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Community Member

Access point not working

Last week, I install a new switch at one of our branches. Since then, when you connect to the public wireless network you get limited or no connectivity. I was working with the old switch.. Any help is greatly appreciated.

Thanks,

DJ

18 REPLIES
Community Member

Re: Access point not working

Are you referring to the windows error "limited or no connectivity?" If so, that means you aren't receiving an IP address from your DHCP server. If the switch you replaced was a Layer 3 switch, you will need to make sure you have the 'ip helper-address x.x.x.x,' configured where x.x.x.x is the IP address of your DHCP server.

Example:

interface vlan1 (the vlan the AP is in)

ip address 1.1.1.1 255.255.255.0

ip helper-address 10.1.1.1

HTH,

Jason

Community Member

Re: Access point not working

It's already there. The only difference in the orginal (and then it was working) is the ip helper-addresses were the old servers and they are not longer on the network.

And the wireless network I'm troubleshooting, is for the public, therefore it doesn't have wpa keys. I'm new to wireless, so maybe I missing something. I will be at the branch having the trouble sometimes next week. Any advice you can give me on troubleshooting the switch and accesspoint connection would be greatlly appreciated. If I can supply any additional info, just ask.

Thanks,

DJ

Community Member

Re: Access point not working

Based on your description, it sounds like the problem is the client is not receiving an IP address. I would make sure the 'ip-helpers' are correct, a valid "Public" DHCP scope is created on the DHCP server, and verify the "Public" VLAN is tagged between the switches in the infrastructure.

Regards,

Jason

Community Member

Re: Access point not working

I'm not sure have you mean by tagged. Your right, it's not getting an iP address. The Ip helpers are correct. DHCP scope is in place. It's making me crazy. It's got to be something simple.

Regards,

DJ

Community Member

Re: Access point not working

Is the AP plugged directly into the switch with the 'ip helpers'?

The 'ip helpers' should be associated with an 'interface vlan xx.' Make sure the port the AP is plugged into is apart of that vlan. If the AP is serving multiple users (guests and employees, i.e. multiple vlans), then multiple vlans will need to be tagged on the link between the AP and switch and between any other switches that in the path down to the switch with the 'ip helpers' on it. The vlan tagging can be accomplished using dot1q trunking.

What kind of AP are you using? Autonmous or Lightweight?

Can you post the configuration of the switch with the 'helpers' and the switch the AP is plugged into?

Community Member

Re: Access point not working

Thanks. The access point is connected on port 24. Please let me know if you have anymore questions.

Thanks,

DJ

Community Member

Re: Access point not working

It looks like port 24 is in desirable mode which will only negotiate a trunk if the other end is running DTP as well. I'm not sure on the AP running DTP. So please manually set port 24 to act as a trunk with these commands.

Try these on port 24:

switchport trunk encapsulation dot1q

switchport mode trunk

switchport trunk native vlan 1

Please rate if this helps.

thx..keep me posted.

Community Member

Re: Access point not working

Donna,

I notice that all your vlan's are in the "shutdown" state, none of them will work while they are like that. You'll need to access the interface on the switch and perform a "no shut" to activate the interface.

If you need further assistance on this, let me know.

Craig

Community Member

Re: Access point not working

No luck! I've tryed everything suggested and still get limited or no connectivity. Everything else works fine. Just Can't get and IP address on the wireless. We've had problems before with the wireless, but never with the public wireless. It's wide open, no keys or passwords. Any suggestions?

Community Member

Re: Access point not working

Hi Donna,

What model of switch and which IOS is it running?

Thanks,

Craig

Community Member

Re: Access point not working

Hi Donna,

Another question for you.

When you say everything else works fine, do you mean that the abbessidprivate and the abbessidpublic are working fine? Let me know.

Thanks,

Craig

Community Member

Re: Access point not working

It's a 3550 with version 12.2.

No, I'm not sure if any of the wireless is working. We only use the ABBEnet at that location. I'm going to make a trip out to that location sometimes this week. By everything else, I meant the switch. Not the access point. I just replaced the switch and it was working fine before and ABBEnet was working fine with the old switch.

Any advice would be great. Even advice on trouble shotting it once on location. We don't usually have trouble with ABBEnet. It's wide open, no keys or passwords. We have trouble with some of the keys on the other two wireless networks.

Before I came here they where having trouble with them because of the keys. We have cisco and bluesocket accesspoints and they can't use the same keys. Well, bluesocket doesn't support the longer keys. THis is my next project. And I really haven't worked with wireless before. Should be fun.

Let me know if you have any more questions.

Thanks,

DJ

Community Member

Re: Access point not working

what model of access point is connected to port 24 on the switch?

thanks,

Community Member

Re: Access point not working

can you ping the new dhcp servers from the new 3550 switch?

Craig

Community Member

Re: Access point not working

Yes and from the access point.

Community Member

Re: Access point not working

Can you post the config of the old switch?

Community Member

Re: Access point not working

It's attached.

Thanks,

DJ

Re: Access point not working

It happens when IP is not received from dhcp, check the scope of dhcp.

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