Environment
Novell ZENworks 10 Configuration Management with Support Pack 2 - 10.2 Discovery
Novell ZENworks 10 Configuration Management with Support Pack 1 - 10.1 Discovery
Novell ZENworks 10 Configuration Management with Support Pack 1 - 10.1 Discovery
Situation
Under certain conditions the NMAP discovery task finds devices listed as 'unknown' for IP addresses that are NOT owned by any device. It seems that this happens when NMAP discovery times out and ZCM just assumes that there must be devices there, and flags a whole range of IP addresses as 'unknown'.
Resolution
This scenario is coverered in the ZCM 10.x documentation as An IP address is listed as Unknown by the NMAP discovery if it is a member of DNS and has not been assigned to a device in section D.0 Troubleshooting Discovery, Deployment, and Retirement in the Appendixes for ZENworks 10 Configuration Management Discovery, Deployment, and Retirement Reference