Microsoft KB Archive/99686

= Enabling IP Routing =

Article ID: 99686

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1

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This article was previously published under Q99686



SUMMARY
This article describes how to enable IP routing in Windows NT and how to configure static routing tables using ROUTE.EXE.

How to Enable IP Routing
Routing between subnets is disabled by default for the TCP/IP protocol in Windows NT. To enable routing, following these steps:

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

  Start Registry Editor (REGEDT32.EXE) and go to the following subkey:      HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip \Parameters  From the Edit menu, choose Add Value. Enter the following values:

Value Name: IpEnableRouter

Data Type: REG_DWORD

Value: 1

 Exit Registry Editor and restart Windows NT.

Configuring Static Routing Tables
If two subnets are separated by more than one Windows NT machine or by a router, Windows NT can route between the subnets if you manually configure the routing tables. Static configurable routing is supported, but neither routing information protocol (RIP) or OSPF are supported.

The ROUTE.EXE command manually configures network routing tables. ROUTE has the following syntax:

route [-fs] [command [destination][gateway]]

Switches
  -f Clears routing tables

-s Packets for which no destinations are found are routed to the smart gateway.

Commands
  add      Adds a route delete  Deletes a path print   Prints a route change  Changes an existing route All symbolic names used for gateway and destination are looked up in the database files NETWORKS and HOSTS.

Additional query words: prodnt tcp/ip

Keywords: kbnetwork KB99686

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