Solved: DHCP problem Wlan 2125 and ASA 5505

trondkristiansen · ‎01-07-2011

Hello

I have a problem with giving out dhcp to clients in a new wlan setup.

Router/Firewall ASA 5505

Cisco WLC 2125

Switch Catalyst 2960

16 Ap's AIR-LAP1131AG-E-K9

Everything is up and seems fine, but when connecting with clients they does'nt get ip. If I set statci ip its working fine.

I have one subnet 192.168.17.0 thats used for everything on wireles called dmz.

See my setup in the image

First i try to set the ASA 5505 as a dhcp server and have the manager and the ap-manager interfaces on the wlc set to 192.167.17.1 as dhcp. Then the AP's get ip, but not clients. Now i try to use wlc as dhcp, but when I set the dhcp server on the management interface 192.168.17.5 (itself), which the wlan use, I loose contact with the wlc for some reason. (But when I did this I managed to have it to give out one ip, before it failed)

Then I tried to make another dynamic interface on port 1, with a unice ip and set 192.168.17.5 (management int) as dhcp server, but then I get a message says I cant use this port and that the ip conflicts with another interface which it does not as I can see (Tried several ip adresses)

Maby its not ideal at all to use the wlc dhcp server with 16 AP's so the best would be if I could use the ASA 5505. Anyone knows if this is possible or what I'm doing wrong with the wlc dhcp setup.

regards

Trond

Federico Ziliotto · ‎01-07-2011

Hi Trond,

16 APs should still be working fine.

10 APs is a general guideline to stay on the safe side, but even with 16 APs this should technically work.

Regards,

Fede

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View solution in original post

trondkristiansen · ‎01-07-2011

Now I got it working by setting the management interface on the wlc to itself 192.168.17.5, both AP's and clients get ip.

But I read in some cisco documentation that was recomended to use the wlc dhcp server if around 10 ap's som wondered if its then possible with 16+ ap's without trouble.