You could try and slow your scans down by using the -T option. The
scans will take longer, obviously, but you would get better results if
packets are being dropped due to congestion.
If you try and run a selective port scan immediately after the 1-1024
or 1-65535 scan, do you get the original results, or the supposed
erroneous ones from the 1-1024 . . . ?
I have had a firewall/IPS black-hole me after performing a multiple
port scan. Slowing the scan _way_ down works, but it's slow. But, If
there isn't a firewall on the other side then it shouldn't be an
issue.
hth,
Reid
On 28 Apr 2006 13:41:11 -0000, 09Sparky@gmail.com <09Sparky@gmail.com> wrote:
I am trying to run Nmap both on specific ports and then multiple ports (1-1024,
1-65535, etc). My issue or is this: when I run small port scans; my results
come back fine (open, closed, filtered). I have confirmed that the results are
accurate. However, when I attempt to scan multiple ports I get various
unreliable results. For instance, a port that I could have confirmed either
open or closed may show up as filtered or the opposite.
No configuration changes have been made and no firewall on remote site.
Additional Notes:
-I am running over the Internet
-I am running from behind a Netgear Firewall/VPN/Router (FW114) with NAT
-Cable/DSL Connection (Fast)
I am wondering if my router is timing out or perhaps I am performing a DOS
of my own router. Does any have any thoughts or experienced this type of
problem? If so, does anyone have any recommendations?
Thanks,
09Sparky
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