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Can't ping the default gateway..

I'm trying to get a 2811 router with a NM-AIR-WLC6 Wireless Controller Module to work with an c1200 series access point. The LWAP is connected to a 2690 switch which has a trunk connected to the router. My configuration looks very similar to example 2 on this page: http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a00807112e2.shtml#ex2. The LWAP does get an IP from the DHCP pool on the router. I can also connect to the GUI of the controller from a PC on VLAN 250 (which also is connected to the switch).

These are my configurations:

Router: http://pastebin.com/VX36uSsS

WLC Module: http://pastebin.com/22fRdDLx

Switch: http://pastebin.com/g3mVGVie

The moment I join my Wireless network I get no IP and when I enter a valid static IP, I still can't ping the gateway. I also noticed that the controller could ping the gateway before I configured the interface. After configuring an interface with that gateway, the controller loses the ability to ping to it. I can't seem to figure out why. I've been working all week on getting this controller and LWAP to broadcast a fully working network. I hope somebody can help me; I tried everything.

Edit: Please, I really need some assistance.

3 REPLIES

Can't ping the default gateway..

Hello,

I noticed that on your WLC the management interface and the ap manager interface have vlan tag of 0.

This means that the management interface is on the native vlan.

However, on your router you did not specify the default vlan!

example:

interface wlan-controller1/0.254

encapsulation dot1Q 254

ip address 172.20.254.254 255.255.255.0

To correct this i think you need to either:

- Mention the correct vlan tag under AP manager and management interfaces on the switch. OR

- specify the vlan on the router as a native so that it became same vlan as the management and ap manager interface.

To specify a vlan as a native you need to add the word "native" at the end of dot1q sentence. example:
# encapsulation dot1Q 100 native

HTH

Amjad

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Re: Can't ping the default gateway..

Thank you for your reply. I just now got it to work by adding an IP address to the vlan254 and vlan100 interfaces on the layer 2 switch. The DHCP now assigns IP addresses to the connecting vlan254 clients. Pretty weird since the Wireless LAN Controller example of Cisco (url in start post) doesn't say anything about configuring IP's on the vlan interfaces. I'm still not sure why I would need a native vlan since it also seems to work correctly without. And this also isn't mentioned in the WLC example of Cisco. But I tried your suggestion and everything seems to keep running.

Re: Can't ping the default gateway..

I am glad to hear that it is now working.

Rating useful replies is more useful than saying "Thank you"
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