Old Router Slowing NBN? How to Check
Yes, an old router can slow down faster NBN speeds, and you can check this by testing your connection while bypassing the router, comparing Wi-Fi vs. wired results, and reviewing your router’s maximum throughput and Wi-Fi standard. If your router was released more than five years ago, it likely lacks the hardware to handle NBN plans above 100 Mbps, especially over Wi-Fi.
How Routers Affect NBN Speeds
Your NBN connection brings data to your premises, but your router is the traffic manager that distributes it to your devices. Every router has a maximum throughput—the fastest rate it can process data—and this is often lower than the NBN plan speed. For example, a router with a 100 Mbps Ethernet WAN port cannot deliver a 250 Mbps NBN plan over a wired connection, and its Wi-Fi may cap out even lower. Additionally, older routers may use Wi-Fi standards like 802.11n (Wi-Fi 4), which in real-world conditions top out around 50-100 Mbps, far below what a 250 Mbps or 1000 Mbps plan can offer.
How to Check If Your Router Is the Bottleneck
- Run a speed test over Wi-Fi next to the router. Note the result.
- Connect a laptop directly to the router with an Ethernet cable and run the same speed test. If the wired speed is significantly higher, your Wi-Fi is the limiting factor.
- Bypass the router entirely: plug the NBN connection box (NTD) directly into your computer’s Ethernet port and run the speed test again. If this speed is much higher than the router’s wired speed, the router’s hardware is the bottleneck.
- Check your router’s specs: look up the model online for its WAN port speed (e.g., 100 Mbps or 1 Gbps) and Wi-Fi standard (e.g., 802.11ac, 802.11ax).
If the direct NBN connection gives you your plan’s speed but the router doesn’t, it’s time to upgrade.
Common Router Limitations That Slow NBN
- 100 Mbps Ethernet ports: Many older routers only have Fast Ethernet (100 Mbps) ports, which cap wired speeds at about 94 Mbps in practice.
- Old Wi-Fi standards: Wi-Fi 4 (802.11n) and early Wi-Fi 5 (802.11ac) routers often have slower real-world speeds, especially with multiple devices.
- Weak CPU and RAM: Routers with limited processing power struggle with high-speed connections, especially when using features like QoS or VPN.
- Outdated firmware: Old firmware may have bugs or lack optimizations for newer NBN technologies.
How to Choose a Router for Fast NBN
When selecting a router, prioritize these features:
- Gigabit Ethernet ports (1000 Mbps) on both WAN and LAN.
- Wi-Fi 6 (802.11ax) or at least Wi-Fi 5 with dual-band support.
- AC1200 or higher Wi-Fi rating (combined 2.4 GHz and 5 GHz speeds).
- Good CPU (dual-core or better) and at least 128 MB RAM.
For NBN plans up to 100 Mbps, a mid-range Wi-Fi 5 router will suffice. For 250 Mbps or faster, invest in a Wi-Fi 6 router to ensure your wireless devices can actually reach those speeds.
Wi-Fi vs. Wired: What to Expect
Even with a modern router, Wi-Fi speeds are typically lower than wired. For example, a Wi-Fi 5 router might deliver 200-400 Mbps in ideal conditions, while a Wi-Fi 6 router can reach 500-900 Mbps. However, walls, distance, and interference from neighbors can cut these numbers in half. If you need maximum speed, always use Ethernet for stationary devices like TVs and desktop computers.
Other Factors That Slow NBN (Not the Router)
Before blaming the router, consider these common issues:
- NBN technology type: FTTP (fibre) is fastest, but FTTN (fibre to the node) may max out at lower speeds depending on line distance.
- Peak-hour congestion: Your ISP may throttle speeds during busy times.
- Wi-Fi interference: Many neighboring networks on the same channel can slow you down.
- Device limitations: Your laptop or phone’s Wi-Fi card may be older than the router.
Run multiple speed tests at different times to distinguish between router issues and ISP congestion.
Frequently Asked Questions
How do I know if my router is too old for my NBN speed?
Check your router’s WAN port speed and Wi-Fi standard. If the WAN port is 100 Mbps and your plan is faster, the router caps wired speeds. If it uses 802.11n or early 802.11ac, Wi-Fi will likely be the limit. Also, if the router is more than 5 years old, it’s worth upgrading.
Can a router slow down NBN 1000?
Yes, many older routers cannot handle gigabit speeds. Their Ethernet ports may be limited to 100 Mbps, and their Wi-Fi may max out around 300 Mbps. Even some newer budget routers have slower CPUs that struggle with gigabit routing.
Will a new router always fix slow NBN?
No. If the slowdown is due to your NBN technology type (like FTTN with a long line) or ISP congestion, a new router won’t help. Test by connecting directly to the NBN connection box—if speeds are still low, the issue is outside your router.
What is a good Wi-Fi speed for NBN 100?
For a 100 Mbps NBN plan, aim for at least 80-90 Mbps over Wi-Fi. A decent Wi-Fi 5 router can achieve this in the same room. If you’re getting less than 50 Mbps, check for interference or upgrade to a Wi-Fi 6 router.
Should I upgrade my router or buy a mesh system?
If you have a large home or multiple dead zones, a mesh system (like a Wi-Fi 6 mesh) is better. If your home is small and you just need speed, a single high-performance router is more cost-effective.
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