By Morgan Lucas (she/her) - August 2025

Just like the Terraform post, the labs are located here.

Configuring Firewall Tables

Firewalls are rules that let connections through. By doing this, I’m a guardian for what is allowed to connect to our resources. We make these with iptables in Linux.

• I remotely enter a computer hosing our application and set up rules;

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sudo is is the Ultimate User in Linux systems.

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These particular rules

• allow a secure connection (SSH) (port 22)
• a standard HTTP connection (port 80)
• Disallows everyone not 172.16.238.187 from connecting

Linux Networking

I check interfaces with ip a, and the routing table as a whole with ip r

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I do that to check the gateway IP address - that’s how local network data goes places

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