troubleshooting Question

DHCP Problems with Rouge Router

Avatar of Salonge
Salonge asked on
Network ManagementRouters
20 Comments1 Solution571 ViewsLast Modified:
I really need help.  I have a site that uses DHCP for all its wireless and wired devices.  The router is a Cisco 2901 and hands out IP's dynamically with no problems until this past week.  It appears that whenever a computer is turned off and back on, the IP address is changed to a public IP - 192.168.0.x.  After some investigation, I realized that it is a device somewhere, we are unable to locate it, that is handing out public IP's.  This is forcing me to put static IP's on our computers.  I have the mac address and was able to find the brand name of the device, but unable to find the device itself.  I put the public ip gateway in one of the computers and was able to pull up a login page, but all the default username/password combination does not work.

Is there a way
1. to find the location of the device;
2. Block it, so that our network won't pick up the addresses.

Thanks so much

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