Err Msg: The Route Addition Failed: 87

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Article ID: 151795 - View products that this article applies to.
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After you run a ROUTE ADD command, the following error message may appear:
The route addition failed: 87
This message alerts you that you have an addressing problem.


The route addition error message appears in at least these two situations:
  • The gateway address you specify is not on the same logical subnet as any of the network adapters in your system. For example, if your computer has the following configuration and you use the route add command, you receive the error message because the gateway is not on the same logical subnet as your computer:
    ip address
    subnet mask
    In this example, is the remote subnet you want to reach, and is the gateway address you want to use.
  • The destination address you enter is a specific host address instead of a subnet address and you specify a netmask.

    For example, using the same configuration as the first example, if you wanted to reach the following specific computer, you might use the route add mask command:
    ip address:
    subnet mask:
    valid local gateway:
    This command would give you the error 87 message. The ROUTE command expects the subnet address instead of the specific destination address.

    To correctly add a host route, do not specify a netmask. By default, Windows will use a netmask of For example:
    route add
    Or use a subnet mask of all 1s (ones), For example:
    route add MASK
    The mask of all 255s (all 1s) means that the destination address of the packet to be routed must exactly match the Network Address for this route to be used.


Article ID: 151795 - Last Review: February 21, 2007 - Revision: 3.2
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Workstation 3.5

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