Nmap not ping scanning local network

[jpforte]

Hi,

I just noticed that on all pfsense 2.0 machines I have installed that I cannot ping scan the local network machines everything but the local configured port fails. I can however ping them machines properly.

example: ping 172.16.0.128  (works, shows pings)

However: nmap -sP 172.16.0.128 (says not responding to pings)

when I do the whole subnet: nmap -sP 172.16.0.0/24 (takes forever then reports that 172.16.0.1 is the host that is up).

Thoughts?!

Jim

[tommyboy180]

Just a thought: nmap tries to detect your primary interface and uses the address that you are scanning but if that doesn't work try -S to specify an interface. That should work.

[cmb]

nmap -sP is not the same as 'ping', use 'nmap -sP -PI' if you want ICMP echo requests.

[tommyboy180]

Even better.