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Notes from the dataplane

How SiHA works, and the ideas it's built on — kernel-bypass networking, immutable systems, and declarative infrastructure.

Platform

An immutable OS that upgrades itself

One signed image, atomic A/B upgrades, and automatic rollback when a new version misbehaves.

2026-06-14
Dataplane

VPP: a graph of packet nodes

Vector Packet Processing forwards batches of packets through a directed graph — and that's why it's fast.

2026-05-24
Dataplane

DPDK: escaping the kernel

Why SiHA hands its NICs to userspace and never lets a packet touch the Linux network stack.

2026-05-10
SiHA

A lion-hearted firewall / router / load-balancer appliance. VPP dataplane, declarative control plane.

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© 2026 · Built at Enix · SiHA — “lion”.