Install
DNS, Routing & BGP
Resolvers, DNSSEC, anycast, BGP hijacks/leaks, and routing security (RPKI).
- 4 Tracked terms
- Last 30 days Feed window
What this topic collects on
An article joins this feed when it matches these terms. Each one is also a search of its own.
Related topics
Latest in DNS, Routing & BGP
What Happens When DNS Breaks: Inside the Internet's Most Critical Vulnerability
4+ hour, 34+ min ago (1248+ words) The Domain Name System is one of the most invisible technologies that powers almost every online... Tagged with frontend, catcham, webdev, programming....
DNS Traffic Management: How DNS Keeps Websites Reachable When Failures Occur
6+ hour, 31+ min ago (247+ words) At its core, the Domain Name System is a hierarchical distributed database translating human-readable domain names into machine-routable IP addresses. However, treating DNS as a static lookup table ignores its modern role as an active routing and availability engine. Caching…...
Your DMARC record might contain something that no longer exists
19+ hour, 49+ min ago (1037+ words) Most of us set up SPF, DKIM and DMARC once, watch the reports for a week or two, and then leave them alone. That's usually the right call. They aren't systems that need constant attention. This year is worth an…...
Your bounce handler is probably suppressing the wrong address
21+ hour, 47+ min ago (483+ words) Here is a bug I have now seen in four separate codebases, including one I wrote. Mail goes out. A bounce comes back. The handler parses the status code, sees a 5.x.x, concludes the address is bad, and adds the…...
I sent 50 emails. 12 bounced despite SMTP 250 OK.
1+ day, 35+ min ago (1795+ words) On March 14, my campaign hit a wall. I sent 50 cold outreach emails to hand-collected leads. Every single address had returned 250 OK during SMTP verification. Twelve of them bounced anyway. That's a 24% bounce rate from addresses that were supposed to be…...
I Sent 50 Emails And Got 12 Bounces. SMTP 250 Failed Me.
1+ day, 2+ hour ago (1434+ words) On July 15 I queued a campaign to fifty addresses I had already "verified" with a plain SMTP handshake. Every single one returned 250 OK. Three hours later, twelve of them bounced. That's a 24% failure rate in 38 minutes on addresses that looked…...
I sent 50 emails. 12 bounced despite SMTP 250 OK. Here's why.
1+ day, 3+ hour ago (1356+ words) On July 15 I queued a campaign to fifty addresses I had already "verified" with a plain SMTP handshake. Every single one returned 250 OK. Three hours later, twelve of them bounced. That's a 24% failure rate on addresses that looked perfectly healthy…...
DNS change monitoring: the seven false alarms I had to kill
1+ day, 3+ hour ago (630+ words) The first version of any DNS checker is about ten lines. Look up a record, compare it with the value stored last time, send an email if they differ. Point that at a real domain for a day or two…...
The Anatomy of an IP Ban: TCP Fingerprints, Passive OS Fingerprinting, and MTU Signatures
1+ day, 11+ hour ago (944+ words) The security posture of web-scale infrastructure historically relied on IP-based rate limiting and reputation blocklists operating at Layer 3 (L3) and Layer 4 (L4) of the OSI model. When request volumes exceeded threshold allocations, edge firewalls appended source IPv4 addresses to dynamic access control lists…...
20m radio mast given go-ahead despite residents' objections
1+ day, 19+ hour ago (292+ words) Kieran Molloy, Local Democracy Reporter A 20m-tall telecommunications mast has been given the go-ahead despite objections that it will be an “overbearing visual intrusion” on nearby homes. Cardiff Council planners have decided Cornerstone Telecommunications Infrastructure Limited does not require prior…...