Networking

firewalld and Network Namespaces Intro

Name: firewalld and Network Namespaces Intro
Price: 560000 KRW

Draw zones that match reality, test rules safely, and peek into namespaces without losing your place.

Live online 3 weeks · 16 lab hours Associate

560,000 KRW informational until enrollment confirms

Diagram drawn on glass with subnet circles

Program narrative

Labs progress from single-host rules to tiny namespace topologies that mimic split-horizon DNS mistakes. You keep a paper diagram beside every change—old school on purpose.

What the labs include

Rich rules vs simple service openings
panic mode rehearsal with rollback
Namespace veth creation with ping proofs
nftables translation overview
Packet capture etiquette for classrooms
Change window script skeleton
Peer review of diagram accuracy

Outcomes you can show a lead

Draft a zone layout stakeholders can sign
Prove a rule with capture before declaring victory
Recover from panic mode without reinstall fantasies

Straight FAQ

IPv6?

We touch IPv6 rules conceptually; labs stay IPv4 for stability.

Cloud security groups?

Mapped in discussion, not configured in cloud accounts.

Limitations?

Hardware offload NIC quirks are out of scope.

Recent participant notes

“Namespace ping proof finally made split DNS click. Diagrams took longer than commands—in a helpful way.”

Seulgi · Education nonprofit · Trustpilot