cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

DHCP discovery

Highlighted
Here to help

DHCP discovery

We have had our Meraki switches installed since June but keep getting messages from our system with the latest one coming on December 14. The following 2 examples are what is in the email from the system:
The switch in the network Yuma - switch detected a new DHCP server with the following details:
MAC: d4:ae:52:89:9f:c0
IP: 192.168.11.41
VLAN: 11
Subnet: 192.168.11.0/24

- Cisco Meraki

The switch in the network Yuma - switch detected a new DHCP server with the following details:
MAC: 00:18:0a:4f:00:01
IP: 192.168.20.32
VLAN: 30
Subnet: 192.168.30.0/24

- Cisco Meraki

We are running MS425-32 layer 3 switches for routing and MS350-48FP switches in our data closets. Is this anything to be alarmed at and why is this happening happening every couple of weeks when neither the DHCP servers or the switches has changed?

4 REPLIES 4
Kind of a big deal ww
Kind of a big deal

Re: DHCP discovery

who is running your dhcp services?

 

is 192.168.11.41 is a dell server running dhcp for your network vlan 11?

if not, you should block unknown dhcp servers under switch>dhcp

Kind of a big deal

Re: DHCP discovery

Are 192.168.11.41 and 192.168.20.32 both DHCP servers. If so have you configured them on the DHCP and Routing page so they are routing correctly?

 

If everything is setup correctly and the DHCP hardware isn't changing then I would log a support ticket. It could be a software bug. Also what version firmware are you using?

Meraki CMNO, Ruckus WISE, Sonicwall CSSA, Allied Telesis CASE & CAI
Here to help

Re: DHCP discovery

Yes, 192.168.11.41 is a Dell server utilized for KACE 2000 imaging. While the imaging uses DHCP the KACE is a pass through and not configured (although it could be) for DHCP. 192.168.20.32 is a DHCP server.

Would you furhter explain the DHCP and Router page? I assume you mean on the Meraki switches configuration.

Here to help

Re: DHCP discovery

Got another notice on Saturday: 

The switch in the network Yuma - switch detected a new DHCP server with the following details:

MAC:

00:50:56:be:27:0d

IP:

192.168.20.32

VLAN:

300

Subnet:

192.168.11.0/24

 

- Cisco Meraki

 

Here is some DHCP configuration in attachmentDHCP Capture.PNG

Welcome to the Meraki Community!
To start contributing, simply sign in with your Cisco account. If you don't yet have a Cisco account, you can sign up.