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ITsVISTA KB-Link: KB2469100

The default gateway is deleted unexpectedly when you delete an additional IP address in Windows Vista or in Windows Server 2008

You delete an additional IP address from a network interface on a computer that is running Windows Vista or Windows Server 2008.

In this case, the default gateway is deleted unexpectedly.

Note: This issue occurs if you add the default gateway by using the route add -p command.

The following is an example scenario:

  1. You configure only the IPv4 address and subnet mask on a network interface:

    Ethernet adapter Local Area Connection 1:
    IPv4 Address. . . . . . . . . . . :
    Subnet Mask . . . . . . . . . . . :
    Default Gateway . . . . . . . . . :

  2. You add a default gateway route entry with a persistent option by using the route command:

    route add -p mask

  3. You add an additional IP address to the network interface by using the netsh command:

    netsh interface ipv4 add address “Local Area Connection 1″

  4. You delete the additional IP address from the network interface by using the netsh command:

    netsh interface ipv4 delete address “Local Area Connection 1″

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2469100.

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