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Get my free Dashboard →Enable your router's built-in firewall
Most routers include a built-in firewall that filters incoming traffic. Check that it is switched on.
Why this matters
A router firewall is your first line of defence. It blocks unsolicited connection attempts from reaching your devices.
How to do it
- Log in to your router admin panel
- Look for a 'Firewall', 'Security', or 'Advanced' section
- Confirm the firewall is enabled — it usually is by default
- Save settings if you made a change
Need a more detailed walkthrough?
Our step-by-step guide explains each action in full detail, with confirmation steps and related tasks.
View full step-by-step guide →Cyber Essentials framework
This task falls under the Firewallscontrol, one of five areas assessed in the UK's Cyber Essentials scheme. Completing it counts toward your Cyber Essentials alignment. Create a free account to track your progress across all five areas.
Frequently asked questions
What does a router firewall actually do?
Your router firewall acts as a barrier between your home network and the internet. It blocks unsolicited connection attempts from reaching your devices, so if someone online tries to connect directly to your computer or smart device, the firewall stops them before they get through.
Is the router firewall already on by default?
Usually, yes. Most routers have the firewall enabled by default. However, it is worth logging into your router's admin page to confirm, as settings can sometimes be changed by previous users or by a broadband provider's engineer.
Do I still need antivirus software if I have a router firewall?
Yes. A router firewall and antivirus software serve different purposes. The firewall blocks unwanted inbound connections from the internet. Antivirus protects against threats that reach your device through normal browsing, email, or downloads. You need both.
Will enabling the firewall slow down my internet connection?
No. For home users, a router firewall has no measurable effect on broadband speed. The performance overhead of a basic firewall on modern router hardware is negligible.
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