Wireless Clients dhcp request

Configuring Wireless Cisco Networks and Wireless Controllers.
Guest

Wireless Clients dhcp request

Post by Guest » Fri Nov 19, 2010 3:03 am

Hi I have 2 sperate DHCP servers installed at my office.One is hosted in a cluster enviornment and the other is on a single seperate windows server.Both my LAN and wireless clients are getting DHCP IP from the single serverBut only my LAN clients are getting IP from the cluter server scoped DHCP, wireless clients are not able to get IP. I have added the following commands on Commands added under vlan 1 interface on gateway routerip helper-address XX.XX.XX.XX windows cluster virtual server IPip helper-address XX.XX.XX.XX (windows stand-alone server IP) Command added globaly on the gateway routerip dhcp smart-relay Can anyone let me know what could be the issue? Many thanks in advance

Guest

Re:Wireless Clients dhcp request

Post by Guest » Fri Nov 19, 2010 4:29 am

You should maybe precise what wireless equipment you have ? Controller ? IOS ? Router with wireless interface ?

Guest

Re:Wireless Clients dhcp request

Post by Guest » Fri Nov 19, 2010 5:47 am

I have a cisco WLC 2125 controller, Model No AIR-WLC2125-K9, ver 6.0.199, with an uplink to my gateway 4507 CAT switch connected to a 2851 router having 1 serial interface and 3 gigabit interface. I have an additinoal subnet configured as the secindary ip on interface vlan 1 on the 4507 CAT switch.This subnet acts as one of the DHCP ranges for which smart-relay has been enabled on the 4507 switch. Now my primary subnet on the vlan 1, 10.101.0.0/22, of which 10.101.3.0/22 is configured as the seciond dhcp range. I hope i have made my scenario clear. Please do let me know if you have any clarifications. many thanks 

Guest

Re:Wireless Clients dhcp request

Post by Guest » Fri Nov 19, 2010 6:32 am

If you have a WLC then ip helper is not needed. You should enter your DHCP servers ip addresses in the interface configuration of the WLC (the interface used for the WLAN).The WLC will be the one doing dhcp proxy. Except if you disabled the dhcp proxy behavior of the WLC in which case, the ip helper on the gateway of the client will be required. Hope it clarifies

Guest

Re:Wireless Clients dhcp request

Post by Guest » Fri Nov 19, 2010 7:31 am

Well the thing is that the uplink from my WLC to the 4507 is configured as a trunk port for carrying both the corporate and guest SSID which are on different subnets. I checked the WLC config and it is as attached  Now if i enable the DHCP server, which subenet do i add there or can i add multiple dhcp serversthe secondary subnet 10.101.10.0/24 is working for both LAN & wireless clients but for some reasom the subnet 10.101.3.0/22 is working only for LAN clients. Thanks Nicolas

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