In some cases, when connecting to a Linux host via SSH, there can be a very long delay before a password prompt appears (from 30 seconds up to 2 minutes).
On most modern Linux distros, you can enable the local caching of DNS queries by using the built-in systemd-resolved service. In this article, we will take a look at how to speed up the resolution of DNS queries by using systemd-resolved local client caching on Debian and Ubuntu. This allows you to reduce DNS resolution delays if you have an unstable network connection, when DNSSEC is enabled, and on hosts that make a large number of DNS queries (for example, mail servers).
Modern versions of Ubuntu offer many different ways to configure network settings, and it’s easy to get confused. In this article, we will have a look at how to configure network settings in Ubuntu using Network Manager, Systemd Networkd, Netplan, and the static configuration file /etc/network/interfaces (legacy way).
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Before starting an in-place upgrade from Debian 11 to the new Debian 12 (Bookworm), we recommend backing up your operating system.
Continue reading “Updating Debian 11 to Debian 12 (Bookworm)”
Split Brain DNS allows you to configure the DNS server to return different responses depending on the request source address (IP subnet). In this post, we will look at how to configure Split DNS on Windows Server using DNS policies (supported on Windows Server 2016 and newer).
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Linux localesettings determine the current operating system regional settings used in the terminal and GUI (such as date and time format, currency symbols, available character sets, etc.). This article looks at how to check or set locale settings on Linux distros (Ubuntu, Debian, Mint).
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You might encounter the Unsupported CPU error when installing or upgrading VMware ESXi hosts to 7.x or 8.x on hosts with older processor models.
Continue reading “How to Install and Run VMware ESXi on Unsupported CPU”
On Debian and Ubuntu operating systems with a graphical user interface, the sleep (suspend) and hibernation modes are enabled by default.
Continue reading “Disable Suspend and Hibernation Modes in Ubuntu/Debian Linux”
Trust relationships between AD domains allow users from one domain to authenticate to another domain. Trusting relationships are most often configured when merging or migrating multiple organizations.
Continue reading “Create Trust Relationship Between Active Directory Forests”
Active Directory Certificate Services (AD CS) allows you to deploy your own PKI infrastructure on a domain network and use it to issue and manage certificates. In this article, we will look at a typical Certification Authority (CA) deployment scenario: installing a root CA and subordinate enterprise AD CS on two Windows Server hosts, and configuring Group Policy to issue certificates in a domain.
Continue reading “Install Active Directory Certification Authority (ADCS) on Windows Server”