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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker 25 Dec 2017

      Fun puzzle: can you make a pure analog (bonus: unpowered) ethernet throttling knob?

      2 replies 3 retweets 2 likes
    2. Robert Ou‏ @rqou_ 25 Dec 2017
      Replying to @RichFelker

      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.

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 25 Dec 2017
      Replying to @rqou_

      That's one ingredient but to get meaningful throttling you need more.

      1 reply 0 retweets 0 likes
    4. Robert Ou‏ @rqou_ 25 Dec 2017
      Replying to @RichFelker

      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).

      1 reply 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 25 Dec 2017
      Replying to @rqou_

      Thus why you start by eliminating it, forcing 10/100.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 25 Dec 2017
      Replying to @RichFelker @rqou_

      The problem then is how to throttle from 10/100 Mbit down to kbit rates. Basic idea: simulate collisions.

      9:54 PM - 25 Dec 2017
      • 1 Retweet
      • Jonas Termansen
      1 reply 1 retweet 0 likes
        1. New conversation
        2.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 26 Dec 2017
          Replying to @RichFelker @rqou_

          Collision detection is off if full duplex is negotiated

          1 reply 0 retweets 1 like
        3. Evan Plaice‏ @evanplaice 26 Dec 2017
          Replying to @erincandescent @RichFelker @rqou_

          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.

          1 reply 0 retweets 0 likes
        4.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 26 Dec 2017
          Replying to @evanplaice @RichFelker @rqou_

          100Mbit still does full duplex

          1 reply 0 retweets 0 likes
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