Scott's Weblog

AUGUST 16, 2024

Geoff Huston discusses DNS and UDP truncation. ” Also via The Hacker News, I saw this article about Singapore banks phasing out OTPs (one-time passwords). Virtualization Stine Elise Larsen writes about an easily-missed requirement for port 9087 to be open between vCenter Server and ESXi hosts when using vSphere Lifecycle Manager.

DNS 40

DNS Server Engineering Cloud 40

Kentik

JULY 28, 2021

Or standing in line at the bank or a department store and when the clerk says, “The system is really slow today.” Bad hardware (the switch or router port). Latency : Missing packets in connection-oriented protocols such as TCP and QUIC result in lost packets getting resent. These packet retransmits introduce latency.

Cloud 116

Cloud TCP Routers Protocol 116

CloudFaire

JANUARY 21, 2025

HTTPS in legitimate traffic and DDoS attacks: 2024 Q4 Layer 3/Layer 4 DDoS attacks The top three most common Layer 3/Layer 4 (network layer) attack vectors were SYN flood (38%), DNS flood attacks (16%), and UDP floods (14%). We also saw a similar number of unique source ports per second.

IP Address 121

IP Address Network Networking Server 121