The "throwing star lan tap" deliberately puts capacitors on some data lines to force the network to fail 1000Base-T and fall back to 10/100 where passive taps are possible. Probably not what you had in mind though.
-
-
-
That's one ingredient but to get meaningful throttling you need more.
-
I don't think this is possible for 1000Base-T. That has a somewhat complicated physical layer that involves both directions transmitting on the same wires simultaneously (and hence why passive taps do not work).
-
Thus why you start by eliminating it, forcing 10/100.
-
The problem then is how to throttle from 10/100 Mbit down to kbit rates. Basic idea: simulate collisions.
-
Collision detection is off if full duplex is negotiated
-
Then force half-duplex by cutting 2 (ie 1 tx, 1rx) of the pairs. Specifically, the outer 2. An ethernet NIC should detect the change and fallback to 100MbE.
-
100Mbit still does full duplex
- 1 more reply
New conversation -
-
-
1GbE uses all 4 pairs in an ethernet cable, 100MbE only uses 2. To force fast ethernet wire a 4P2T switch inline on the 2 outer pairs. This is a simple, no-power way to toggle 1000/100/100 ethernet down to 100/10.
-
To mess with speed further requires screwing with the integrity of the signal. Ethernet uses balanced signaling, meaning the signal is sent across both sides of the pair and compared on the receiving end to cancel out noise. To force packet loss we need to screw with the balance.
-
To do this we could probably screw with the signal integrity on one side of the pair. Maybe we can use inline capacitors to partially filter one side of the pair and screw with the balance. Maybe we could use a variable resistor inline to simulate logitudinal imbalance.
End of conversation
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.