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MS120 handing out a random private address (192.168.45.0)

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MS120 handing out a random private address (192.168.45.0)

Hi All,

 

Just wondering if anyone has seen this issue before?  I have a user who usually works off of the wireless which hands out an address on the LAN (192.168.1.0/24).  For one reason or another, he was not able to connect to the wireless so we have patched him temporarily.

 

Upon patching we found that he was getting a random private address not associated with any VLAN on the corporate network.  Initially, I thought that the issue could be local and had the user show me that there was no static IP's on the network adapters of the PC. Normal ipconfig/release && ipconfig/renew had no effect. 

 

I have assigned him a static IP temporarily so he can work, but I still see the switch trying to hand out a 192.168.45.0 address.

 

Any ideas?

access switch port.PNGMS120 switchport access config

 

thanks,

Pete

 

1 ACCEPTED SOLUTION

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Re: MS120 handing out a random private address (192.168.45.0)

Found out someone had started a DHP server on the network using the tag of 1, which was causing the conflicts.

 

All sorted now.

3 REPLIES 3
Here to help

Re: MS120 handing out a random private address (192.168.45.0)

Found out someone had started a DHP server on the network using the tag of 1, which was causing the conflicts.

 

All sorted now.

Kind of a big deal

Re: MS120 handing out a random private address (192.168.45.0)

@peterwarwick  I suggest you setup the below alert within your dashboard.

 

Screen Shot 2019-09-06 at 1.18.17 PM.png

 

 

Meraki CMNO, Ruckus WISE, Sonicwall CSSA, Allied Telesis CASE & CAI
Kind of a big deal

Re: MS120 handing out a random private address (192.168.45.0)

You can also lock down your network to known authorized DHCP servers only, completely preventing rogues from ever happening.

 

https://documentation.meraki.com/MS/Monitoring_and_Reporting/MS_DHCP_Servers

 

 

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