Changes that may help to increase the compatibility of Vista with older networking devices:
Disable the IP Helper service:
1. Hold the Windows key and type R, enter "services.msc" (without the quotes) and press Enter
2. Scroll down to the IP Helper service, right click on it and select Properties
3. In the dropdown box that says "Automatic" or "Manual", set it to Disabled and then click on "Apply"
4. Then click on "Stop" to stop the service from running in the current session
5. Click OK to exit the dialog
1. Hold the Windows key and type R, enter "ncpa.cpl
" (without the quotes) and press Enter
2. Right click on each network connection and select "Properties"
3. Remove the checkmark from the box next to "Internet Protocol Version 6 (TCP/IPv6)
4. Click OK to exit the dialog
NOTE: You should do this for each network connection.
Disable the DHCP Broadcast Flag:
NOTE: You should do this for each and every GUID subkey.
- Hold the Windows key and type R, enter regedit and press Enter.
- Locate and then click the following registry subkey:
- In this registry path, click the (GUID) subkey to be updated.
- If the key DhcpConnForceBroadcastFlag does not exist, use the Edit menu, point to New, and then click DWORD (32-bit) Value. In the New Value #1 box, type DhcpConnForceBroadcastFlag, and then press ENTER. If the key exists, skip this step.
- Right-click DhcpConnForceBroadcastFlag, and then click Modify.
- In the Value data box, type 0, and then click OK.
- Close Registry Editor.
NOTE2: (GUID) is a mnemonic for the individual subkeys, the actual text "GUID" does not appaer.
The only program I'm aware of that currently relies on IPv6 is the new Windows Meeting Space. The first 2 changes will cause that program not to work - but will leave all of your normal (IPv4) connections unaffected. If it causes problems that you can't overcome, simply revert back to the original settings.