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ARP going nuts?

Posted on 2013-01-04
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Last Modified: 2013-03-01
I have an Android phone connected to company Wi-Fi.  I noticed recently the download arrow is always on.  A little research shows that this is due to broadcast and/or multicast traffic.  I fire up Wireshark and notice something seems to be up with extremely high ARP traffic (~75%).  I did install a new AD / DNS server a few weeks ago.  This could have started at the same time?

Capture1There is no recurring themes with the source & destination.  It varies a ton.

Any ideas to look for?

thanks
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Question by:admineo
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Ugo Mena earned 500 total points
ID: 38744562
How many devices would you estimate are using your wireless network? And what type of switch is the WAP connected to?

If the number of devices using wireless is high, and clients are constantly connecting/disconnecting from the network, you can assume that the ARP traffic (broadcasts, probes and announcements) will be very high.
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by:admineo
ID: 38750701
Sorry for the slow response - had a busy weekend.  

We only have about 20-30 wireless devices spread over 4-5 AP's.  They are connected to L2 HP switches.  

We have some VLAN segmentation.... but something doesn't seem right.
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