[ale] Nmap host up/down status

[dev null zero two]

"nmap -sn host"

if that is unreliable, you could try "nmap -sn -PE -PP -PM -PO host"

if you know certain ports that will be open, you could use -PS80 for a SYN
ping to port 80 or -PU13337 for a UDP ping to port 13337 (you want to use a
closed port).

On Fri, Oct 10, 2014 at 3:53 PM, Chris Fowler <cfowler at outpostsentinel.com>
wrote:

> I have a script I use in Perl that tests a list of hosts via the exit code
> of ping.  Some hosts, like Winders, will ignore ICMP ECHO and this creates
> false alerts.
>
> The idea popped in my head today to use the exit code of nmap and allow it
> to test for me.
>
> Can someone clue me in on the best command like options to nmap that will
> allow it to make a decent determination of a host is up?
>
> I did think about running an initial port scan and then doing an accept()
> test on a TCP socket, but then I decided maybe I'd just let nmap make
> the up/down decision.
>
> Chris
>
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