My vista u w/ sp1 got a strange problem obtaining ip address from dhcp
servers. if i forgot to connect network cable before i power-on or reboot my
vista, and connected it after vista has booted, the system will not be able
to obtain ip adderss. i tried many methods such as "ipconfig
/release-/renew" or using windows itself's diagnostic tools,but none of them
worked. i also tried shutting down my norton firewall, but that also didn't
help. the only way my vista can obtain an ip address is to connect the
network cable before i power-on or reboot it. anyone got ideas about why this
is happening?

Hi Cym104,

are you getting a DHCP IP address from a Router. if so


Cause for the above problem

This issue occurs because of a difference in design between Windows
Vista and Microsoft Windows XP Service Pack 2 (SP2). Specifically, in
Windows XP SP2, the BROADCAST flag in DHCP discovery packets is set to 0
(disabled). In Windows Vista, the BROADCAST flag in DHCP discovery
packets is not disabled. Therefore, some routers and some non-Microsoft
DHCP servers cannot process the DHCP discovery packets.

Solution

To resolve this issue, disable the DHCP BROADCAST flag in Windows
Vista. To do this, follow these steps

Click Start–Run type regedit click ok

If you are prompted for an administrator password or for confirmation,
type your password, or click Continue.

Locate and then click the following registry subkey from left pane

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\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.

Close Registry Editor.


--
john_cena

-Shihan Sylvester Pietersz-
-(MCP,MCSA,MCSE+Security,MCSE+Messeging-
-MCTS,MCITP)-
-Systems -::-Engineer / Consultant Trainer- ::