Network

Somewhere between Gaithersburg and College Park there's a strand of ordinary telecom fiber hanging off utility poles, doing what fiber on poles does: swaying in wind, stretching in the afternoon...

So NVIDIA put a 102.4-terabit-per-second Ethernet switch on stage on July 21, and the number is doing a lot of heavy lifting. Here's the short answer: Spectrum-6 roughly doubles the...

You push a DNS change, then sit there wondering if it actually took. Don't wonder, ask: nslookup example.com works on any OS, Windows included, and confirms a name resolves or...

Someone on the phone asks for your IP, and you blank on which command your OS wants. Windows takes ipconfig; Linux wants ip addr, or just ip a if you're...

The new server is up, the IP is sitting in your clipboard, and the OVH panel is doing its best to hide the one tab you need. It's the DNS...

You fixed the DNS record, and your Linux box keeps serving the old IP anyway. On modern Ubuntu, Debian and Fedora the fix is sudo resolvectl flush-caches, because systemd-resolved is...

A site moved servers yesterday and your PC keeps loading the old one. That's the Windows DNS cache holding a stale answer, and one command clears it: open Command Prompt...

Someone asks for the WiFi password and you realize you typed it once, two years ago, and it's gone from your head. Your PC hasn't forgotten: one netsh command prints...

A ticket lands asking for a /24 for the new floor, and everyone in the thread nods like that obviously means something. Here's what it means: a /24 is a...

You changed the record an hour ago, and half the office still lands on the old server. That's DNS TTL: the number of seconds a resolver may cache a DNS...