It’s also important to protect your network from attacks over the internet by keeping your router secure. Your router directs traffic between your local network and the internet. So, it’s your first line of defense for guarding against such attacks. If you don't take steps to secure your router, strangers could gain access to sensitive personal or financial information on your device. Strangers also could seize control of your router, to direct you to fraudulent websites.
Change the name of your router from the default. The name of your router (often called the service set identifier or SSID) is likely to be a standard, default ID assigned by the manufacturer. Change the name to something unique that only you know.
Change your router's pre-set password(s). The manufacturer of your wireless router probably assigned it a standard default password that allows you to set up and operate the router, as its “administrator.” Hackers know these default passwords, so change it to something only you know. The same goes for any default “user” passwords. Use long and complex passwords – think at least 12 characters, with a mix of numbers, symbols, and upper and lower case letters. Visit the company’s website to learn how to change the password.
Turn off any “Remote Management” features. Some routers offer an option to allow remote access to your router’s controls, such as to enable the manufacturer to provide technical support. Never leave this feature enabled. Hackers can use them to get into your home network.
Log out as Administrator: Once you’ve set up your router, log out as administrator, to lessen the risk that someone can piggyback on your session to gain control of your device.
Keep your router up-to-date: To be secure and effective, the software that comes with your router needs occasional updates. Before you set up a new router and periodically thereafter, visit the manufacturer’s website to see if there’s a new version of the software available for download. To make sure you hear about the latest version, register your router with the manufacturer and sign up to get updates.
And when you secure your router, don’t forget to secure your computer too. Use the same basic computer security practices that you would for any computer connected to the internet. For example, use protections like antivirus, antispyware, and a firewall -- and keep these protections up-to-date.
Note: The FTC says securing you router is your first line of defense. We at SnowPaw Solutions believe having a properly configured and managed firewall is actually your first line of defense. We also don't believe in paid computer based antivirus and firewalls, you need a network wide solutions, not just on some end points. Contact us to learn more on the topic.
Source: https://www.consumer.ftc.gov/articles/0013-securing-your-wireless-network