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  • Arpwatch flip flop and ethernet changes

    Over the past week, I've started getting a lot of emails from arpwatch. I'm not sure how to figure out what has changed that this is now happening.

    Typically I'm getting the following messages but also a few "changed ethernet address". The "changed ethernet" are not very often though.

    flip flops

    Interestingly enough this is only happening with an replacement wifi router in assess mode, one Macbook, an iMac and 3 iphones. They are all using the WIFI network segment to connect. But we have other devices (Android, Chromecast) using WIFI on our network and they aren't having this problem. There are no issues on the wired segment of the network.

    The access point has the same settings as the one it replaced. It had no problems like this before. I'm not 100% sure if this started happening after the replacement router was installed or if it started when arpwatch was updated in the 7.5 upgrade. The earliest arpwatch emails are from May 15th.

    I've done a bunch of Googling and can't find anything relevant to my network or situation that might cause this. I am wondering if the Access Point is running a DHCP server despite it being disabled but I don't know how to check.

    I would appreciate any suggestions on how to debug as the 20+ emails per day from arpwatch are getting very tedious.

    Thanks in advance.