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Frequent Contributor I
Posts: 83
Registered: ‎09-08-2015

Fragmented PAPI from controller to Airwave

I noticed our firewall is dropping traffic from local controllers to Airwave because it is fragmented.

 

The total packet size the controller is trying to send in this example is '32808 bytes', made up of 23 fragments, each with an IP payload of 1480 bytes.

 

Anyone seen this before?

 

It must be PAPI with AMON data, but strange that it is trying to send such a big packet?

 

The path mtu between controller and Airwave is 1500 bytes, confirmed with ping w/ DF flag set.

 

The below packet capture is showing the fragmented traffic:

1.png

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

Re: Fragmented PAPI from controller to Airwave

The AMON message size can be adjusted:  http://www.arubanetworks.com/techdocs/ArubaOS_65x_WebHelp/Web_Help_Index.htm#ArubaFrameStyles/1CommandList/amon_packet_size.htm?Highlight=amon

 

There is no path MTU discovery for those packets.  It is quite possible that your version of ArubaOS is set to 32k: (arubaOS 6.5.0.1 release notes below)

Screenshot 2016-11-23 at 16.34.25.png

 



Colin Joseph
Aruba Customer Engineering

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

Frequent Contributor I
Posts: 83
Registered: ‎09-08-2015

Re: Fragmented PAPI from controller to Airwave

Cool, we're running 6.4.2.16 so that command isn't available - is there any way we can verify the current buffer size?

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

Re: Fragmented PAPI from controller to Airwave

[ Edited ]

EDIT:

show amon msg-buffer-size



Colin Joseph
Aruba Customer Engineering

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

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