NETGEAR M4200

Security Management
343
Managed Switches
Find a Rogue DHCP Server
If you enable DHCP snooping, you can find a rogue DHCP server in the network.
CLI: Find a Rogue DHCP server
1. Check the statistics on the untrusted ports.
In the previous command output, the messages in the DHCP Server Msgs Rec’d column
for port 1/0/27 increased, indicating that the port is connected to a rogue DHCP server.
(NETGEAR) #show ip dhcp snooping statistics
Interface MAC Verify Client Ifc DHCP Server
Failures Mismatch Msgs Rec'd
----------- ---------- ---------- -----------
1/0/1 0 0 0
1/0/2 0 0 0
1/0/3 0 0 0
1/0/4 0 0 0
1/0/5 0 0 0
1/0/6 0 0 0
1/0/7 0 0 0
1/0/8 0 0 0
1/0/9 0 0 0
1/0/10 0 0 0
1/0/11 0 0 0
1/0/12 0 0 0
1/0/13 0 0 0
1/0/14 0 0 0
1/0/15 0 0 0
1/0/16 0 0 0
1/0/17 0 0 0
1/0/18 0 0 0
1/0/19 0 0 0
1/0/20 0 0 0
1/0/21 0 0 0
1/0/22 0 0 0
1/0/23 0 0 0
1/0/24 0 0 0
1/0/25 0 0 0
1/0/26 0 0 0
1/0/27 3704 0 4634