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nmap does not find alive hosts with ping scan

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linux-howto

http://serverfault.com – I try to ping scan my local network using nmap, but it doesn't seem to find machines that are for sure alive. It responses to ping but on to ping scan. Results for ping: $ ping 192.168.0.2 PING 192.168.0.2 (192.168.0.2): 56 data bytes 64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=1.585 ms And output of tcpdump: $ tcpdump -i fxp0 -n host 192.168.0.2 12:43:07.624911 IP 192.168.0.222 > 192.168.0.2: ICMP echo request, id 61023, seq 0, length 64 12:43:07.625029 IP 192.168.0.2 > 192.168.0.222: ICMP echo reply, id 61023, seq 0, length 64 But when I try to use nmap it doesn't see it i (HowTos)