All Laptope are assigning a 169.x.x.x range.

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dilannanayakkara-8008 asked Dec 1, '20 SunnyQi-MSFT commented Dec 4, '20

All Laptope are assigning a 169.x.x.x range.

Hi All,

Devices are able to connect to the WiFi network but unable to reach the internet. When viewing assigned IP on a device with no internet connection :
IPv4 - 169.254.234.37
Subnet - 255.255.0.0
(No Gateway)

However, I have checked the device that can go to the Internet, and below are the details.

With internet -
IPv4 - 10.200.19.217
Subnet - 255.255.248.0
Gateway - 10.200.16.1

I have checked the DHCP SCOPE settings and Please refer the below screenshots:

However other scopes in DHCP seem working fine so far.

appreciate the help here to troubleshoot the issue.

windows-server windows-dhcp-dns

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Answer 1 · 2020-12-02T04:43:37.01Z

SunnyQi-MSFT answered Dec 2, '20 dilannanayakkara-8008 commented Dec 2, '20

Hi,

Thanks for posting in Q&A platform.

Based on your description, my understanding is all laptops cannot obtain IP address from DHCP server. And the problematic scope was only 10.200.16.1-10.200.23.254. Please correct if my understanding was wrong.

IP address start with 169.254.xxx.xxx means the client cannot contact DHCP server or cannot get response from DHCP server, and then it will checks the setting on the Alternate Configuration tab of the properties of the TCP/IP protocol. If Automatic private IP address is selected, the DHCP client auto-configures its IP address and subnet mask by using a selected address from the Microsoft-reserved Class B network, 169.254.0.0, with the subnet mask 255.255.0.0.

Before we go further, I would like to confirm the following information with you:

Based on your description, my understanding is all laptops cannot obtain IP address from DHCP server. How about desktop machine, can desktop obtain IP from DHCP server?
Have you tried run ipconfig /release and ipconfig /renew command from problematic client side?
Can problematic client ping the DHCP server successfully?
Have you configure DHCP failover relationship? If yes, what's the mode of failover relationship?

Best Regards,
Sunny

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dilannanayakkara-8008 · Dec 02, 2020 at 04:10 PM

@SunnyQi-MSFT Can you please refer to the below details.

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Answer 2 · 2020-12-02T16:09:26.28Z

dilannanayakkara-8008 answered Dec 2, '20

Hi Sunny,

Thank you very much for answering. Yes, You are correct, all laptops cannot obtain IP address from DHCP server. And the problematic scope was only 10.200.16.1-10.200.23.254. Please find below answers to your questions.

1) Yes, Yes, If I plug into ethernet, we can get an IP address from DHCP. not only desktop, even though laptops are capable of getting IP addresses from different ethernet scope. the DHCP scope address is something like 10.10.162.x and that means a different scope.

2) No not yet, I will try. as well as I will try disabling IPV6.
3) frankly, I didn't try that. I will try that share the result with you.
4) No failover relationship.

further, I have checked the impacted scope statistics, and according to that there are 149 addresses are in use for the moment.again I have noticed there are pcs having future expiration dates of IPs and the lease for that scope is 1 day. is that mean that scope is releasing ip addresses to some of the pcs without an issue?

one more thing, with all of these details, can we conclude DHCP server is functioning and looking at the issue from the client-side or network side?

Thanks,
Dilan

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Answer 3 · 2020-12-02T18:05:58.073Z

yagmoth555 answered Dec 2, '20 dilannanayakkara-8008 commented Dec 3, '20

Hi

Please check your access-point or router that provide the WiFi and come back to me with the model too as I could help if it's a brand I know.

I told it as an IP in the range 169.254.. mean the laptop can't talk to the DHCP server. The WiFi is created corrected as you an connect to it, but the bridge to the LAN seem not OK there.

A DHCP request is a broadcast packet, your router might block that, or you might have a bad IP helper policy set that block your WiFi to work.

Thanks, and let me know what gear provide the WiFi.

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dilannanayakkara-8008 · Dec 03, 2020 at 02:19 AM

@yagmoth555 Thank you

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Answer 4 · 2020-12-03T02:23:21.91Z

dilannanayakkara-8008 answered Dec 3, '20 dilannanayakkara-8008 commented Dec 3, '20

@SunnyQi-MSFT I have done the below change and it has been working now

Disabled IPV6 on the wireless adapter
Disabled the firewall on the client
ipconfig /release and renew

but the problem is we have around 300 + devices.

Appreciate if anyone can let me know if this could be a network issue or client itself?

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SunnyQi-MSFT · Dec 03, 2020 at 02:54 AM

Hi,

Thanks for your feedback.

is that mean that scope is releasing ip addresses to some of the pcs without an issue?

Yes, the DHCP server can release IP address as expected.

Furthermore, could you please try to enable Windows firewall and then run ipconfig /release and ipconfig /renew from the client side to see if the Windows Firewall block the traffic from client to DHCP server?

Best Regards,
Sunny

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dilannanayakkara-8008 SunnyQi-MSFT · Dec 03, 2020 at 04:06 AM

@SunnyQi-MSFT Thank you very much. one more thing to add, we have azure connected devices and I have disabled the public access firewall.

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Answer 5 · 2020-12-03T05:22:18.927Z

SunnyQi-MSFT answered Dec 3, '20 SunnyQi-MSFT edited Dec 3, '20

Hi @dilannanayakkara-8008 ,

I just came up another idea is that you could also check if there is any 3rd party anti-virus software or any intermediate equipment between client and DHCP server which may block the traffics.

Moreover, I noticed that there is a blue exclamation mark on IPv4 console which means no addresses are available from server scopes because the maximum (100 percent) of the addresses allocated for use are currently leased. This represents a failure of the DHCP server on the network because it is not able to lease or service clients.

For more details, please refer to this article: DHCP Console Icons Reference

Best Regards,
Sunny

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dilannanayakkara-8008 · Dec 03, 2020 at 06:15 AM

HI @SunnyQi-MSFT

When I check scope statistics 7% only in use,. Since I have no idea with this blue exclamation mark on IPv4 console can you please guide me on how to troubleshoot this further?

again, I noticed one of scope is not activated, and I thought that is the cause of the blue icon.

again, I have checked the statistics of IPV4 and says 4% in use. further when I minimized the IPV4 and refresh it is showing as Green.

Appreciate your thoughts here.

Thanks,
Dilan

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SunnyQi-MSFT dilannanayakkara-8008 · Dec 03, 2020 at 06:39 AM

You're correct. Since the status of one of scopes is deactivate, so there was a blue exclamation mark on IPv4 console, I have test it in my lab. You can just ignore it.

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Answer 6 · 2020-12-03T06:55:03.133Z

SunnyQi-MSFT answered Dec 3, '20

Hi,

Thank you so much for your feedback. As you said, you have found the workaround for this issue.

If you want to verify which option caused this issue, I would suggest you try these options one by one.

e.g.

You can try disable IPv6 of the wireless adapter and enable the firewall from client side. Then run ipconfig /release and renew command from client side.

Or you can try enable IPv6 of the wireless adapter and disable the firewall from the client side. And then run ipconfig /release and renew command from client side.

Please understand, from Q&A platform support level, it is hard for us to analyze the cause for this issue. We can only provide some general suggestions here. If you want to find the root cause, I suggest you contact Premier support team.

For more information about our Premier support, please see:

https://www.microsoft.com/en-us/microsoftservices/support.aspx

Best Regards,
Sunny

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Answer 7 · 2020-12-03T08:18:54.05Z

dilannanayakkara-8008 answered Dec 3, '20 SunnyQi-MSFT commented Dec 3, '20

@SunnyQi-MSFT Thank you for all the support.

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SunnyQi-MSFT · Dec 03, 2020 at 08:22 AM

You're welcome @dilannanayakkara-8008 . It's my pleasure to troubleshoot with you. If my answer was helpful to you, please help to accept the answer.

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Answer 8 · 2020-12-04T00:20:38.447Z

dilannanayakkara-8008 answered Dec 4, '20 SunnyQi-MSFT commented Dec 4, '20

@SunnyQi-MSFT thanks for the support. Our issue has been resolved now. The issue was a rogue Meraki firewall. we have removed the firewall and checked, it has been worked without an issue. so firewall guys have done required fix.

Thanks,

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SunnyQi-MSFT · Dec 04, 2020 at 01:50 AM

Glad to hear that your issue has been resolved. If there is anything else we can do for you, please feel free to post in the Q&A platform.

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