Ubuntu Server

Ubuntu 20.x ~ DHCP Server Setup

Netplan.IO Interface Configuration network: ethernets: ens3: dhcp4: false dhcp-identifier: mac addresses: [ ] gateway4: nameservers: addresses: [, ] version: 2 Install isc-dhcp-server services apt -y install isc-dhcp-server Configure isc-dhcp-server /etc/default/isc-dhcp-server # Defaults for isc-dhcp-server (sourced by /etc/init.d/isc-dhcp-server) # Path to dhcpd’s config file (default: /etc/dhcp/dhcpd.conf). DHCPDv4_CONF=/etc/dhcp/dhcpd.conf DHCPDv6_CONF=/etc/dhcp/dhcpd6.conf # Path to dhcpd’s […]

TACACS+ ~ Linux TACACS+ Authentication using Active Directory

This guide will walk you through the setup of a Linux based TACACS+ Authentication Server, using Ubuntu 18.04 (tested on Ubuntu 16.04 as well) that authenticates against a Windows Active Directory LDAP(S). This guide assumes that you are familiar with installing and configuring a Ubuntu Server and can deploy or have already deployed a Windows […]

Ubuntu 14.04 ~ Setting up a Complete Mail Server

Introduction In this how-to article, we will walk you through building a complete mail server on Ubuntu 14.04.  Building a Linux mail server from ground up can be a painful process unless you do it day in and day out, but we are going to show you have to do it as least painful as […]

Ubuntu ~ GRE Tunnel to Cisco Router

Ubuntu Server Tunnel auto tun1 iface tun1 inet static address {{local-private-ip4-address}} netmask pre-up iptunnel add tun1 mode gre local {{local-public-ip4-address}} remote {{remote-public-ip4-address}} ttl 255 up ifconfig tun1 multicast pointopoint {{remote-private-ip4-address}} post-down iptunnel del tun1 If you are running a firewall on your Ubuntu server, you will need to make sure to allow GRE tunnelling […]