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Using Static Routing
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Another important element of your routing strategy is your decision to use static or dynamic routing on your network. To forward network traffic to the proper locations, the routers on your network must have the correct entries in their routing tables. With static routing, network administrators must manually create and modify the routing table entries. Dynamic routing uses a specialized routing protocol to update the table
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Static and Dynamic Routing
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entries automatically. Static and dynamic routing both provide the same level of router performance. The drawbacks of static routing are the amount of manual maintenance the process requires and the routers inability to compensate for changes in the network configuration. Dynamic routing enables routers to compensate for a failed router or WAN link, but it can generate a considerable amount of additional network traffic. The decision to use static or dynamic routing depends on your routing strategy for the entire enterprise, not just the routers connecting remote networks. If you are using routers to connect multiple LANs at each site, these routers tables must have entries that direct traffic destined for other networks to the WAN routers in addition to their internal routing entries. The WAN router tables must have entries that enable them to forward traffic to the appropriate remote site.
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Planning When you consider the number of networks, routers, and sites that make up your
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enterprise, you can decide whether the amount of time and effort needed to maintain static routes is worth the savings in network traffic.
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The traditional tool for modifying routing tables on a TCP/IP computer, dating back to the earliest UNIX incarnations, is a command line program called route. Most operating systems include a version of this tool; in Windows Server 2003 (and all other versions of the Microsoft Windows operating system), the program is called Route.exe. Using Route.exe s four subcommands (PRINT, ADD, DELETE, and CHANGE), you can create new routing table entries and modify or delete existing ones. The ROUTE PRINT command displays the contents of the routing table on a com puter running a Windows operating system, as in the following example:
Network Destination 0.0.0.0 127.0.0.0 192.168.87.0 192.168.2.0 192.168.2.2 192.168.2.255 224.0.0.0 255.255.255.255 Netmask 0.0.0.0 255.0.0.0 255.255.255.0 255.255.255.0 255.255.255.255 255.255.255.255 224.0.0.0 255.255.255.255 Gateway 192.168.2.99 127.0.0.1 192.168.2.21 192.168.2.2 127.0.0.1 192.168.2.2 192.168.2.2 192.168.2.2 Interface 192.168.2.2 127.0.0.1 192.168.2.2 192.168.2.2 127.0.0.1 192.168.2.2 192.168.2.2 192.168.2.2 Metric 1 1 2 1 1 1 1 1
For each routing table entry, the Network Destination and Netmask columns identify a destination network (or host). The Gateway column specifies the IP address of the router the computer should use to transmit packets to the destina tion. The Interface column specifies which of its network interfaces the computer should use when transmitting data to the Gateway router. The Metric column
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indicates the relative distance to the destination. For example, the third entry in the sample routing table specifies that to send traffic to any system on the network 192.168.87.0, the computer should transmit the packets to a router with the IP address 192.168.2.21, using its 192.168.2.2 interface. To create a new entry in the routing table, you use the ROUTE ADD command with parameters that specify the values for the various columns. For example, the com mand to add the third entry in the sample routing table might appear as follows:
route ADD 192.168.87.0 MASK 255.255.255.0 192.168.2.21 METRIC 2 IF 1
The address following the ADD parameter is the Network Destination column value. The subnet mask for the destination network address follows the MASK parameter. The IP address following the subnet mask is the Gateway column value. The Metric column value follows the METRIC parameter, and the number following the IF parameter identifies one of the computer s network interfaces. By substituting the DELETE or CHANGE parameter for ADD, you can create com mands that remove entries from the routing table or modify existing entries. When you use the Routing and Remote Access service to configure a computer running Windows Server 2003 as a router, you can view the system s routing table and create new static routes using a graphical interface provided by the Routing And Remote Access snap-in for Microsoft Management Console (MMC), as shown in the following illustration.
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