[unisog] Identifying if node is a router or PC

John Kristoff jtk at depaul.edu
Thu Jul 19 15:33:45 GMT 2007


On Sat, 14 Jul 2007 15:53:42 -0500
"Frank Bulk" <frnkblk at iname.com> wrote:

> Does anyone know of a program, or preferably, a Perl module, that would
> allow me to identify if a node is a computer or a broadband router?
> Information beyond that (such as OS or broadband router model number) would
> be a bonus.

Sometimes they are also a "proxy" DNS box (forwarder).  See if you can
solicit some sort of a DNS response to a valid query on UDP port 53.  If
so, chances are good it's some sort of NAT device.

John


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