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ICMP_Scanning_25
ICMP Usage in Scanning 25 Copyright Ó Ofir Arkin, 2000 http://www.sys-security.com 00:13:12 prober> 192.168.2.5: icmp: echo reply 00:13:13  router>  prober: icmp: host unreachable Theoretically speaking, using any ICMP type in order to inverse map a network using a Router is possible. The downside would be that some Routers would filter unwanted traffic of certain ICMP types.