Explained: NAT

Your laptop is sitting on a home network. It has an IP address — something like 192.168.1.42 . But that address means nothing to the rest of the internet. It's a private address, invisible beyond your router. And yet, you can open a browser, load a webpage hosted on a server in another country, and the response comes back to exactly the right device, on exactly the right tab. How? The answer is NAT — Network Address Translation. It's on… Read More

Explained: DERP Protocol

Imagine two friends trying to pass notes in a room full of locked doors. They can't reach each other directly, so they slip their notes — already sealed in envelopes — to a trusted courier standing in the middle of the room. The courier doesn't open the envelopes. They just read the name on the outside and pass them along. That, in essence, is DERP. DERP stands for Designated Encrypted Relay for Packets . It's a protocol designed to … Read More

Explained: Node Affinity in Kubernetes

When you deploy a workload to a Kubernetes cluster, the scheduler makes a decision: which node should run this pod? By default it balances across available nodes, picking whichever has the capacity. Most of the time that's fine. But in the real world, infrastructure is rarely uniform. You've got GPU nodes for ML workloads, high-memory nodes for caching tiers, nodes in specific availability zones for compliance, and bare-metal nodes for … Read More

Explained: Taints and Tolerations in Kubernetes

"Not every workload belongs on every node. Taints and tolerations are how Kubernetes enforces that." The Problem They Solve Imagine your cluster has a mix of nodes: some with expensive GPUs, some reserved for critical production workloads, and some designated for a specific team. By default, Kubernetes' scheduler is happy to place any pod on any node — it just looks for available resources. That's a problem. You don't want a b… Read More