In this article I’ll try to make some performance evaluation of Patricia tree for purpose of IP address lookup in list of prefixes in C and C++ languages. Briefly, Patricia tree can help us to confirm that IP address 10.0.0.1 belongs or not to list of

In this blog post I'll cover pretty curious behaviour of IPFIX protocol on Juniper MX 204 boxes with JunOS 18.2R3-S6.5. This protocol is industry standard for exporting traffic observed by carrier grade routers or switches. NB! After followup investigation it was confirmed that issue was caused

To prove point that IPv6 is ready for production use I've been using IPv6 only setup on my Ubuntu PC for more then 4 months. To access legacy IPv4 Internet I use NAT64 gateway based on Tayga deployed on RockPro64 SBC in my cupboard: Most of the apps

At FastNetMon we work with UDP based protocols such us Netflow, IPFIX and sFlow on daily basis. These protocols are used by great variety of network equipment vendors to send information about traffic observed by network device to monitoring software. Today our technical support team received report from customer about

For my work PC with Ubuntu Linux 22.04 LTS I use only IPv6 with my own NAT64 gateway which I run on RockPro64  to access resources without support for IPv6. Today I spent morning to enable native IPv6 for Google Cloud account we use for testing. Sadly I faced

Intro Hey! I'm Pavel from London, I'm CTO of FastNetMon and we run DDoS attack detection with on premise installations in 146 countries. This post was inspired by GitHub conversation which was triggered by Clickhouse's team decision to start asking for CPU feature called

In this blog I'll cover topic about random opcode. This opcode is extremely useful as it allows us to randomise behaviour of typically pretty deterministic BPF programs.  I'll try to find out which kernel version included this new opcode. You may be familiar with great technology

To keep excellent customer experience with FastNetMon we use Sentry to report any failures from our installation tools implemented in Go. Today we received following anonymised report about FastNetMon Community installation failure: It was pretty clear that it caused by missing configuration policy flags for dpkg in our installer logic

Since start of FastNetMon project in 2013 Ubuntu LTS was our distribution of choice. It has all must have points for production deployments: - Very long and predictable support cycle - It offers fresh versions of kernels to address hardware support - Backed by open and transparent community of Debian