05-20-2021 07:42 PM - edited 07-05-2021 01:19 PM
Hi,
I have issue with the wireless users are not getting IP address from the IOS DHCP server.
But, after ipconfig /renew the wireless users get IP address. LAN user can get IP Address without problem.
the setup of the network is straight forward
WLC-->CORE-->DIST-->AP-->User
the DHCP scope has been created on the core.
I am using WLC 5520 8.10.142.0
Thanks,
Gilang
Solved! Go to Solution.
05-24-2021 12:24 PM
Enable dhcp-required on WLAN's advanced config -This should force the client to do dhcp whenever it connects/roams, there could be slight delay and not noticed in data network. Don't apply this change on WLAN using voice/video services.
05-20-2021 07:53 PM
this suggests that you need to check the lease time of the client. it may be sutck with DHCP.
05-20-2021 08:40 PM
this is the dhcp pool configuration in Core for wireless,
ip dhcp pool 38
network 10.42.38.0 255.255.254.0
default-router 10.42.39.254
dns-server 10.41.21.21 10.41.21.20 10.42.21.20
domain-name mapin.local
I have tried configure the lease time 1 day, but the results are still the same,
when wireless user connect to SSID after the lease time is over, the problem appears.
05-21-2021 01:56 AM
if you have enough pool increase the lease time
05-21-2021 04:40 AM
You are maybe hitting CSCvw30043.
The solution is to upgrade to latest suggested version (8.10.151.0)
As this is due to APs not forwarding DHCP offers, if you need a temporary workaround before scheduling the migration then increase the DHCP lease to 10 days so the client do not start asking to validate lease after 50% of the lease time has gone, and also to disable session timeout for the WLAN or configure it for 15-20 hours to prevent re-authentication on business hours.
HTH
-Jesus
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05-21-2021 06:29 AM - edited 05-21-2021 06:30 AM
Probably not your problem but the only time I've had Windows users not able to renew IP addresses was when IT accidentally deployed a Windows firewall policy update which blocked unicast DHCP packets causing Windows to fail DHCP renew.
05-24-2021 01:01 AM
Reboot the AP.
If the reboot works then it is CSCvw30043 as what @JPavonM said.
05-24-2021 12:24 PM
Enable dhcp-required on WLAN's advanced config -This should force the client to do dhcp whenever it connects/roams, there could be slight delay and not noticed in data network. Don't apply this change on WLAN using voice/video services.
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