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Wireless User cannot get IP Address

Gilang.Ramadhan
Level 1
Level 1

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

1 Accepted Solution

Accepted Solutions

saravlak
Spotlight
Spotlight

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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7 Replies 7

balaji.bandi
Hall of Fame
Hall of Fame

this suggests that you need to check the lease time of the client. it may be sutck with DHCP.

 

BB

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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.

if you have enough pool increase the lease time

BB

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JPavonM
VIP
VIP

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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Rich R
VIP
VIP

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.

Leo Laohoo
Hall of Fame
Hall of Fame

Reboot the AP.  

If the reboot works then it is CSCvw30043 as what @JPavonM said.

saravlak
Spotlight
Spotlight

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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