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Need help with Cisco wireless and DHCP

Posted on 2012-03-22
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Last Modified: 2012-03-27
Hello. We have a Cisco wireless network with 4 APs in the main office, and 1 AP at a satellite location. The two location have different LAN IPs. I want to configure things so that wireless clients in the satellite office are pointed to the satellite office DHCP server. This is what i have done:
- defined two WLANs (Main & Satellite). They both connect to the same Controller Interface (port 1)
- In the Satellite WLAN properties, I went to the Advanced tab and checked to "Override DHCP server" specifying the IP address of the Satellite DHCP.
despite these, my Satellite wireless clients are getting an IP address from the main office DHCP. Need some help in setting this up properly. thanks!
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Question by:criskrit
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Expert Comment

by:Craig Beck
ID: 37759409
The easiest way to do this is to configure the satellite AP in H-REAP mode.  This will enable local switching, instead of sending all traffic via the AP to the controller.

By overriding the DHCP server, you're only telling the controller to forward DHCP requests to a different DHCP server.  That doesn't tell the client to pick up a different IP address though as the GIADDR will be forwarded within the request.

You could also use AP VLAN groups, but this is a little harder to configure.  H-REAP is a better solution as the WLAN will continue to function at the satellite office if the WAN link fails.
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by:criskrit
ID: 37759433
Sounds like a good plan, can you explain how to do the H-REAP thing? Does this mean the AP will stop being controlled by the controller and work autonomously? How do i manage it in this case? deep thanks!
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Craig Beck earned 400 total points
ID: 37759552
The AP will still be controlled by the WLC but it won't send client traffic to the WLC - instead it will deal with client traffic as though it was an autonomous AP.

Here's the Cisco H-REAP configuration guide...

http://www.cisco.com/en/US/docs/wireless/controller/6.0/configuration/guide/c60hreap.html


And here's the configuration example...

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a00807cc3b8.shtml
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Author Comment

by:criskrit
ID: 37768914
hi again, i went through the stuff you sent me and in all honesty got a bit confused. The example suggests i create separate WLANs for each mode of operation (Central or Local Authentication, Central or Local Switching). However I only want one mode: Local Authentication, Local Switching. Also, for now I don't care about user authentication (Radius, Local users etc), clients can simply connect if they have the Pre-Shared Key (PSK). Do i need to setup WLANs for all other modes? Can i "force" Local Authentication/Switching although the AP can "see" the Controller?

This is what i have setup:
- A WLAN using WPA2/PSK authentication, with H-REAP Local Switching Enabled, and with "DHCP Overrride" checked
- An AP operating in H-REAP mode. I haven't specified any VLANs in the H-REAP tab given that there is only one VLAN in the Satellite office.
- An AP Group that associates the WLAN with the AP

does all this sound right? What I am trying to achieve is for the clients to authenticate with the PSK, connect to the AP, and get a LOCAL ip address from the DHCP specified in the "DHCP override" field.

deep thanks!
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Author Comment

by:criskrit
ID: 37772258
actually, no need to answer, the configuration works so this covers me! :-)
i will ask other questions in separate threads, i am closing/awarding this one.
thanks for the help! :-)
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by:criskrit
ID: 37774253
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