Useful Linux Networking Resources

A collection of excellent online resources from other authors, in no particular order.

All links below should open in a separate browser tab or window

Network layers explained with examples

iproute2 utility and IPUP and IPDOWN

iproute2 utility faq

IPv4 Subnet Calculator

This is the bomb. I love the detailed output. Choose whatever info you need. Screenshot below.

Broken Link Sniffer

Free. Simple. Scans internal and outbound (external facing) hyperlinks.

OpenVPN Community Downloads

Latest mainstream version, current gen OpenVPN. Still 2.x as of August 2019. Verison 3.x remains experimental. ;)