Disable IPv6 (AAAA) response in Bind9

Easy steps to disable IPv6 (AAAA) responses by filtering it out when it is doing a DNS request over IPv4.

Restore old-style interface names on Debian 9, 10 and 11

Restore old-style interface names on Debian 9, 10 and 11.

Enable rc.local in Debian Bullseye

With Debian 11 (Bullseye) there is no default rc.local file anymore. But this doesn't mean it has been completely removed. The rc-local service is available but it will need a default config file. Create a file /etc/rc.local with the following content: #!/bin/sh -e # # rc.

Setup a recursive DNS

Whom can you trust? Most hobbyists and IT administrators setup a DNS (Domain Name System) as part of their networks. But most will be setup as caching and forwarding DNS server. When a client sends a request to the local DNS it will check its own cache, and if it

How to keep alive SSH sessions

How to configure the Linux SSH daemon to keep the SSH session alive