<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div><br></div><div><br></div><hr id="zwchr"><blockquote style="border-left:2px solid #1010FF;margin-left:5px;padding-left:5px;color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="border-left: 2px solid #1010FF; margin-left: 5px; padding-left: 5px; color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"dev null zero two" <dev.null.02@gmail.com><br><b>To: </b>"Atlanta Linux Enthusiasts" <ale@ale.org><br><b>Sent: </b>Friday, October 10, 2014 4:04:47 PM<br><b>Subject: </b>Re: [ale] Nmap host up/down status<br><div><br></div><div dir="ltr"><div><div>"nmap -sn host"<br><div><br></div></div>if that is unreliable, you could try "nmap -sn -PE -PP -PM -PO host"<br></div></div></blockquote><div><p style="margin: 0px;" data-mce-style="margin: 0px;">-sn: Ping Scan - disable port scan</p><p style="margin: 0px;" data-mce-style="margin: 0px;"><br></p><p style="margin: 0px;" data-mce-style="margin: 0px;">In my case ping would not get a response from Windows.</p><p style="margin: 0px;" data-mce-style="margin: 0px;"><br></p><p style="margin: 0px;" data-mce-style="margin: 0px;">-PE/PP/PM: ICMP echo, timestamp, and netmask request discovery probes<br> -PO[protocol list]: IP Protocol Ping</p><p style="margin: 0px;" data-mce-style="margin: 0px;"><br></p><p style="margin: 0px;" data-mce-style="margin: 0px;">Are there any cons to doing that? On my tests where a host is down it does not take much longer than just '-sn'</p><p style="margin: 0px;" data-mce-style="margin: 0px;"><br></p><p style="margin: 0px;" data-mce-style="margin: 0px;">Chris</p></div><div><br></div></div></body></html>