JP Vossen on 15 Nov 2008 11:11:50 -0800

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Re: [PLUG] network hardware follies

> Date: Sat, 15 Nov 2008 09:06:23 -0500
> From: Eric <>
> I'm trying to reset a Linksys RTP300 that my wife obtained for me from 
> Freecycle.  It is a Linux-powered VoIP router.  The history of the device is 
> unknown but I would presume that it's a former Vonage unit.  That may be a 
> totally bogus assumption, I'll admit, but where it came from is irrelevant IF I 
> can get it to work.

Hopefully the URL Casey sent will help, but if not...


> What kind of nmap scan would be the quickest and still be most likely detect the 
> unit?  I tried a ping scan over the home network and it takes about 40 seconds 
> to scan the range.  At that rate the entire range 
> will be about 3 hours.  I'm trying not to think about the range. 
> Okay, okay... I thought about it: 728 hours or about 1 month.  I'd rather try #2 
> or #3 first :-)

Yeah, nmap has a gazillion options.  But port 80 pretty much has to be 
there, right?  So:
	nmap  -P0 -p 80

# -P0 = Do not ping (ICMP) first
# -p  = Ports to scan

But before you do that, keep reading.

> Ideas and suggestions are really welcome!  At this point I'm starting to run out 
> of ideas and #3 is starting to look better and better :-(

Why not try to make it tell you?  Install Wireshark on your machine, 
then plug the cross-over cable in.  Start Wireshark as root and sniff 
promiscuously (I just like saying that :).  Then power up the gadget and 
watch Wireshark's capture.  Once the gadget is up, try plugging in a 
phone and trying to make a call.  Surely one of those actions will make 
the gadget try to send some packets someplace, and give you a clue.

Good luck,
JP Vossen, CISSP            |:::======|        jp{at}jpsdomain{dot}org
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