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DHCP issue - wireless network

Posted on 2013-06-12
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Last Modified: 2013-06-12
I have a strange situation with DHCP.  I have a wireless network with ss id's I have about 6 of them on various vlans.  Certain times, I just can not connect to a specific network even though I was connected before.  it's not the ssid that's correct.  I even tried to connect using a static IP and that didn't work either.  I'm not sure where to even start? We can connect to our Guest Network without a problem that's open.  But whenever I tried to connect via SSID I get limited or no access.  I can send packets but none are received according to the network card and if I give a static IP I can send packet but I don't receive according to the network card.  I'm using a Cisco 5500 controller and Cisco AP's
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Question by:WellingtonIS
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17 Comments
 
LVL 30

Expert Comment

by:ded9
ID: 39240973
Network admin guy can run wireshark to trace the problem.

I dont think problem lies in the client or server end..problem might be on the switch or router.

http://www.wireshark.org/


Ded9
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Author Comment

by:WellingtonIS
ID: 39241009
OK I'll try wireshark
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Author Comment

by:WellingtonIS
ID: 39241066
Wireshark isn't showing anything because the PC can't grab and IP but what's strange is I have another Laptop connected without an issue? As well as other devices. Rebooted the connected machine and now it's not connecting.
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Expert Comment

by:ded9
ID: 39241201
Boot the computer in safe mode with networking a... and then check connectivity...can reboot twice in safe mode with networking.

If it works then problem might be caused by your security software or unwanted software at startup.



Ded9
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Author Comment

by:WellingtonIS
ID: 39241208
From what I can see with wireshark, it's appears to go though all the different subnets requesting a connection.  It gets to the controller on that subnet but it doesn't seem to find the DHCP server.  This is the case when it doesn't connect.  Stranger still, if I give the machine a static IP it still doesn't connect?
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Expert Comment

by:ded9
ID: 39241235
Check this article ...might help

http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a0080af5d13.shtml

After opening the article scroll to

"you can use the DHCP option of the controller interface configuration for the interface you wish to use the internal DHCP server"

check settings.



Ded9
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Author Comment

by:WellingtonIS
ID: 39241290
No we aren't connecting that way.  I have the controller configure to go to the DHCP server.
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LVL 30

Expert Comment

by:ded9
ID: 39241321
Include this question in networking section , network and routers and cisco section by clicking on request attention on the top. Upload the  wireshark log..only the part where u get the error

Lets wait for other suggestions.


Ded9
0
 

Author Comment

by:WellingtonIS
ID: 39241392
Well I reboot my AP closest to me and now I have an IP?  I'm not sure what's up with that nor an I sure if that's my issue.
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LVL 30

Expert Comment

by:ded9
ID: 39241414
Problem might be caused by router or switches..

Include this question in networking section , network and routers and cisco section by clicking on request attention on the top of this question so that  moderate can help you.



Ded9
0
 

Author Comment

by:WellingtonIS
ID: 39241657
Apparently my AP's have a 20 limit connection which may be my issue.  Does anyone know how to increase this limit?
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LVL 30

Expert Comment

by:ded9
ID: 39241683
Can try the step mentioned in this article..till other experts respond

https://learningnetwork.cisco.com/thread/22433


Ded9
0
 

Author Comment

by:WellingtonIS
ID: 39241773
OK - Right now according to my settings my ap's are set for 12 clients and there is a max of 75.  I want to change that to 20-25 is that acceptable?  do I have to reboot my controller?
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LVL 30

Accepted Solution

by:
ded9 earned 2000 total points
ID: 39241814
This is what the article and the cisco doc says

"it is recommended that you optimally connect upto 25 clients if 'N' radio is enabled and upto 20 if 'N' is not enabled. You can certainly connect more that the number mentioned but it will thoroughly affect the bandwidth."


Reboot is not required.



Ded9
0
 

Author Comment

by:WellingtonIS
ID: 39241980
thanks everyone.  I'm going to take care of this.
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Author Closing Comment

by:WellingtonIS
ID: 39241988
Thanks for all this information.  I will make the changes.
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