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Vista – no IP from Cisco router

What if your Vista computer can’t get an IP address from a non-Microsoft DHCP server?

At my client’s sites, I’ve run into an issue twice now with a Cisco T-1 line router; Vista refuses to acquire an IP address from the router’s DHCP server.

It turns out to be a modification in the operating system’s DHCP Broadcast flag setting.  It changed from XP to Vista, from being disabled to being required.

The fix is pretty simple, once you find it:

In the registry,

  • Locate and then click the following registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{GUID}

    In this registry path, click the (GUID) subkey that corresponds to the network adapter that is connected to the network.

  • On the Edit menu, point to New, and then click DWORD (32-bit) Value.
  • In the New Value #1 box, type DhcpConnEnableBcastFlagToggle, and then press ENTER.
  • Right-click DhcpConnEnableBcastFlagToggle, and then click Modify.
  • In the Value data box, type 1, and then click OK.
  • http://support.microsoft.com/kb/928233

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