Building a Static Routing Table

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Building a Static Routing Table

The route command has a number of other switches that can be used to manage a route table statically. Up to this point, the print command is the only parameter that has been used. To manage a route table, however, an administrator must be able to add, delete, change, and clear route table entries. Each of these options is available; the following table shows each respective command:

To Add or Modify a Static Route	Function
route add [net id] mask [netmask]	Adds a route
[gateway]
route -p add [net id] mask	Adds a persistent
[netmask][gateway]	route
route delete [net id][gateway]	Deletes a route
route change [net id][gateway]	Modifies a route
route print	Displays route table
route -f	Clears all routes

Notice the entry that utilizes a -p (persistent) before the add parameter. By default, route table entries are kept only in memory. After a machine is rebooted, any entries that were manually added are gone and must be reentered. You can use batch files, startup scripts—or the persistent switch—to reenter static routes. The persistent entry switch writes route entries into the registry so that they survive a reboot of the machine. Naturally, this removes the need to create batch files or scripts, but requires manual deletion of the routes if they should change.

Route table entries are kept only in memory and will not survive a reboot unless the -p switch is used.

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