Dual WAN Failover: How Businesses in Accra Stay Online When Their Primary Link Fails

Every business in Accra that depends on the internet has, at some point, experienced the same moment: the connection drops, work stops, and someone picks up the phone to call the ISP. The ISP's support team logs a ticket. An engineer is dispatched. The ETA is four hours.

Four hours of downtime. No cloud applications. No VoIP. No email. Staff sitting idle or working around the problem in ways that create their own complications.

For businesses where internet connectivity is a core operational dependency — and that is most businesses today — a single internet connection is a single point of failure that carries unacceptable risk.

Dual WAN failover is the solution. This article explains how it works, what lossless failover means and why it matters, and how to implement it properly.

What Is Dual WAN?

Dual WAN means having two separate internet connections — from two different providers, using two different technologies — and routing your traffic intelligently between them.

In normal operation, one connection is designated as the primary and carries all traffic. The second connection is on standby, active and monitored, ready to take over.

When the primary connection fails — or degrades beyond an acceptable threshold — traffic is automatically redirected to the secondary connection. Your staff continue working. The failover happens in the background.

When the primary connection recovers, traffic fails back automatically.

The result is a business that stays online through outages that would otherwise be catastrophic.

Why Two Different Providers and Technologies Matter

The value of dual WAN depends entirely on the secondary connection being genuinely independent from the primary. If both connections use the same underlying infrastructure, the same physical cable, or the same provider's network, a single failure can take both down simultaneously.

In Accra, a common and effective combination is:

Primary: Dedicated Internet Access (DIA) via fibre or wireless from a business ISP. Fixed bandwidth, consistent performance, contractual SLA.

Secondary: Starlink satellite internet. Completely independent infrastructure — it uses low-earth orbit satellites, not any terrestrial cable or wireless network. A fibre cut, a power failure at an exchange, or a last-mile outage that takes down the primary connection has no effect on Starlink.

This combination provides genuine redundancy. The secondary connection is not just different — it is architecturally independent.

What Lossless Failover Means

There are two types of failover: lossy and lossless.

Lossy failover is the simpler approach. When the primary connection fails, the router switches to the secondary. Active sessions — VoIP calls, VPN connections, video conferences — are dropped. Users reconnect manually. There is a noticeable interruption, typically 10 to 60 seconds, before connectivity is restored.

For many businesses, lossy failover is acceptable. Connectivity is restored quickly, even if active sessions are interrupted.

Lossless failover is more sophisticated. Active sessions continue uninterrupted through the failover. A VoIP call in progress when the primary connection fails continues on the secondary connection without the caller or the recipient noticing. A VPN session, a cloud application, a video conference — all continue as if nothing happened.

Lossless failover requires the router to maintain active monitoring of both connections simultaneously, to load-balance or policy-route traffic intelligently, and to execute the failover without dropping the session state.

This is technically complex. It requires capable routing hardware and a carefully designed configuration. But for businesses where a dropped VoIP call at the wrong moment or an interrupted transaction carries real cost, lossless failover is worth the investment.

How IJA Implements Dual WAN

IJA deploys dual WAN using MikroTik routers running RouterOS v7 or higher — enterprise-grade routing hardware that supports the advanced scripting and policy routing required for lossless failover.

The configuration monitors both WAN connections continuously. It uses scripted health checks — not just whether the interface is up, but whether the connection is actually passing traffic and meeting latency thresholds — to determine the state of each link.

When the primary connection degrades or fails, the failover script executes automatically. Traffic is rerouted to the secondary connection. Active sessions are maintained where the application protocol allows.

When the primary connection recovers and has been stable for a defined period, the failback script executes. Traffic returns to the primary connection. The process is automatic and requires no manual intervention.

Both connections are monitored continuously by IJA Verify — the Raspberry Pi at the customer's premises sending telemetry to Zabbix and surfacing the data in the customer's Grafana dashboard. Failover events are logged with timestamps, duration, and cause. The customer and IJA both see exactly what happened and when.

Starlink as a Secondary Connection

Starlink has become the secondary connection of choice for IJA's dual WAN deployments in Accra, for several reasons.

Speed. Starlink's download speeds in Ghana typically range from 50Mbps to 200Mbps — more than adequate for business failover use.

Latency. Starlink's low-earth orbit constellation delivers latency of 20–60ms — significantly better than traditional geostationary satellite internet and acceptable for VoIP and most business applications.

Independence. Starlink is completely independent of terrestrial infrastructure. A fibre cut, an exchange failure, or a last-mile outage that takes down a conventional ISP has no effect on Starlink.

Availability. Starlink equipment is available in Ghana and can be deployed quickly — typically within days of ordering.

The practical limitation of Starlink as a primary connection is that it can be affected by severe weather and has higher latency variability than a well-provisioned fibre connection. As a secondary failover connection, these limitations are acceptable — you need it to work when the primary fails, and it does.

What to Look for in a Dual WAN Implementation

Not all dual WAN implementations are equal. When evaluating a solution, ask:

Is the monitoring genuine? Some routers simply check whether the WAN interface has an IP address. This is not sufficient — a connection can have an IP address and be completely non-functional. Proper monitoring sends test traffic through the connection and verifies it reaches a known external endpoint.

What triggers failover? The failover threshold matters. A configuration that only fails over on complete link failure will leave you on a degraded primary connection for longer than necessary. A well-configured system should fail over when the primary connection degrades below a defined quality threshold — not just when it drops entirely.

Are active sessions maintained? Ask specifically about VoIP calls and VPN sessions. If the answer is that they will be interrupted, understand whether that is acceptable for your business.

Is there monitoring and reporting? After a failover event, you should be able to see exactly what happened: when the primary failed, when failover occurred, how long the secondary was in use, and when the primary recovered. This data is essential for understanding your connectivity risk profile and for holding providers accountable.

The Business Case

The cost of a dual WAN deployment — hardware, installation, and the ongoing cost of the secondary connection — needs to be weighed against the cost of downtime.

For a business with 20 staff, an hourly productivity cost of even $100 per hour means a 4-hour outage costs $400 in lost productivity alone — before accounting for missed sales, failed transactions, or reputational damage.

The Starlink subscription cost in Ghana is approximately $50–100 per month. The annualised cost of the secondary connection is $600–1,200 per year. One avoided outage of moderate length pays for it.

The calculation is straightforward. The question is not whether dual WAN is worth it — it is whether your business can afford not to have it.

IJA Technologies designs and deploys dual WAN failover solutions for businesses in Accra and across Ghana. Every deployment includes IJA Verify monitoring so you can see exactly what your connections are doing — and know the moment something changes. Talk to us about your connectivity.