Troubleshooting the Routing Table in VB.NET

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Troubleshooting the Routing Table
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If you have configured RRAS correctly, and you are still experiencing routing problems, another cause could be that the routing table does not contain the information needed to route network traffic properly. The cause of this problem depends largely on whether you use static routing or dynamic routing. If you use static routing, someone might have deleted, omitted, or mistyped important routing table entries. If you use dynamic routing, your routing protocol might not be functioning properly.
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Troubleshooting Static Routing
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Because static routing requires human beings to create all the specialized entries in a routing table, the only possible source of problems in the routing table (excluding hardware failures) is human error. If you have created your static routes in the Routing And Remote Access console, you can view and modify them there by selecting the IP Routing s Static Routes subheading in the console tree (see Figure 5-10). Note, however, that doing this displays only the static routes you have created in the Routing And Remote Access console.
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Important If someone has created static routes using the Route.exe command line utility, these routes do not appear in the Routing And Remote Access console s Static Routes dis play, nor do the default entries in the routing table appear. The only way to modify or delete routing table entries created with Route.exe is to use Route.exe.
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Using Routing and Remote Access
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Figure 5-10 The Static Routes display in the Routing And Remote Access console
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To display the entire routing table for the computer using the Routing And Remote Access console, click the Static Routes subheading and, on the Action menu, click Show IP Routing Table, to produce a display like the one in Figure 5-11. You cannot modify the routing table in this display, however, just view it.
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Figure 5-11 The RRAS IP Routing Table window
The Route.exe command line utility enables you to view, add, modify, or delete any entries in the computer s routing table, regardless of how you created them.
Tip Although it might take you a bit of time to get used to its command line syntax, Route.exe is a much better tool for creating static routes than the Routing And Remote Access console. For example, if you try to create a routing table entry with a gateway address that does not exist on one of the router s connected networks, Route.exe refuses to create the entry and displays an error message. The Static Route dialog box in the Routing And Remote Access console allows you to create this incorrect table entry without complaining.
Lesson 4
Troubleshooting TCP/IP Routing
5-47
Troubleshooting Routing Protocols
If you use dynamic routing, the lack of the proper entries in a router s routing table is the result of the routing protocol failing to put them there. Assuming that no network communications problem is preventing the routers from exchanging messages, it is likely that the routing protocol on one or more of the routers is not configured prop erly. To verify the functionality of the routing protocol, use the following procedures: 1. Verify that the routing protocol is installed on all the participating routers. On an RRAS router, you must install the routing protocol manually after you config ure the Routing and Remote Access service. Other operating systems and standalone routers might have their own procedures for installing or enabling the routing protocol. Make sure that all the routers on the network are configured to use the same routing protocol, and that the protocol implementations are compatible. 2. Verify that the routing protocol is configured to use the correct interfaces. After you install RIP or OSPF on an RRAS router, you must specify the interfaces over which you want the protocol to transmit its messages. To do this, you click the rout ing protocol icon in the console tree and, on the Action menu, click New Interface. In the New Interface dialog box, you select the interface in the computer that pro vides access to the network where the other routers are located. If other routers are located on both networks to which the Routing and Remote Access server is con nected, you should perform this procedure twice, to install both interfaces. Once you have ascertained that RRAS has the routing protocol installed and the interfaces selected, you can begin checking elements specific to the individual routing pro tocol, as described in the following sections.
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