This page will help you configure the firewall located at your gateway router in order to restrict traffic coming into your network. Below is a tool that is very similar to what you played with as part of the Firewalls discussion. Design your ACL (Access Control List) rules with it, then click on the Generate Firewall Config File button to create configuration commands in the proper format for inputting into your gateway router. This done, you should login to your gateway router via ssh and copy&paste the generated configuration commands into that ssh shell. Note: Remember that when a firewall receives a packet, it checks the ACL rules from top to bottom, applying the first rule it finds that matches the packet, and ignoring the remaining rules.
Click the "Generate Firewall Config File" button to generate commands, then ssh into your gateway router and copy and paste the entirety of the generated output into the ssh shell.
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