IPs, Networking & Domains

Diagnosing Network Issues

How to diagnose network-related issues.

• Diagnosing Network Speed with Iperf

• Diagnosing Network Issues with MTR

SSH

• Using PuTTY

• Mosh

• Using SSHFS on Linux and MacOS X

• Using the Terminal

• Use Public Key Authentication with SSH

• Setting up an SSH Tunnel with Your Linode for Safe Browsing

• Using GNU Screen to Manage Persistent Terminal Sessions

DNS

• Introduction to DNS Records

• DNS Manager

• Reverse DNS

• Common DNS Configurations

• Previewing Websites Without DNS

• Use dig to Perform Manual DNS Queries

• Provide Authoritative DNS Services with NSD on Ubuntu 12.04 (Precise Pangolin)

Firewalls

• Protecting Your Linode with TCP Wrappers

• Control Network Traffic with iptables

• How to Configure a Firewall with UFW

• Introduction to FirewallD on CentOS

VPNs: Virtual Private Networks

• Set up a Hardened OpenVPN Server on Debian 8

• Tunnel Your Internet Traffic Through an OpenVPN Server

• Configuring OpenVPN Client Devices

• Secure Communications with OpenVPN Access Server

• Pritunl VPN Server and Management Panel on Ubuntu 14.04

• Secure Communications with OpenVPN on CentOS 6

• Secure Communications with OpenVPN on Ubuntu 12.04 (Precise) and Debian 7

Squid Proxy/Cache

• Creating an HTTP Proxy Using Squid on Ubuntu 12.04

• Creating an HTTP Proxy Using Squid on CentOS 6.4