Travid
A mobile app that tracks contacts and slows the spread of COVID-19 using a personal QR code for every citizen.
Tech Core
Technology, Infrastructure & Innovation
A personal space where I share my technology projects and what I learn in the field: infrastructure, networking, cybersecurity, and the systems that keep everything running.
What Tech Core covers
Nine areas, with networking and infrastructure at the center.
- Networking Routing, switching, DNS, firewalls, and troubleshooting. 1 article
- Infrastructure Servers, storage, virtualization, and data centers.
- Cybersecurity SOC work, vulnerability management, and Zero Trust. 1 article
- Cloud computing Azure, AWS, Google Cloud, and hybrid setups.
- Linux and Windows System administration, hardening, and monitoring. 1 article
- IT operations Monitoring, incidents, patching, and capacity.
- Automation Infrastructure as Code, scripting, and CI/CD.
- Artificial intelligence Practical AI in enterprise environments.
- Technology management Governance, ITSM, risk, and vendor management.
Featured projects
All projectsTwitter sentiment analysis
Analyzing how people feel about remote work through the #WorkFromHome and #العمل_عن_بعد hashtags.
Hope Finder
A web app for Spanish Fork City, Utah, that makes mental-health support and suicide-prevention resources easy to reach.
Recent insights
All insightsCheck DNS before blaming the network
Many "the network is slow" tickets come down to slow or failing DNS lookups. Here's a practical order for ruling DNS out in minutes.
Where Zero Trust actually starts
Zero Trust isn't a product you buy. It starts with three unglamorous pieces of groundwork most organizations already half-have.
When a Linux disk fills up: a calm checklist
A full disk takes services down in confusing ways. This is the order I check things in, including the deleted-but-open file trap.
Latest on X
All postsكثير من حالات «الشبكة بطيئة» يكون سببها زمن استجابة DNS وليس الرابط نفسه. قياس الاستعلام بـ dig قبل أي شيء يختصر وقت التشخيص كثيرًا.
Original post in Arabic
Translation — not part of the original post
Many "the network is slow" cases turn out to be DNS latency, not the link itself. Measuring the lookup with dig first cuts troubleshooting time a lot.
MTU mismatches rarely break everything. They break the big packets: pings pass, small pages load, and file transfers stall. That pattern alone is a strong hint.