE Every modern operating system gives you tools to view a computer s routing table Most techs use the command line or terminal window interface often called simply terminal because it s fast To see your routing table in Linux or in Macintosh OS X, for example, just type netstat -r at a terminal (The command will work in Windows as well) In Windows, try route print as an alternative You should note two differences in the columns than what you saw in the previous routing table First, the interface has an actual IP address 101214201, plus the loopback of 127001 instead of the word LAN Second and this is part of the magic of routing is something called the metric A metric is just a relative value that defines the cost of using this route The power of TCP/IP is that a packet can take more than one route to get to the same place Figure 8-10 shows a networked router with two routes to the same place The router has a route to network X with a metric of 1 using router X, and a second route to network X using router Y with a metric of 10 NOTE When a router has more than one route to the same network, it s up to the person in charge of that router to assign a different metric for each route
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8: The Wonderful World of Routing
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Figure 8-10 Two routes to the same network
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Route 1 Metric: 1
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Router Route 2 Metric: 10
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Lowest routes always win In this case the router will always use the route with the metric of 1, unless that route suddenly stopped working In that case, the router would automatically switch to the route with the 10 metric (Figure 8-11) This is the cornerstone of how the Internet works! The entire Internet is nothing more than a whole bunch of big, powerful routers connected to lots of other big, powerful routers Connections go up and down all the time and routers (with multiple routes) constantly talk to each other, detecting when a connection goes down and automatically switching to alternate routes
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Figure 8-11 When a route no longer works, the router automatically switches
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Route 1 Metric: 1
Network B
Router Route 2 Metric: 10
I ll go through this routing table one line at a time Remember, every address is compared to every line in the routing table before it goes out, so it s no big deal if the default route is at the beginning or the end This line defines the default route (Any destination address) (with any subnet mask) (forward it to my default gateway) (using my NIC) (Cost of 1 to use this route)
Network Destination 0000 Netmask 0000 Gateway 1012141 Interface 101214201 Metric 1
The next line defines the local connection (Any packet for the 1012140) (/24 network ID) (don t use a gateway) (just ARP on the LAN interface to get the MAC address and send it directly to the recipient) (Cost of 1 to use this route)
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