Layer 3 · self-hosting reality check
What it actually takes to self-host OpenWrt
The docs say 64 MB. In practice you want 256 MB for a comfortable install with extras. Here is the honest version — real requirements, real monthly cost, what you will be maintaining, and the one thing that catches people out.
Usually reached from Locked-Down Consumer Routers alternatives, where OpenWrt is one of the picks.
| RAM — documented minimum | 64 MB |
|---|---|
| RAM — what it really needs | 256 MB for a comfortable install with extras |
| CPU | Whatever the router has |
| Disk | 16 MB flash minimum; 128 MB if you want packages |
| Monthly cost | Free, on hardware you already own — it revives routers the vendor abandoned |
| Setup time | An hour, plus the nerve to flash |
| How you install it | flash the firmware image through the vendor's own web interface, or via TFTP recovery |
| Ongoing maintenance | Low once configured, but security updates matter because this is your edge. |
| Where it stops scaling | Home and small-office networks. The hardware limits bind long before OpenWrt does. |
The thing that catches people out
Check the hardware revision, not just the model name. Manufacturers ship v1, v2 and v3 of the same product with completely different chipsets, and flashing the wrong image bricks the device — sometimes recoverable over serial, sometimes not. The revision is printed on the device label; read it before downloading anything.
When not to self-host OpenWrt
That router is your only internet connection and you have no backup path. A failed flash means no network with which to look up how to fix the failed flash.
Every guide here carries this section. A site that only ever tells you to self-host is selling something — the useful answer is sometimes no.
Other Layer 3 self-hosting guides
Common questions
- How much RAM does OpenWrt actually need?
- 256 MB for a comfortable install with extras in practice. The documented minimum is 64 MB, which is the figure at which the process starts rather than the figure at which it works under real use. Whatever the router has alongside it.
- What does self-hosting OpenWrt cost per month?
- Free, on hardware you already own — it revives routers the vendor abandoned This is commodity VPS pricing and excludes your time, which is the larger cost for most people — budget for low once configured, but security updates matter because this is your edge.
- How long does it take to set up OpenWrt?
- An hour, plus the nerve to flash, via flash the firmware image through the vendor's own web interface, or via TFTP recovery.
- When should I NOT self-host OpenWrt?
- That router is your only internet connection and you have no backup path. A failed flash means no network with which to look up how to fix the failed flash.
- What is the most common mistake when self-hosting OpenWrt?
- Check the hardware revision, not just the model name. Manufacturers ship v1, v2 and v3 of the same product with completely different chipsets, and flashing the wrong image bricks the device — sometimes recoverable over serial, sometimes not. The revision is printed on the device label; read it before downloading anything.