Running Linux guests using Qemu 5.0+ on a Windows host, using the WHPX accelerator, may fail to start and freezes on this line: [ … ] Freeing unused kernel image memory: … These guests work fine using Qemu 4 on the same Windows host, configured to use a SkyLake CPU type. The issue can be … Continue reading Qemu 5 on Windows Host With WHPX
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config for PXE Booting using isc-dhcp-server
Here is a section of the config file for isc-dhcp-server, showing the syntax to cater for a variety of PXE client types
Invalid Signature with GRUB
A MacBook Pro 7.1 configured for triple booting between MacOS, Linux & Windows failed to load Windows from Grub bootloader, reporting “invalid signature”. Configured with Refind boot manager and a Hybrid MBR, which initially had the Ext4 Linux partition in the MBR but not the NTFS Windows partition, we attempted to chainloader the Windows boot … Continue reading Invalid Signature with GRUB
Radicale IMAP Auth on Debian 9 (Stretch)
Radicale 2.1 CalDAV may fail with the following error messages logged: radicale.log: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] sslv3 alert handshake failure (_ssl.c:720) syslog: … rip=127.0.0.1, lip=127.0.0.1, TLS handshaking: SSL_accept() failed …… imap-login: Disconnected: Inactivity (no auth attempts in 180 secs): user=<>, rip=127.0.0.1, lip=127.0.0.1, TLS handshaking This looks like an incompatibility between OpenSSL and Python urllib regarding SSL connections. … Continue reading Radicale IMAP Auth on Debian 9 (Stretch)
Windows 10 Photos Imports Duplicates
If you use the Windows 10 Photos application to import photos from an SD card or camera, note the following to avoid creating duplicate files: Selecting a folder that was imported previously will cause duplicates of photos. The duplicates will be placed in the same folder but renamed with a number at the end, e.g. … Continue reading Windows 10 Photos Imports Duplicates
PXE Booting Guide
Configure DHCP ServerConfiguration below is for isc-dhcp-server on Linux: # For hardware LAN Boot ROMs:option tftp-server-address 192.168.1.200;filename “pxelinux.0”;# For HyperV Guests:# option 60 = client identifieroption dhcp-client-identifier “PXEClient”;# option 66 = TFTP server nameoption tftp-server-name “192.168.1.200”;# option 67 = Bootfile nameoption bootfile-name “pxelinux.0”; 2. Configure TFTP ServerOn Linux, tftp-hpa is recommended, with a directory structure … Continue reading PXE Booting Guide
OXO Connect with Mikrotik RouterOS
Mikrotik RouterOS based routers can be used as VPN endpoints to provide remote support for Alcatel-Lucent PABX’s. This includes the virtual device images (Cloud Hosted Router), so a dedicated virtual machine can be implemented to provide the VPN responder. At the time of writing this post, Mikrotik does not support EAP on the responding end, … Continue reading OXO Connect with Mikrotik RouterOS
OXO Connect to Linux with Strongswan
Strongswan is a IPsec provider for Linux. It can be used to provide a responder endpoint for connection to phone systems using OXO Connect. Below are the key settings that have been tested to work with a OXO Connect PSK-PSK profile, using Debian Linux: /etc/ipsec.conf: conn ike2psk-clientA auto=add keyexchange=ikev2 ike=aes256-sha2_256-modp2048! # modify to match esp=aes256-sha2_256-modp2048! … Continue reading OXO Connect to Linux with Strongswan
Australian Linux (Debian)
To quickly deploy Debian GNU/Linux with presets for use in Australia, you can use the preseed files provided here. First download and write the Net Install ISO to a USB (or connect to your VM). Boot to the installer and select Advanced -> Automated install -> enter one of the below depending on your requirement: … Continue reading Australian Linux (Debian)
Guacamole on Debian Buster
Apache Guacamole is a HTML5 web application that allows remote access to servers through a browser. It has components to serve SSH or VNC through a web page, useable as an SSL VPN. The version (0.9.9) packaged with Debian Buster (and hence Raspbian for a Raspberry Pi 4) is years old and incomplete, making installation … Continue reading Guacamole on Debian Buster