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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for September 20th, 2021

Reggefiber NTU: convert blind cap to become pure fiber, so no ethernet media converter is needed

Posted by jpluimers on 2021/09/20

Some links:

Edit 20210922: added the below Twitter thread, added searches for the now unavailable videos

[] Joel Haasnoot on Twitter: “Freedom laat je alles zelf doen zonder monteur, maar risico als het stuk gaat is 2000-6000 euro om nieuwe splice te doen. Maar er zijn dus ook geen filmpjes oid :)… “

Joel Haasnoot‏ @webguy· Sep 20

Ik moest mij hier een paar maanden gelden hier induiken, maar enigszins bizar hoe weinig documentatie of Google-baar spul is. Er wordt vanuit gegaan dat sysadmins dit maar leren…
Jeroen Wiert Pluimers‏ @jpluimers· Sep 20

Inderdaad. Helaas is het youtube filmpje inmiddels private. Wat heb jij uiteindelijk gedaan?
Joel Haasnoot‏ @webguy· Sep 21

Paar problemen, deels omdat ik een van de eerste 128 oid was bij Freedom en er geen verhuisproces was. Had eerst een patchcover nodig voor nieuwe TK-01 ( …) en daar zat geen patchkabel bij (geen NTU nodig bij Freedom), want dat was opeens een SC ipv LC eind.
Joel Haasnoot‏ @webguy· Sep 21

Uiteindelijk had KPNNetwerkNL 4 weken nodig om licht op de lijn te krijgen… Ik heb nu nog een patchkabel + optics liggen voor Mikrotik router, maar vooor nu nog maar even via router.
Replying to @webguy @jpluimers
Freedom laat je alles zelf doen zonder monteur, maar risico als het stuk gaat is 2000-6000 euro om nieuwe splice te doen. Maar er zijn dus ook geen filmpjes oid :)



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Posted in fiber, Internet, Power User | Leave a Comment »

Low cost remote IP KVM and control, is it possible?

Posted by jpluimers on 2021/09/20

A long time ago, I bought one [Wayback/] SpiderDuo Local and Remote KVM Over IP | Lantronix, which – without power control unit – was already some USD 400 (while writing this in fall 2021, the price has increased to almost USD 600 []).

1PORT Local + Remote USB Securelinx Spiderduo KVM Over IP : Electronics -

It was about the only “affordable” remote KVM over IPv4 available and by now has a big drawback: it’s based on Java in the browser, which is a pain in the ass to keep working.

So I went looking for alternatives and found only two reasonable ones:

I will likely go for the Pi-KVM ; it’s on kickstarter right now

Not only that, but I found a few comparisons favouring PiKVM:

I found the Pi-KVM via [] Solar Designer on Twitter: “PiKVM v3 HAT, “Raspberry Pi based open-source KVM over IP” by @mdevaev, is now funded on Kickstarter “

At USD 145 or less on kickstarter (excluding a Raspberry Pi 4 or power brick, so add some USD 50 for those), it is way cheaper than the SpiderDuo above which I bought some 5 years ago.

The kickstarter closes in about a week from now, so if you consider one: don’t be late! [Wayback/] PiKVM v3 HAT by Maxim Devaev — Kickstarter shows what you get:

  • The PiKVM v3 HAT board for Raspberry Pi 4
  • USB-C bridge board – to connect the HAT with Pi over USB-C
  • ATX controller adapter board and wiring – to connect the HAT to the motherboard (if you want to manage power supply through hardware)
  • 2 flat CSI cables
  • Screws and brass standoffs

You will also need:

  • Raspberry Pi 4 with 2Gb RAM or more
  • MicroSD card
  • USB-C to USB-A cable
  • HDMI cable
  • Straight Ethernet cable (for the ATX expansion board connection)
  • Power supply unit (5.1V 3A USB-C, recommended by the Raspberry Pi)

You can use our free 3D printing case design to build a beautiful complete unit or wait a bit for the official PiKVM metal case we are working on!


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Posted in Hardware, KVM keyboard/video/mouse, Power User | Leave a Comment »

Mikrotik RouterOS “/ip ssh” setting not available from WinBox and defaulting to insecure?

Posted by jpluimers on 2021/09/20

Still need to research this further:

Somewhere around 6.44, when upgrading an existing RouterOS device, this snippet became part of the configuration:

/ip ssh
set allow-none-crypto=yes forwarding-enabled=remote

A few remarks:

  • I could not find anything in WinBox that is equivalent.
  • This sounds very insecure, so I have run this script:
    /ip ssh
    set allow-none-crypto=no forwarding-enabled=no

    which makes the snippet to disappear (because they are default settings according to [WayBack] Manual:IP/SSH – MikroTik Wiki).

    Like usual, the on-line documentation is dense and insufficiently clear, hence my measure.

In the future, I need to decipher these posts (via [WayBack] winbox ssh allow none crypto – Google Search and [WayBack] winbox ssh forwarding enabled remote – Google Search):


Posted in Internet, MikroTik, Power User, routers | Leave a Comment »

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