Outbound port 25 is closed by default on nearly every cloud platform, and for good reason. This article explains the abuse history behind the restriction, why submission ports and relays are the right answer, and which authentication records decide whether…
A floating address belongs to your account rather than to a server, so failover becomes an API call instead of…
A content delivery network is a cache and a reverse proxy, and everything else follows from those two facts. This…
A database and a web server on the same cloud should not talk over the public internet. This guide covers…
Four ideas cover most of virtual private cloud networking: the address plan, subnets, route tables and gateways. This guide explains…
Registrar, nameserver and zone are three separate jobs, and mixing them up causes most DNS confusion. This guide covers the…
Almost every cloud load balancer is one of two things: a connection forwarder that never reads your traffic, or a…
A cloud VM sells elasticity and a control plane; a dedicated server sells undivided hardware. This guide covers what you…
IPv6 gets enabled for cost, reachability or architecture, not idealism. This guide covers the /64 convention, what each provider actually…
Cloud providers sell network traffic in three ways: metered from the first byte, an allowance bundled with the instance, or…