Re: nmap errors on *BSDs (noted on NetBSD and MacOSX, so far) (traceroute)

[David Fifield <david () bamsoftware com>]

On Tue, Mar 23, 2010 at 11:07:46PM +0100, Patrik Karlsson wrote:
> Hmm, I just ran nmap with the traceroute option on Snow Leopard.
> I'm seeing a single hop for any host I'm scanning:
>
> sudo ./nmap -sn --traceroute scanme.insecure.org
>
> Starting Nmap 5.21 ( http://nmap.org ) at 2010-03-23 23:03 CET
> Warning: Unable to open interface vboxnet0 -- skipping it.
> Nmap scan report for scanme.insecure.org (64.13.134.52)
> Host is up (0.0027s latency).
> rDNS record for 64.13.134.52: scanme.nmap.org
>
> TRACEROUTE (using port 80/tcp)
> HOP RTT     ADDRESS
> 1   3.27 ms scanme.nmap.org (64.13.134.52)
>
> Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

Try with --packet-trace to see what's going on. Probably your first-hop
router is resetting outgoing TTLs to some fixed value.

David Fifield
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