Many Linux distribution builders like Devuan and Debian produce hybrid ISO image that work on discs and USB sticks. You can make bootable USB sticks by simply copying the image to the USB device with this command dd if=isoimage of=/dev/sdX bs=10240 You can find the device name (X) by looking into dmesg oder lsscsi, and […]
Boot ISO from USB Stick Read More »
If you want to use different source IP addresses based on the logged in user or running service on a Linux computer you can use these simple commands: /sbin/ifconfig eth0:1 NEW-IP-ADDRESS netmask YOUR-NORMAL-NETMASK /sbin/iptables -t nat -A POSTROUTING -m owner –uid-owner USERNAME -j SNAT –to-source NEW-IP-ADDRESS You can use this if the source IP is
Source IP Address Based on User Read More »
Current computers are fast enough to handle more than one user at a time. So I started the project to setup my workstation to support two seats, one for me and one for my gf. Tasks: Two concurrent Xorg sessions both with one keyboard, one mouse, and two monitors Separate audio for both seats Auto
Multi Seat Linux Workstation Read More »
Problem: an android phone is loosing battery very quickly. The battery settings don’t show any app, the display or other reasons for the battery drain. Discussion: I found out that the battery drain is only when connected to WLAN. Then I recognized that it only happens when connected to my WLAN. The mobile phone never sleeps when
Android Battery Drain Riddle! Read More »
I had two or three system crashes on my Linux workstation after upgrading to a new mother board and CPU within some months. This is very unusual for me because stability is the main objective when I build a new a workstation. So I tried to find the reason. Some weeks ago I found this
CPU Bug on Intel Skylake and Kabylake Read More »
Problem: if you separate the management from the normal traffic on a switch you will usually configure the swtich via this mgmt vpn-instance and also backup and restore config files via this mgmt vpn-instance. But if you use the “backup startup-configuration to ..” it always tries to find the tftp server on the normal network Even after changing
FlexFabric 5700 Backup Config to TFTP in MGMT VPN-Instance Read More »
Problem: after installing linux kernel 4.11.1, the dkms package of the nvidia driver does not compile. You find some cryptic error message about ./Kbuild in /var/lib/dkms/nvidia-current/375.39/build/make.log Solution: I uninstalled the debian nvidia package and installed the newer driver from the NVidia homepage: aptitude remove nvidia-installer-cleanup ./NVIDIA-Linux-x86_64-375.66.run After this upgrade nvidia and linux 4.11.1 works again Versions: before upgrade jessie
NVidia Driver on Linux-4.11.1 Read More »
I tested a Ubiquiti access point today. UAP-AC-Lite seems to be a very good and cheap access-point. When you take it out of the box and connect it to the network it gets an IP address using DHCP and waits for a configuration. In this mode it sends broadcasts to find a controller and listens on port
Ubiquiti UniFi the Next Botnet ? Read More »
Problem: Firefox 52 audio does not work without pulseaudio. Discussion: pulseaudio is a bloated audio daemon that often fails. In the last years, when ever audio failed on linux, the quickest solution was to uninstall pulseaudio. But the Firefox developers made the mistake to remove support for the underlying audio driver alsa, and insist on the middle
Firefox Audio is Broken due to PulseAudio Dependency Read More »
Problem: A simple bgp upstream configuration. A small AS with one IP prefix wants to connect to its upstream using BGP. The BGP peerings are up. Sophos receives the expected routes from its upstream, but the upstream router does not receive the expected single prefix. Discussion: an outbound filter list is set to prevent sending other than the
Sophos UTM BGP Announces 0 Prefixes Read More »