topic Re: Client made a request to the DHCP server, but it did not respond in Wireless

Client made a request to the DHCP server, but it did not respond

MartynB1 — Fri, 13 May 2022 10:53:08 GMT

Hi,

I've researched this issue and so far haven't found a similar case, so I've signed up to ask for some advice

I have an MR36 running 27.7.1 connected to an MS250-48LP running in test as a PoC for a network wide roll out

I have a Guest SSID distibuting it's own DHCP, and a Production SSID configured to use the local LAN DHCP server.

In the production SSID, I'm getting the DHCP error in the subject, however, clients are getting a valid IP address from the server, with the correct gateway etc, and a lease visible in the DHCP lease list on the Windows server. However the client claims there is no internet access

The MS250 is currently configured to block rogue DHCP servers but specifically allow the DHCP server in question, it's worth noting that client devices connected to the switch via copper are getting addresses and connecting out without issue, there is no L3 configured on this network

Any suggestions of where to look would be a great help, thanks in advance

Re: Client made a request to the DHCP server, but it did not respond

BBETTE — Fri, 13 May 2022 19:50:10 GMT

If you run a packet capture on the wired interface of the AP on which the client is connected, do you see the full DORA exchange as a client tries to associate with the network?

It's been a while since my windows days, I assume it should only populate the lease table after the Ack back from the endpoint?

On the client itself, do you see the entire IP assignment configured as expected, IP, mask, gateway, VLAN?

Does the communication only not work if going towards the internet?

Are you able to ping the gateway?
Could you have some L3 block, possibly a missing return route upstream of the MS?

Are the wired clients on the same VLAN as the wireless clients?

Re: Client made a request to the DHCP server, but it did not respond

Philip D'Ath — Mon, 16 May 2022 19:08:50 GMT

I would start up upgrading to the stable firmware version. You might be fighting issues that no longer exist.

You are a major version out of date.

Re: Client made a request to the DHCP server, but it did not respond

BlakeRichardson — Mon, 16 May 2022 20:00:21 GMT

Is your client device set to pick DNS using DHCP as well or is it manually assigned? If you try manually setting DNS severs does the error go away?

Re: Client made a request to the DHCP server, but it did not respond

MartynB1 — Wed, 18 May 2022 10:50:17 GMT

Thanks for the suggestions guys, I'm out of office this week until Friday, so will pick up with your ideas and report back then

Re: Client made a request to the DHCP server, but it did not respond

davidabuckner — Wed, 18 May 2022 15:45:26 GMT

Have you checked the L3 rule under Wireless ->> Firewall and Traffic shaping? I have seen that rule block traffic going to the servers on the LAN. Change that deny to allow and see if that fixes it.

Re: Client made a request to the DHCP server, but it did not respond

MartynB1 — Mon, 23 May 2022 14:21:03 GMT

Hi Guys, I've managed to put some time aside for this, and to answer some of the questions above, there is no Layer 3 happening on this network currently everything is on default VLAN 1, the Local LAN rule is set to allow, the client gets a valid address but can't ping the gateway, let alone the internet, and there are numerous other AP's with the same config on the same firmware functioning in other businesses under the same corporate ownership. The following packet capture shows the DHCP exchange from the server at x.x.x.2:

--- Start Of Stream ---
reading from file /tmp/click_pcap_dump, link-type EN10MB (Ethernet), snapshot length 9600
14:06:47.108066 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:06:48.607392 ARP, Request who-has x.x.x.87 tell x.x.x.2, length 46
14:06:50.094866 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 313
14:06:50.121799 ARP, Request who-has x.x.x.2 tell x.x.x.222, length 46
14:06:50.122399 ARP, Reply x.x.x.2 is-at xx:xx:xx:xx:xx:xx, length 46
14:06:50.923239 ARP, Request who-has x.x.x.196 tell x.x.x.2, length 46
14:06:58.177514 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:06:58.180722 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:06:58.181458 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:07:01.092245 ARP, Request who-has x.x.x.218 tell x.x.x.2, length 46
14:07:02.023750 ARP, Request who-has x.x.x.205 tell x.x.x.2, length 46
14:07:02.625115 ARP, Request who-has x.x.x.2 tell x.x.x.187, length 46
14:07:02.641458 ARP, Request who-has x.x.x.208 tell x.x.x.2, length 46
14:07:02.643704 ARP, Request who-has x.x.x.187 tell x.x.x.2, length 46
14:07:02.908839 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:07:06.860131 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 313
14:07:06.886681 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:07:08.944501 IP x.x.x.2.67 > 255.255.255.255.68: BOOTP/DHCP, Reply, length 307
14:07:09.637136 ARP, Request who-has x.x.x.98 tell x.x.x.2, length 46
14:07:12.352409 ARP, Request who-has x.x.x.125 tell x.x.x.2, length 46
14:07:12.364550 ARP, Request who-has x.x.x.128 tell x.x.x.2, length 46
14:07:15.237527 ARP, Request who-has x.x.x.2 (xx:xx:xx:xx:xx:xx) tell x.x.x.222, length 46
14:07:15.238167 ARP, Reply x.x.x.2 is-at xx:xx:xx:xx:xx:xx, length 46
--- End Of Stream ---

Any thoughts!? Thanks in advance....

Re: Client made a request to the DHCP server, but it did not respond

MarkB — Mon, 13 Jun 2022 12:28:36 GMT

Hi Martyn,

Did you manage to fix this? We have a similar issue...

Thanks

Mark

Re: Client made a request to the DHCP server, but it did not respond

MartynB1 — Mon, 13 Jun 2022 12:55:29 GMT

Sadly not, no! Still hoping someone discovers this and knows the solution! Comforting to know I'm not alone however!

Re: Client made a request to the DHCP server, but it did not respond

Abdulaziz Loonat — Wed, 15 Jun 2022 08:18:46 GMT

I have a similair issue where a MS-410 acting as a DHCP server does not fullfill a DHCP request, running Wireshark on both client and switch I can see the DHCP Discover but never the Offer coming thru from the switch

I have been spoken to Meraki support and they recommend by rebooting the switch and see if this resolves the issue. Not ideal as I would much prefer to get a root cause of this issue.

Re: Client made a request to the DHCP server, but it did not respond

MarkB — Wed, 15 Jun 2022 08:21:00 GMT

I'm not convinced that this is a DHCP server issue, as we are seeing this on Corporate and Guest SSIDs both of which use different DHCP servers - Corporate a Windows server and Guest DHCP is running on a Firewall.

Re: Client made a request to the DHCP server, but it did not respond

MartynB1 — Wed, 15 Jun 2022 09:07:58 GMT

In for a penny...... I just rebooted my switch, as it isn't technically in a production environment yet, so almost no impact on anyone beyond myself...... Rebooting the switch obviously caused a reboot of the AP and I'm still seeing the same issue on the SSID distributing DHCP from the Domain Server, the Laptop does have a valid address, I've released it, reserved it and then renewed to force the server to issue a new address, but nada, can't ping the gateway or anything else. The other SSID works fine using the AP's own DHCP service, devices can browse out through that without issue

Re: Client made a request to the DHCP server, but it did not respond

MarkB — Wed, 15 Jun 2022 11:53:06 GMT

Anyone using this...?

Cisco Meraki Wireless Health API Integration - Splash Access Cisco Meraki

Re: Client made a request to the DHCP server, but it did not respond

MartynB1 — Wed, 15 Jun 2022 12:20:50 GMT

I have access to a "Health" page, under Wireless>Monitor that offers a lot of information regarding indivdual client experience, is this something different?

Re: Client made a request to the DHCP server, but it did not respond

MarkB — Wed, 15 Jun 2022 12:22:34 GMT

Yes splash portal is an add-on.

Thanks

Mark

Re: Client made a request to the DHCP server, but it did not respond

Phil Nape — Fri, 17 Jun 2022 15:10:56 GMT

Hi,

If the wireless config was the issue then you would see it on dashbaord when looking at the client page. Assuming that your setup is correct, and considering that the SSID works elsewhere in the business, I would look at the DHCP/ Radius Servers, do we have the users from the affected site in the correct groups and also where they authenticate, what happens after they authenticate ?, ipconfig /all from affected user and can we ping the DNS from affected user and or switch

Also test by setting up the SSID not to use any authentication and have a user connect and test ( Access Control>Network Access>open no encryption )

But before everything, please make sure you firmware is up to date on both MR's and MS's

Hope this read will not be a waste of time lol

Regards

Phil

Re: Client made a request to the DHCP server, but it did not respond

Shamwedge — Wed, 22 Jun 2022 19:00:12 GMT

I'm getting this same error for multiple clients.

This appears to only be happening on SSID's where client IP assignment is configured to Local LAN. I'm wondering if this is simply a software bug caused by having bridge mode enabled.

Outside of the error message, cleints do connect without issues.

Re: Client made a request to the DHCP server, but it did not respond

MarkB — Wed, 22 Jun 2022 19:08:24 GMT

We have just changed from L3 roaming to L2 Bridge mode and we are seeing this in both modes. We did have 2 DHCP servers configured, we have recently removed the second one and the errors have reduced but not gone away completely.

Re: Client made a request to the DHCP server, but it did not respond

BBETTE — Wed, 22 Jun 2022 21:39:06 GMT

Ughhhhh.. meant after the ACK is sent by the server, not the client.

Re: Client made a request to the DHCP server, but it did not respond

MartynB1 — Wed, 29 Jun 2022 10:18:55 GMT

Hi Guys, I've been away from the office a lot recently, however I set the AP's to update to the latest firmware on Monday and have just got back in to the office for testing today.....

Switches and AP's all now running the latest firmware, when I said the same setup was running in the other businesses we support, I was referring to the firmware version at the time, and the SSID configuration, the SSID I'm having an issue with isn't functioning elsewhere in the organisation, it is however identically configured to others that are functioning as they should

There is no Layer 3 config on this network, nor is there any Radius, the SSID is set up to use a PSK in Bridge Mode with a single Windows 2008R2 DC serving DHCP. I have tried your suggestion and mirrored this setup in a test SSID with open access (no PSK) and have the same issue;

Client made a request to the DHCP server, but it did not respond.request_ip='x.x.x.219' request_server='x.x.x.2' details='no_dhcp_response' radio='1' vap='2' channel='108' rssi='50'

However, the client has a valid IP address, DNS server entries and gateway ip as well as the correct DNS Suffix, yet can't ping any of the above

How do I go about raising a ticket with support?