KKatia Belokon3h ago · 6 min readMy IP Blacklist Checker Showed a Dead Botnet Server as "Listed"TL;DR My IP blacklist checker showed a red Listed for an Emotet C2 address that Feodo Tracker marks offline. Presence in a threat feed is not the same as "listed now". The feed's own status field saikatiabelokon.hashnode.dev
IInstaTunnel11h ago · 13 min readCertificate Transparency Leaks: Why Your "Secret" Tunnel URL Isn't SecretYou run one command, your localhost gets a public HTTPS address like https://k7x2m9qa.example-tunnel.dev, and you paste it into a client chat. The label looks random, nobody has it, so it feels privatinstatunnel.hashnode.dev
VVISHAL M22h ago · 16 min readDecoding TCP and UDP Headers, One Bit at a TimeOpen your laptop right now and count what is talking to the internet. A browser with six tabs, WhatsApp Web, Spotify, maybe a game launcher updating in the background. All of these share one Wi-Fi conwhatisdatalinklayerswitching.hashnode.dev
FFarrukh Tariq19h ago · 7 min readDoes DNS over HTTPS Cause VPN Leaks? How to Check Your Browser’s DNS PathYour VPN is connected. An IP check shows the expected VPN address. Then a DNS test reports a resolver you do not recognise. You enable DNS over HTTPS in your browser, repeat the test and get another rklarvpn.hashnode.dev
MMahammadasrar Ghanchi1d ago · 6 min readData Center Basics: A Beginner's GuideWhat is a data center? A data center is a big, secure building full of computers. These computers run all day and all night, so your apps and websites never go to sleep. Think about your last hour onlmahammadasrar.hashnode.dev
WWeiwei Zhang1d ago · 5 min readInside InfiniBand HDR, NDR, and XDR: Bandwidth, SerDes, and AI Fabric ScalingModern AI clusters rely on more than GPU compute performance. Their efficiency also depends on how quickly and reliably thousands of compute resources can exchange data. InfiniBand has become an imporaicplight.hashnode.dev
Ddafili1d ago · 12 min readWhy your cloud monitoring is blind to IPv6 blackholes (and how to fix it)Also published on Dev.to — that version has the discussion. TL;DR: your checker probably takes the first address the resolver hands back, and on a dual-stack host that is the AAAA record. If IPv6 ismediaforge-studio.hashnode.dev
IInstaTunnel1d ago · 14 min readSigned, Sealed, Mangled: Why Webhook Signatures Fail Behind a TunnelYou point a tunnel at localhost:3000, send a test event, and your handler answers 400 Invalid signature. The payload looks right. The secret looks right. So why does webhook signature verification faiinstatunnel.hashnode.dev
Rroy1d ago · 8 min readHow to Diagnose SFP+ Link Failures on Linux ServersAn SFP+ connection can fail even when the network adapter, transceiver, and fibre cable appear correctly installed. Linux may report the interface as down, the link may disconnect repeatedly, or a 10Gormsystem.hashnode.dev
VVMHeaven1d ago · 6 min readStatic IP address: what it is, and how to set one on Linux and WindowsFirst published on the VMHeaven blog: Static IP address: what it is, and how to set one on Linux and Windows Short answer: a static IP address is one that stays the same every time a device connects vmheaven.hashnode.dev
