With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnrNotifMACAddress
cnr Notif MAC Address
1.3.6.1.4.1.9.9.120.1.2.2
The offending MAC address which caused a duplicate IP address to be detected.
Back to CISCO-NETWORK-REGISTRAR-MIB MIB page.
IPHost Network monitor allows you to monitor cnrNotifMACAddress on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.
