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JanKoppe /
Created Jan 24, 2021
Flashing Draytek Vigor130 when it's bricked

We have had a bricked Vigor130, which would not reset. We were unable to reach it even after resetting multiple times.

It was pingable on, but did not reply to any open ports with nmap scans, nor did it act as a dhcp server.

We connected a TTL adapter to the 4 pins on the board to see if there's a serial console on it.


+3.3v | RX | TX | GND    |
View gist:140642d3d0e290d78416c83548a65fef
$ LIBVA_DRIVER_NAME=i965 ffmpeg -y -init_hw_device qsv=hw -filter_hw_device hw -f decklink -i 'DeckLink Quad HDMI Recorder (1)' -vf hwupload=extra_hw_frames=64,format=qsv -c:v h264_qsv -b:v 5M output.mp4
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 10.2.0 (GCC)
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librav1e --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --e
JanKoppe / DesktopVideoUpdateTool
Last active Oct 19, 2020
View DesktopVideoUpdateTool
# DesktopVideoUpdateTool -la
Available Devices:
* DeckLink Quad HDMI Recorder (Gc0272b0)
Firmware is up to date
JanKoppe / gist:96dc92564f223e86e21e28a66523518b
Last active Apr 15, 2020
ugly POC to get billable seconds per project for a gitlab runner from the api
View gist:96dc92564f223e86e21e28a66523518b
import gitlab
from datetime import datetime, timedelta
import dateutil.parser
import pytz
import pprint
import os
JanKoppe /
Last active Dec 9, 2019
36C3: Pretalx XML filter out track
JanKoppe / 1001.conf
Created Jul 2, 2019 — forked from blha303/1001.conf
Asterisk context
View 1001.conf
exten => _X.,1,Set(CALLERID(name)=
exten => _X.,n,Answer
exten => _X.,n,Wait(1)
exten => _X.,n,Playback(1001-recordtype) ; "Enter record type on your phone keypad, followed by the hash key. Press 1 to go to next character"
exten => _X.,n,Read(recordtype,,,si,)
exten => _X.,n,Playback(1001-domain) ; "Enter domain name to retrieve record, followed by the hash key"
exten => _X.,n,Read(domain,,,si,)
exten => _X.,n,Set(RECORD="${SHELL(/usr/bin/ "${recordtype}")}")
exten => _X.,n,Set(ADDR="${SHELL(/usr/bin/ "${domain}")}")
JanKoppe / group_vars_all.ayml
Created May 27, 2019
Ansible Templating issue
View group_vars_all.ayml
multiline: |
JanKoppe / .gitignore
Created May 2, 2019 — forked from smoser/.gitignore
cloud-init ubuntu nocloud example with network config
View .gitignore
JanKoppe /
Created May 2, 2019 — forked from goodjob1114/
how to modify .ova file on linux/Mac using terminal....export vm (OVF 1.0) from virtualbox, then modify some tag and hash value for import vm to ESXi

extract ova files from an archive

$ tar -xvf vmName.ova

modify ovf for some invalid tag

$ vi vmName.ovf

Better SSH Authorized Keys Management

A seemingly common problem that people encounter is how to handle all of your users authorized_keys file.

People struggle over management, ensuring that users only have specific keys in the authorized_keys file or even a method for expiring keys. A centralized key management system could help provide all of this functionality with a little scripting.

One piece of functionality overlooked in OpenSSH is the AuthorizedKeysCommand configuration keyword. This configuration allows you to specify a command that will run during login to retrieve a users public key file from a remote source and perform validation just as if the authorized_keys file was local.

Here is an example directory structure for a set of users with SSH public keys that can be shared out via a web server: