terawiz Consulting
Network & systems engineering Johannesburg Since 2009

From the fibre to the dashboard.

Terawiz is an independent engineering consultancy. We design and run networks, monitor them properly, host the mail and websites that sit on them, and build the tools operators actually use. The person who answers your call is the person who built it.

Start a conversation → Terawiz Consulting CC · Hosted in South Africa
FIG. 01 — One hour on the desk Replay
  1. 00:00collect41/41 backbone nodes answer · 4/4 core routers reachable over the API
  2. 00:11svcregion DKK: 126 service tunnels · 87 up · 39 down · unchanged since last hour
  3. 00:14facility126 CPE management ports probed · the 39 down tunnels are all unreachable · consistent
  4. 00:31reconanchor host table: 204k rows in 31 s · kept (tagged replies, 90 s budget)
  5. 00:48diff0 new · 2 resolved · 3 ongoing · 1 long-standing (≥ 3 d)
  6. 00:49surge125 of 126 tunnels report down in one sample
  7. 00:49checkfacility pings unchanged · anchor uptime 7w5d · OSPF neighbours full
  8. 00:50verdictcorrelated event · confidence low · state = suspect, not 125 faults
  9. 00:50dispatchWhatsApp: one message, not eighty-six
  10. 00:52reportrendered · emailed · archived · next run at the top of the hour
Events from a real hourly run, times relative Read-only · no changes made
What we do 01 / 05
Selected work 02 / 05
Service-tunnel health model2026 One event, not 125 faults Regional wireless ISP, North West The operator's dashboard kept reporting 125 of 126 client services down. Thirty-nine of them were. We built a state model that needs a second witness before it calls a fault, and carried it through to the hourly report and the WhatsApp dispatch. Read the case → Availability dashboard2026, ongoing A dashboard built for the wall Bus rapid transit operator, Johannesburg Station switches, cameras, biometric readers, fare collection and microwave links on one screen in the monitoring centre, with the measurement rules written down and the raw data a click away for staff. Read the case → Configuration recovery2026 Rebuilding a core router from yesterday's recon PoP router anchoring 128 client tunnels The PoP router died with no current export on file. The previous morning's read-only recon had 48 sections of its configuration. We turned that into a restore script, with every assumption and gap written down. Read the case →

All work, including the smaller things →

How we work 03 / 05
P—01

One engineer, start to finish.

The person who scopes the job designs it, builds it and carries the phone for it. Nothing is lost in a handover because there isn’t one.

P—02

Read-only until it isn’t.

On a live network we look before we touch. Changes are staged as files, backed up and reversible, and the operator applies them unless they’ve asked us to.

P—03

Numbers you can check.

A dashboard that says 125 sites are down when 39 are is worse than no dashboard. Every state needs a second witness, carries a confidence, and links to the raw data.

P—04

Built to be handed over.

Repos, runbooks and the reasons behind decisions ship with the work. You should be able to run it without us, and most clients choose not to.

In numbers · as of October 2026 04 / 05
300+
Network devices under monitoring for clients
500+
Wireless radios tracked through UISP
84
Mailboxes on the hosting desk, 23 domains
2011
First Terawiz app on the App Store
Next step 05 / 05

Something that needs looking at?

Tell us what you’re building, or what keeps breaking. You’ll get a straight answer on whether we’re the right people for it, and a first look is usually read-only.

Start a conversation →