nmap not scanning networks?

[Alexey Karguine]

On Wed, 16 Jun 2004 14:39:10 -0400 Chuck Swiger <cswiger at mac.com> wrote:

> Alex Povolotsky wrote:
> > Attempt to scan a network with any method except plain ping results in an error:

> > truss nmap -sT -p 21 '172.19.17.*'

> I can confirm the problem, anyway, although I'm not sure it's germane to 
> freebsd-security.  :-)

> > [...]
> > sendto(0x4,0x8094200,0,0x0,{ AF_INET 172.19.17.0:0 },0x10) ERR#49 'Can't assign 
> > requested address'
> > [...]

> > What's strange that man on send(2) doesn't state that EADDRNOTAVAIL can ever be returned from sendto().

> nmap interprets the wildcard character in a network address to include the 
> all-zeros "base network address" and the all-ones "network broadcast address". 
>   I seem to recall that some systems won't let you send traffic to the 
> all-zeros address which might explain the EADDRNOTAVAIL, although my 
> explanation is not entirely satisfactory as there are still problems:

> Consider trying "nmap -sT -p 21 '172.19.17.1-255'", only it results in similar 
> behavior:

> # nmap -sT -p 21 '10.1.1.1-10'

> Starting nmap 3.50 ( http://www.insecure.org/nmap/ ) at 2004-06-16 14:29 EDT
> sendto in send_ip_raw: sendto(4, packet, 28, 0, 10.1.1.1, 16) => Can't assign 
> requested address
> Sleeping 15 seconds then retrying

Try the 'su' command to became root. May be it helps you.

--bm