How to ignore scan from a host

["Tony Wong" <tony.wong () stanford edu>]

how can I ignore a host from scanning? 

Tried putting ip address/subnet mask in here but alert was still logging
the host scanning

preprocessor portscan-ignorehosts: ip/netmask

ICMP PING NMAP [**] [Classification: Attempted Information Leak]
[Priority: 2] {ICMP}


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