Can Your Network Spot an Intruder? SMB Threat Detection

The question nobody asks until it's too late

Most Australian small businesses have a firewall. Tick. But here's the uncomfortable question: can it actually notice when something goes wrong?

Not just block the obvious stuff at the front door — but spot a laptop quietly beaconing out to a dodgy server in another country, a strange traffic spike at 3am when the office is empty, or a machine that's already been compromised and is now talking to things it shouldn't.

A firewall that simply allows or denies traffic is a locked door. Threat detection is the smoke alarm. You want both. The good news is that decent detection is now well within reach for SMB budgets — you just need to understand what you're actually buying.

Two kinds of detection (this is the bit that matters)

Nearly every product in this space does one or both of these. Knowing the difference is half the battle.

1. Signature-based IDS/IPS

This matches network traffic against databases of known bad patterns — malware, exploits, command-and-control chatter. The two big engines you'll hear about are Snort (Cisco/Meraki) and Suricata (Ubiquiti and the open-source world).

• An IDS (Intrusion Detection System) detects and alerts.
• An IPS (Intrusion Prevention System) also blocks.

Most affordable gear does this. It's effective against threats someone has already catalogued — but it can miss something brand new.

2. Behaviour / anomaly detection

This flags unusual activity even when there's no known signature: a brand-new unknown device appearing on the network, a workstation suddenly chatting to a strange country, an odd traffic pattern that doesn't fit the norm. Fewer affordable boxes do this well, which is exactly why it's worth asking about.

In practice, most SMB "detection" is the firewall doing signature IDS/IPS with a few anomaly features layered on top. That's perfectly reasonable — just know what's under the bonnet.

The realistic options, low-to-medium price

Cisco Meraki MX — managed and cloud-alerted

This is where we'd point most SMBs first, and not just because we're a Meraki shop.

Meraki MX threat protection runs the Snort 3 IDS/IPS engine, with rules curated by Cisco's Talos threat-intelligence team and pushed automatically from the cloud — so you're not manually updating rule sets. It also includes AMP (Advanced Malware Protection), which inspects file downloads for nasties.

Notably, Snort 3 now applies zero-trust inspection to internal east-west traffic — the traffic moving between devices inside your office — not just internet-bound traffic. That's a genuine step up for catching lateral movement.

The real SMB advantage: detections surface in the same cloud dashboard you already use to manage everything. Alerts that show up where you're already looking are alerts that actually get seen. It needs the Advanced Security licence, so think hardware plus subscription — medium price overall.

Good fits from our catalogue:

• Meraki MX67 (MX67-HW) — ideal for a small office or branch.
• Meraki MX68 (MX68-HW) — a step up with extra ports.
• Meraki MX75 (MX75-HW) — for busier sites needing more throughput.

Ubiquiti UniFi — licence-free baseline

UniFi gateways include Suricata IDS/IPS built in with no base licence, can do protocol anomaly detection, and send email/push alerts. An optional paid CyberSecure subscription greatly expands the signature database.

Low up-front cost and a licence-free starting point are real attractions. The honest catch: turning IPS on reduces the gateway's throughput because of the deep inspection, and you self-manage it — there's no one watching the dashboard for you.

Firewalla (Purple or Gold) — the cheap anomaly story

Firewalla is a one-off purchase with no monthly fee that pairs IPS with cloud behaviour analytics. It actively watches for abnormal trends and suspicious connections 24/7 and pings you when a new device joins the network. For low-cost anomaly detection, it's the strongest option here.

It's aimed at SOHO and small business, managed from a tidy phone app — not an enterprise-class managed platform — but for a micro-business that wants behaviour alerts on a budget, it's clever.

Fortinet FortiGate (40F / 60F) — capable next-gen firewall

A proper next-gen firewall with FortiGuard IPS, antivirus and web filtering on subscription. Plenty capable. Just remember the homework: keep it patched and rotate credentials — see our FortiBleed post on why that matters.

TP-Link Omada — budget basics

Budget gateways with basic IPS/DPI and no recurring licence. Fine entry-level coverage if money is genuinely tight and expectations are set accordingly.

Open-source / DIY — lowest licence cost, highest skill cost

Suricata or Snort on pfSense or OPNsense, or Security Onion / Zeek for true network-detection-and-response. Free software on commodity hardware. The licence cost is roughly zero; the skill cost is high. Great for a technical owner or an MSP — not so much for a business with no IT person.

Honourable mention: deception / honeypots

Tools like the commercial Thinkst Canary or open-source OpenCanary plant a decoy and alert the moment an intruder touches it. Very low noise, very high signal — a lovely complement to IDS, not a replacement for it.

The honest caveats every buyer should know

The performance tax. Turning on IPS deep-inspects every packet, which reduces throughput. On a typical ~50 Mbps NBN link this is a non-issue. On fast fibre, it matters — pick hardware sized for your speed. (See our router speed and right-sizing post.)

North-south vs east-west. A firewall mainly sees traffic crossing the internet boundary (north-south). Lateral movement inside your office LAN (east-west) can slip past unless the platform inspects it. Meraki's Snort 3 does; many cheaper boxes don't.

Detection is not response. This is the big one. An IDS only alerts; an IPS only blocks. Someone still has to see and act on the alerts. For a business with no IT staff, a managed, cloud-alerting platform that surfaces issues clearly beats a powerful tool that nobody is watching. A silent dashboard helps no one.

Where the market is heading

Standalone IDS/IPS boxes are increasingly being built into next-gen firewalls and broader security platforms. So the practical SMB question is no longer "which separate IDS appliance do I buy?" — it's "which firewall I already need has good detection built in?"

That reframing saves money and clutter. You were buying a firewall anyway; choose one that watches as well as guards.

So what should you actually do?

For most Australian SMBs, the smartest move is the firewall you already need, with detection built in and actually monitored:

• Meraki MX — if you want managed, cloud-alerted detection that surfaces in a dashboard you already check.
• UniFi — if you want a licence-free baseline and are happy to self-manage.
• Firewalla — the cheapest anomaly-focused option for very small setups.

Whatever you pick, the goal is the same: detection someone is genuinely watching — not a clever appliance blinking away in a comms cupboard that no one ever opens.

For the bigger picture, have a read of our post on the biggest network security risks for Australian SMBs.

References

• Cisco Meraki — Threat Protection (IDS/IPS and AMP)
• Ubiquiti UniFi — Intrusion Detection and Prevention (IDS/IPS)
• Firewalla — Cyber Security

Talk to TYO Store

We can set up threat detection that's actually monitored — not just installed and forgotten — and supply the right gear for your business, whether that's a Cisco Meraki MX or a product from another manufacturer. Tell us your internet speed, site size and budget, and we'll right-size a solution that notices when something's wrong. Get in touch with TYO Store and let's make your network smarter about intruders.