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DNS, Routing & BGP
Resolvers, DNSSEC, anycast, BGP hijacks/leaks, and routing security (RPKI).
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Checking your browser before redirecting.
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DNS Troubleshooting
10+ hour, 51+ min ago (108+ words) The system admins team of xFusionCorp Industries has noticed intermittent issues with DNS resolution in several apps. App Server 2 in Stratos Datacenter is having some DNS resolution issues, so we want to add some additional DNS nameservers on this server....
The hostname you visit over HTTPS is sent in plain text
11+ hour, 58+ min ago (638+ words) So I captured the first thing my machine sends when it opens an HTTPS connection, the TLS ClientHello, and went looking for the hostname in the bytes. It was not hard to find. Here is the ClientHello openssl sent when…...
4 Failure Modes of TXT Record Domain Ownership Verification in FastAPI Onboarding
13+ hour, 33+ min ago (419+ words) Four failure modes account for most of the damage, and none of them are exotic. Every standard that had to solve this landed in the same place. DMARC publishes policy in a TXT record at _dmarc under the domain precisely because…...
E-Commerce DNS Zones: Enumerate, Diff, Apply, and Verify in Node.js
14+ hour, 45+ min ago (613+ words) Short answer: list the live DNS records, save that original snapshot, diff it against the intended set, upsert only the differences, and verify the important outcomes before changing nameservers. For an e-commerce platform moving away from a registrar-specific Node.js…...
Mail Going to Spam After Setup in 2026: Debug SPF, DKIM, DMARC Alignment
15+ hour, 51+ min ago (504+ words) Short answer: inspect one received message and find which authenticated domain aligns with the visible From domain; DMARC passes when an aligned SPF result or an aligned DKIM result passes, but that pass does not guarantee inbox placement. For a…...
Project Jake: A New Model for Domain Registration Data Disclosure
1+ day, 1+ hour ago (888+ words) The author would like to thank the members of the Jake Community who helped in the creation of this article: Scott Bradner, Steve Crocker, Kenny Huang, Hsu-Ping, Suncica Rosic, Jo-Fan Yu. Last week, Kenny Huang in his CircleID article: “Beyond…...
Can You Explain DNS and SSL Clearly? Most Developers Can’t
1+ day, 13+ hour ago (34+ words) Ask a developer: “Can you explain DNS and SSL?” You might hear answers like: DNS is for domain names. SSL makes websites secure. These …...
How the Web Works: A Journey from URL to Screen
1+ day, 17+ hour ago (411+ words) Before going further, it helps to separate two terms people often use interchangeably. The internet also carries other services like email, file transfer, video calls but the web is by far the most visible one to everyday users. Everything begins…...
Why DNS Had to Exist: The Directory Problem Explained From First Principles
1+ day, 23+ hour ago (921+ words) Software Laws from First Principles — Investigation 009. This picks up directly from Identity ≠ Location — read that first if you haven't. A person moves to a new home while a neighborhood directory keeps track of their current location. The moment identities stay…...