Nmap Development: Re: nmap -sP doesn't really send ICMP packets?

From: Fyodor <fyodor_at_insecure.org>
Date: Tue, 6 Feb 2007 17:39:00 -0800

On Tue, Feb 06, 2007 at 10:55:34AM -0500, Burton Windle wrote:
> Hello. nmap 4.20, complied locally on a Debian Testing system running
> Linux kernel 2.6.20.
>
> When doing an nmap -sP (to scan for machines that respond to ICMP Echo
> packets) nmap was reporting that a certain host was down. In fact, the
> machine responds to ICMP pings (Type 8, and sends back Type 0), but
> TCP/80 is filtered (no RST, nothing)

Thanks for the report. Are you running as root? Nmap cannot send
ICMP packets without root privileges. Also, what does --packet-trace
show when you do the scans?

Cheers,
-F

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Received on Feb 06 2007