Re: nmap not working properly...showing ports as filtered, but ncat banner grab works

['David Fifield' <david () bamsoftware com>]

On Mon, Jan 16, 2012 at 04:32:51PM -0500, Joseph McCray wrote:
> Like I said, I think that I was unclear in my previous post. I don't think
> nmap is broken, I believe that I have a misconfiguration somewhere.
>
> I just attempted to build from svn.
>
> Now I keep getting the following error:
>
> route_dst_netlink: can't find interface "venet0"
>
> Googling the error helped me find some people with similar proplems:
>
> http://zitstif.no-ip.org/?p=581
> http://old.nabble.com/Re%3A-ARP-scan-%28-%29-bug-in-Nmap-5.59BETA1-p32390886
> .html
>
> Most similar to my issue:
> http://talk.maemo.org/archive/index.php/t-48673.html
>
> A generic scan with no options will run as a regular user, but not as root.
>
> # ./nmap --iflist
>
> Starting Nmap 5.61TEST4 ( http://nmap.org ) at 2012-01-16 16:30 EST
> INTERFACES: NONE FOUND(!)
> ROUTES: NONE FOUND(!)
> root@shrek:/toolz/nmap-source# su j0e
>
> $ ./nmap --iflist
>
> Starting Nmap 5.61TEST4 ( http://nmap.org ) at 2012-01-16 16:31 EST
> INTERFACES: NONE FOUND(!)
> ROUTES: NONE FOUND(!)

Thanks for doing these tests. This must be a configuration that isn't
accounted for yet.

The proximate cause is a switch from using an Nmap-specific interface
loop based on SIOCGIFCONF to using libdnet on all platforms. libdnet
prefers to read /proc/net/dev if present.

So can you show us the contents of your /proc/net/dev?

David Fifield
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