6 min readTutorial
A guest Wi-Fi setup that won’t expose the office
Build guest Wi-Fi as an internet-only security zone, with real firewall isolation, sensible access, and tests that catch leaks into business networks.
Networking
7 articles
5 min read
Choosing a business ISP failover plan
How to choose a genuinely independent backup circuit, size it for essential work, and test automatic failover before the primary ISP goes dark.
3 min readTutorial
A one-page network diagram that stays true
How to build a single network map your team will actually update after every change, not a shelf document from the last migration.
3 min readTutorial
Document firewall changes on one page
A single change record template so every rule edit has a name, a reason, and a rollback path.
5 min read
When to replace that aging firewall
Replace a firewall based on support, measured capacity, security requirements, and recoverability—not a birthday or a frightening sales chart.
6 min readTutorial
DNS and email authentication: SPF, DKIM, and DMARC
A practical rollout for authorizing every legitimate sender, signing mail, enforcing DMARC, and catching gaps before messages get rejected.
3 min read
Is DNS filtering worth it for SMBs?
When blocking bad domains at the resolver beats buying another appliance—and when it is not enough on its own.