Wireless router not giving out the proper DHCP lease

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Jul 30th, 2007
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I have recently installed Aironet 1131 AG wireless routers.

I want the router to give out DHCP leases. I have the FA0 on the 110. I have the dot11 on a 120 network. I set up the router to give out leases on the 120 but it keeps giving them on the 110. What am I doing wrong? Thanks.

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Hieu Cao Mon, 07/30/2007 - 12:07
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Do you have the correct ip-helper address in place? Can you post your router config.



scottmac Tue, 07/31/2007 - 08:42
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Even though all of the VLANs are on one device, they are logically separate.

The AP / system will only provide DHCP services on the native VLAN.

To get the addresses to other VLANs, you must also have some kind of Layer 3 device (router / L3 Switch), and an "IP Helper" address set up on the inbound (client side) interface for that VLAN.

So, if you had a router connected and set up for 802.1q trunking, and two logical interfaces fa0/0.110 and fa0/0.120 (110 being the native or management VLAN), you need to go to the fa0/0.120 interface and add "IP HELPER "


Good Luck



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