Re: NMap Reports Invalid Scan Results in OS X While on VPN

[David Fifield <david () bamsoftware com>]

On Thu, Mar 07, 2013 at 11:46:25PM -0500, wefewf wefewfwe wrote:
> There appears to be an issue running nmap scans while on a VPN on Mac OS X
> Mtn Lion (Noticed it in Lion as well).  I noticed this bug  while using a
> Cisco VPN, NMap 6.25 on OSX.  The following thread describes the issue
> better than me writing it up again:
>
> http://serverfault.com/questions/338738/running-nmap-over-vpn-on-mac-os-x-10-7-lion-fails
>
> I noticed this particularly when I got the host down on the Host OS running
> nmap on OS X (I knew the host was up though), but different (and valid)
> results when running Nmap on a NATed guest VM using Backtrack.

I've tried to reproduce this with a Cisco IPsec VPN on Mountain Lion,
and was not able to. I suggest that you try commands like
        nmap --iflist
        nmap --route-dst 8.8.8.8
with the VPN disabled and enabled, and compare the output for clues as
to what may be going wrong.

David Fifield
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