Mysterious DNS & DHCP

[DanielBHSNIT]

An MX68 is setup to host DHCP for the network.  I have some clients that are picking up a DNS server of 192.168.15.1 even though that IP is not an upstream DNS and it is not listed in our custom name servers.  How can I track where it is getting this assignment from?  The rest of the IP address pool is accurate, it's getting the 192.168.1.x I expect it to get.

[alemabrahao · Accepted solution]

The best way is to identify (in my opinion) the MAC of this "fake" server and try to locate where this MAC is connected.

[DanielBHSNIT]

One of the reasons I am a Meraki advocate; is it would have taken me much longer to find out where it was without a dashboard to search for it in.