Which means that the ‘out of band’ cannot get ‘out of your subnet’, and probably won’t even get ‘past your Ethernet hub/switch/router/whatever’ into which the other end of your Ethernet cable is plugged.
Probably, unless you send it ‘loud enough’ to overwhelm the switch and get bleedthrough to the other lines on the switch. But I’d be surprised if you could get it past the NEXT switch without damage to the first one.
Just guessing, though. Anybody have some switches they don’t mind destroying for a little test? ;-)
(This reminds me a little bit of the ‘rumor’ of a ‘flashing eye’ that a hacker could manage to display on the system console of a UNIVAC 1110 series computer if they knew the secret incantations (and more than one was required, let me tell you!).
Turns out, that in this case, the rumor was true, just not in the way we’d heard it.)
Perhaps they’re putting digitized DTMF into the packet and sending it to a special port on the other end? (you know, port 80 is used for http, etc).
Rusty
From: PLUG-discuss [mailto:plug-discuss-bounces@lists.phxlinux.org] On Behalf Of Eric Oyen
Sent: Friday, December 01, 2017 11:52 AM
To: Main PLUG discussion list
Subject: Re: Dtmf over rj45
the kernel of truth is that you can use cat-x cable to do this, but any ethernet switches in the line will either interrupt completely or filter out the extraneous data as noise. In either case, your "out of band" transmissions will be eaten by the first switch they come across.
from the central offices of the Technomage Guild, the "you can't get from here to there" dept.
On Dec 1, 2017, at 8:09 AM, Aaron Jones wrote:
Not sure myself honestly. The guy was using buzz words like “out of band transmission” and claiming they could use dtmf and the intel me to send “untraceable” data without the use of IP.
I am trying to be objective about it but it seems like it wouldn’t be an effective method of getting data out of a network.
So potentially there is a kernel (heh) of truth in there. Who knows right now I guess.
Steve is right you can use RJ45 to transmit. The signal but Ethernet switch are expecting Ethernet frames.
Are you talking about embedding this sort of functional noise into a line being used by ethernet? and yes most quality switches would try to clean up the noise in order to secure the data unless it just created enough of an interruption to just disrupt the connection as a whole.
RJ45 is a socket type so you can wire it to do whatever you want. you can use cat 4,5,6 cable to transport anything you want. I know multiple sites that wired ethernet cable for POTS just because it gave them the ability to do a number of things based on need.
Any one have any experience with dtmf (beeps and boops over phone) but using rj45 instead of rj11?
I viewed a claim that the intel me can produce dtmf instructions that will be regarded as noise by tools like wireshark and can be used to transfer things like encryption keys surreptitiously over the net without being seen by monitoring tools.
Essentially data is hidden in sight as noise on the line and picked up somewhere else.
Rj11 phone line can do this. But can it be done with rj45? Wouldn’t the first switch it hit just smooth noise?
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