On Thu, 26 Oct 2006 10:00:10 -0400, "Michael D. Spence" <spence@panix.com>
wrote:

> > -----Original Message-----
> > From: netbsd-users-owner@NetBSD.org 
> > [mailto:netbsd-users-owner@NetBSD.org] On Behalf Of George Georgalis
> > Sent: Thursday, October 26, 2006 8:48 AM
> > To: netbsd-users@netbsd.org
> > Subject: Re: traceroute only shows beginning and end
> > 
> > 
> > On Wed, Oct 25, 2006 at 06:58:53PM -0400, Michael D. Spence wrote:
> > >I recently got a new FIOS connection from Verizon.  There's a
> > >fancy router that comes with the package.  It works well, except
> > >when I do a traceroute via the router, every hop has the endpoint's
> > >address (although there do seem to be the correct number of hops).
> > > 
> > >What would make traceroute do this?  Could it be some sort of NAT
> > >misconfiguration?  (It's definitely the router, because if I use my
> > >other connection, all is correct.)
> > 
> > weird. does pkgsrc/net/mtr do the same thing?
> > 
> 
> I expect it will.  On further investigation, tcpdump reports that the 
> "time exceeded" packets have the wrong source address, which really
> sounds like a bug in the router to me.
> 
Bug or feature?  Maybe Verizon doesn't want you to see the network --
after all, you can't map out phone switches that way...

		--Steven M. Bellovin, http://www.cs.columbia.edu/~smb