Wireless Access

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Contributor I
Posts: 34
Registered: ‎03-14-2012

DHCP renew issues from some clients

Hello. We have been working through some connectivity issues, roaming and the like. I have recently upgraded our 3000 controllers to the newest 6.1.3.1 AOS. The b speeds have always been disabled and we are not using “Local Probe Request Threshold”. N is disabled on the 105 AP’s because of pauses or hangs that would occur and were very noticeable with citrix applications. Just this week I did the following: Band steering is enabled. Drop boradcasts/multicasts is enabled along with converting ARP to unicast.

 

Before these changes one of the techs found that (on the clients here was working on) the windows event log would show unsuccessful attempts to renew DHCP and sometimes would lead to a disconnection. This would occur much more frequently than the 8 day lease should cause, sometimes over 50 a day. We are still early into looking into this as another part of our overall wireless issues and have not located it yet to a specific location or hardware type. What I am confused about is why the PC is making so many DHCP renew requests. Does this point to the client thinking it lost/regained network connection so it requests to reuse it’s IP? Just curious if anyone has seen this behavior, or if it is to be expected if we are having some connectivity issues.

 

Thanks,

Levin

Guru Elite
Posts: 20,821
Registered: ‎03-29-2007

Re: DHCP renew issues from some clients

The first thing I would do is upgrade my client drivers.

 

The second thing I would do is make sure that that my permit rule for DHCP is not "user any service dhcp permit", but "any any service dhcp permit"

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor I
Posts: 34
Registered: ‎03-14-2012

Re: DHCP renew issues from some clients

They are using the newest drivers available now although this is a 3 year old laptop, a Fujitsu 5010. I verified that the our DHCP rules are as you suggested.

 

I’ll keep looking for something…

Contributor I
Posts: 34
Registered: ‎03-14-2012

Re: DHCP renew issues from some clients

[ Edited ]

More on the DHCP issue... This is for a different model of laptop. From out log server I see this repeating pattern of the below SNMP message at the same time as a DHCP renew request. These renew requests do not coinside with half lease time. If I look at the client in the in the contoller it shows that it has been associated to an AP for over a day but I see several of these same repeating patterns.

 

What are some good commands that I could use help look into this further or look at what the client is doing?

 

capture.jpg

Thanks.

Guru Elite
Posts: 20,821
Registered: ‎03-29-2007

Re: DHCP renew issues from some clients

turn on logging for that client.

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

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