Other-find other DHCP servers on the network-learn RouterO from scratch

The purpose of this tutorial is to find the MAC addresses of other illegal DHCP servers in the local area network.

In many cases, there are always some employees who want to hang up a wireless to facilitate their own mobile phone traffic. Sometimes you put a router, but you don't know how to set it, so you hang it directly under the LAN port of the router. Caused the computer used in the office to get the addresses of other network segments. At the same time, the complexity of the environment is often difficult for IT managers to find, so we need to find out whether there are other routers in the intranet through DHCP sniffing.

Topology:

The network segment of the illegal DHCP server is 192.168.1.0 Universe 24.

1. First copy the MAC of our current DHCP bridge Bridge or interface Interface

The example here, for example, is Ether4.

Click Interfaces > double-click Ether4 to copy the MAC address.

two。 Click IP > DCHP-Server > Alerts

Click the + sign to create a new DHCP Alert rule

Enter your current DHCP interface and MAC address, and then click OK.

Right-click here, select display Unknown Servers, and you can see the illegal DHCP servers in the local area network (if any).

At the same time, we can open it and click Log to see more detailed information in the log.

3. Click Log

The end of this chapter