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A Tale of How Not to Turn Your Cisco Router into a Public DNS and NTP Server by Accident

Level of difficultyEasy
Reading time6 min
Views729

The Cisco IOS/IOS-XE operating system is a source of inspiration for many other vendors. The internet is full of guides on how to configure a typical Cisco router for SOHO scenarios. However, unlike consumer-grade routers, configuring something like Cisco IOS requires caution. If you don’t think things through, the router may start "living its own life" and end up, for instance, as a DDoS amplification tool.

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Linux Switchdev the Mellanox way

Reading time7 min
Views3K
This is a transcription of a talk that was presented at CSNOG 2020 — video is at the end of the page



Greetings! My name is Alexander Zubkov. I work at Qrator Labs, where we protect our customers against DDoS attacks and provide BGP analytics.

We started using Mellanox switches around 2 or 3 years ago. At the time we got acquainted with Switchdev in Linux and today I want to share with you our experience.

Datacenter TCP explained

Reading time2 min
Views4.2K
Modern networking contains a number of improvements over the basic TCP/IP stack. One of this, particularly useful inside datacenter was developed by Microsoft Research in 2010 and called, surprisingly, DataCenter TCP (DCTCP).

DCTCP is a set of modification to TCP, targeting to fulfill two properties:
1. Improve latency for latency-sensitive small messages
2. Not to decrease the throughput for throughput-sensitive big flows
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