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

Question

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.

Answer 1

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:

1. 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?
2. Have you tried run ipconfig /release and ipconfig /renew command from problematic client side?
3. Can problematic client ping the DHCP server successfully?
4. Have you configure DHCP failover relationship? If yes, what's the mode of failover relationship?

Best Regards,
Sunny

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Answer 2

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

Answer 3

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.

Answer 4

@Sunny Qi 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?

Answer 5

Hi @Dilan Nanayakkara ,

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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