<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985 1073750139 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin-top:0in; margin-right:0in; margin-bottom:10.0pt; margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} .MsoPapDefault {mso-style-type:export-only; margin-bottom:10.0pt; line-height:115%;} @page Section1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;} div.Section1 {page:Section1;} /* List Definitions */ @list l0 {mso-list-id:1538852620; mso-list-template-ids:1547737332;} ol {margin-bottom:0in;} ul {margin-bottom:0in;} --> Windows 7 RC, PC and Toshiba laptop, both with the same problem. Here is how it started. Internet connection sometimes connected to the router, most of the times not. Message was unidentified network, troubleshooter did not help, didnt find a thing. Even rebooting the machine did not help. First I started shutting down the computer, turn off the Netgear router. Then start router, 30 seconds later started the PC, that worked most of the times. Then yesterday I found this: To resolve this issue, disable the DHCP BROADCAST flag in Windows Vista. To do this, follow these steps: Click Start Collapse this imageExpand this image , type regedit in the Start Search box, and then click regedit in the Programs list. Collapse this imageExpand this image 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: 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 . Close Registry Editor. By setting this registry key to 1, Windows Vista will first try to obtain an IP address by using the BROADCAST flag in DHCP Discover packets. If that fails, it will try to obtain an IP address without using the BROADCAST flag in DHCP Discover packets. This took care of it since yesterday, on the weekend I will try to apply that to my laptop.

How do you find the GUID?

Do something for me... go to Adapter Settings (from Networking and Sharing) and go to the IP v4 and Ip v6... what does it say under IP adress???

Greg, go here: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{0F85E11F-0492-4659-92A9-F3FABD6280BF}the GUID is the thing with the long numbers.

Greg, go here: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\{0F85E11F-0492-4659-92A9-F3FABD6280BF}the GUID is the thing with the long numbers.

My system has four guids

Sweet, my internet connection would always fail on boot-up. I would have to disable the adapter and renable it for it to properly establish a connection. It was trying to make 2 connections (from 1 adapter) so it conflicted. It would sord of connect to the router but never fully get to the internet (I know that sounds messed up but it's what it was showing). Anways, this fixed it for me. Restarted 3 times and it works everytime now. Thanks : )I am using Windows 7 RC, just an FYI

hi,I am in DHCP client team and wanted to understand the issue you are facing. What is the exact OS version you have? And what is the issue you are facing? In Win7 RC, the broadcast bit toggling is enabled by default. As you said that you had to create a registry key for that and then set it to 1 for toggling the broadcast bit, I am little surprised as it should have been toggled without you even creating that registry key on Win 7 RC. In order to confirm if there is no issue around that, can you please provide me the traces by following the instructions below and then sending them to dhcpblog@microsoft.com1) Copy-paste the following exact instructions in a dhcptrace.cmd file@echo off IF "%1" == "-start" (netsh dhcpclient trace disable > NULnetsh trace stop > NULecho.echo Starting dhcp trace..echo.del /Q %TEMP%\DhcpTracesecho.echo Creating the folder %TEMP%\DhcpTracesecho.mkdir %TEMP%\DhcpTracesipconfig /all > %TEMP%\DhcpTraces\IpConfigStart.txtREG QUERY "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v BuildLabEx > %TEMP%\DhcpTraces\BuildLabVersion.txtREG QUERY "HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters" /s > %TEMP%\DhcpTraces\TcpIpParametersStart.txtREG QUERY "HKLM\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters" /s > %TEMP%\DhcpTraces\TcpIp6ParametersStart.txtREG QUERY "HKLM\SYSTEM\CurrentControlSet\Services\Dhcp\Parameters" /s > %TEMP%\DhcpTraces\DhcpParametersStart.txtnetsh trace start scenario=AddressAcquisition ^provider=Microsoft-Windows-TCPIP ^provider=Microsoft-Windows-winsock-AFD ^provider=Microsoft-Windows-WFP ^tracefile=%TEMP%\DhcpTraces\addracq-cap.etl protocol=UDP overwrite=yes report=no capture=yes >> %TEMP%\DhcpTraces\OtherLogs.txtnetsh dhcpclient trace enable >> %TEMP%\DhcpTraces\OtherLogs.txtnetsh dhcpclient trace dump copy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpv4trace.log %TEMP%\DhcpTraces\dhcpv4tracestart.log >> %TEMP%\DhcpTraces\OtherLogs.txtcopy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpv6trace.log %TEMP%\DhcpTraces\dhcpv6tracestart.log >> %TEMP%\DhcpTraces\OtherLogs.txtecho Dhcp tracing successfully startedgoto eof ) IF "%1" == "-stop" (echo.echo Stopping dhcp trace. Please wait for a few seconds..ipconfig /all > %TEMP%\DhcpTraces\IpConfigStop.txtREG QUERY "HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters" /s > %TEMP%\DhcpTraces\TcpIpParametersStop.txtREG QUERY "HKLM\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters" /s > %TEMP%\DhcpTraces\TcpIp6ParametersStop.txtREG QUERY "HKLM\SYSTEM\CurrentControlSet\Services\Dhcp\Parameters" /s > %TEMP%\DhcpTraces\DhcpParametersStop.txtnetsh dhcpclient trace disable >> %TEMP%\DhcpTraces\OtherLogs.txtcopy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpcsvc.etl %TEMP%\DhcpTraces\dhcpcsvc.etl >> %TEMP%\DhcpTraces\OtherLogs.txtcopy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpcsvc6.etl %TEMP%\DhcpTraces\dhcpcsvc6.etl >> %TEMP%\DhcpTraces\OtherLogs.txtcopy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpqec.etl %TEMP%\DhcpTraces\dhcpqec.etl >> %TEMP%\DhcpTraces\OtherLogs.txtnetsh dhcpclient trace dumpcopy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpv4trace.log %TEMP%\DhcpTraces\dhcpv4traceend.log >> %TEMP%\DhcpTraces\OtherLogs.txtcopy /y %SYSTEMDRIVE%\Windows\System32\Logfiles\WMI\dhcpv6trace.log %TEMP%\DhcpTraces\dhcpv6traceend.log >> %TEMP%\DhcpTraces\OtherLogs.txt netsh trace stop >> %TEMP%\DhcpTraces\OtherLogs.txtmove /y %TEMP%\DhcpTraces\addracq-cap.etl %TEMP%\DhcpTraces\addracq-cap-uncorrelated.etl >> %TEMP%\DhcpTraces\OtherLogs.txtnetsh trace correlate %TEMP%\DhcpTraces\addracq-cap-uncorrelated.etl %TEMP%\DhcpTraces\addracq-cap.etl retainpii=yes >> %TEMP%\DhcpTraces\OtherLogs.txtecho.echo Dhcp tracing successfully stopped. echo.echo Trace Location: %TEMP%\DhcpTraces echo.echo Please send this folder to the feature team.goto eof ) echo -start:starts the dhcp traceecho -stop:stops the dhcp traceecho eg::dhcptrace -startecho:dhcptrace -stop :eof2) Now on a machine where you are able to repro this issue, in an elevated prompt, please run "dhcptrace.cmd -start"3) Repro the issue. You should not have seen the connectivity as you said in the blog.4) After repro is over, wait for 2 mins and then run "dhcptrace.cmd -stop"5) The log files are copied in %TEMP%\dhcptraces. 6) Please compress and send us this folder.7) Now try to create the DhcpConnEnableBcastFlagToggle registry key.8) again follow the steps from (2) to (6) and provide us the logs.It will be really helpful if you can provide us the above mentioned logs to figure out the exact issue.Thanks

Hi RANUAGARA, Facing the same problem than others about an unidentified network that appear after the fourth reboot and the missing gateway-internet connection, I decided to look around this DhcpConnEnableBcastFlagToggle setting... My network card is an integrated one, Atheros L1 Gigabit 10/100/1000 Ethernet. I tried reinstalling various drivers versions to solve the problem, it worked for the session and on reboot it doesn't work anymore. I tried to create the registry key which did not solve anything for the current session, nor on reboot. I enabled DhcpConnForceBroadcastFlag...nothing more on reboot. Maybe it can help but the key DHCPGatewayHardware is showing a long long hex value which contains my gateway MAC address plus other numbers that don't match any of the other network hardware I have. Is there something to find in this way? Anyway, I created the batch to send you some logs but this time it works fine. How can I help ? :)

It seems that this problem occurred on many computers using Windows 7 or Windows Vista. I know, I'm tired of it. So... after trying every possible solution, today I installed a PCI Network card, and in no more than 3 seconds the network connected. After a few test reboots, the network works great, I don't even have time to notice "Identifying" message. I know this probably sounds like a not useful investment, but it should be one time only solution.Running Windows 7 RC1 32-bit on AMD Athlon 64 X2 Dual Core 5000+ (2.70 GHz), 4 GB DDRII, onboard GeForce 6150SE nForce 430

hi photodjo,Your issue does not seem related to broadcast bit. Can you please enable the DHCP logging as I mentioned above before reboot and stop it after reboot when you see that there is no internet connectivity. Can you please check if the adpater got proper IP address on reboot.Also, the DHCPGatewayHardware contains gateway IP address along with hardware address. So I think you must be seeing the same thing. In any case if you provide the appropriate that will have all the information.Thanks

hi SavySB,What is the problem you are talking about? Is it no internet connectivity and no address acquired on adapter? In case you see the issue on Win7 Beta or RC builds, please provide the traces as I mentioned above. That will be helpful to us in figuring out the issue.ThanksRanu

Hi ! Reading this from my working connection (EnableBcastFlagToggle=1 & ForceBroadcastFlag=1), I disabled these bits, launched the dhcptrace, reboot, then the issue came back. I sent you the log on the mail adress you provided with the http of this post in subject. I included the logs and a short description. Bref, just to say that enabling both of these bits can let you avoid deactivating/reactivating the card to get it work. HAve a nice day !

Well i dont know what the problem was specifically but this is more for microsoft i used this to resolve my issue and since have had none whatsoever for me it was a little different: internet would always work on start up but as soon as i loaded google chrome it would cause the internet connection to crash the computer would idle while trying to fix the connection (wireless card reset sometimes helped, but not consistent), though the time spent down was never consistent it was generally back online within 2 minutes set-up core i7 920 Asus p6t OCZ gold 3gb @ 1600 Radeon 4650 Arkview Wireless N PCI adapter

Click start, type secpol.msc, go to Network List Manager Policies, and change either your network, or what Windows does with unidentified networks. Not sure if this will correct your internet, but it can at least identify your networks easier.