This quick tutorial provides steps to use the netstat, nmap and lsof command to check the ports in use and view the application that is utilizing the port.
Source: How to check if port is in use on Linux or Unix – nixCraft
Category Archives: Networking
Increase Linux Internet speed with TCP BBR congestion control
I recently read that TCP BBR has significantly increased throughput and reduced latency for connections on Google’s internal backbone networks and google.com and YouTube Web servers throughput by 4 percent on average globally – and by more than 14 percent in some countries. The TCP BBR patch needs to be applied to the Linux kernel.
Source: Increase Linux Internet speed with TCP BBR congestion control – nixCraft
Researcher uses 379-year-old algorithm to crack crypto keys found in the wild
Fermat’s algorithm was based on the fact that any odd number can be expressed as the difference between two squares. When the factors are near the root of the number, they can be calculated easily and quickly. The method isn’t feasible when factors are truly random and hence far apart.
Source: Researcher uses 379-year-old algorithm to crack crypto keys found in the wild | Ars Technica
Increase Linux Internet speed with TCP BBR congestion control
BBR is, in my opinion, one of the most critical improvements to Linux networking stacks in recent years. This page demonstrated how to enable and set up BBR on Linux based system.
Source: Increase Linux Internet speed with TCP BBR congestion control – nixCraft
Save .ORG
A registry could abuse these powers to do significant harm to the global NGO sector, intentionally or not. We cannot afford to put them into the hands of a private equity firm that has not earned the trust of the NGO community. .ORG must be managed by a leader that puts the needs of NGOs over profits.
Source: Save .ORG | SaveDotOrg.org
How DARPA Trucked Its Massive Radio Frequency Testbed Across The United States
Colosseum may look like a data center, but in reality, it’s a massive radio-frequency emulation testbed that DARPA built for its Spectrum Collaboration Challenge (SC2). SC2 has been a three-year competition to demonstrate the validity of using artificial intelligences to work together in order to use wireless spectrum more efficiently than operating on pre-allocated bands would be.
Why big ISPs aren’t happy about Google’s plans for encrypted DNS
Widespread adoption of DoH would limit ISPs’ ability to both monitor and modify customer queries. It wouldn’t necessarily eliminate this ability, since ISPs could still use these techniques for customers who use the ISP’s own DNS servers. But if customers switched to third-party DNS servers—either from Google or one of its various competitors—then ISPs would no longer have an easy way to tell which sites customers were accessing.
Source: Why big ISPs aren’t happy about Google’s plans for encrypted DNS | Ars Technica
How malformed packets caused CenturyLink’s 37-hour, nationwide outage
The switching module sent these malformed packets “as network management instructions to a line module,” and the packets “were delivered to all connected nodes,” the FCC said. Each node that received the packet then “retransmitted the packet to all its connected nodes.”
Source: How malformed packets caused CenturyLink’s 37-hour, nationwide outage | Ars Technica
But the outage continued because “the malformed packets continued to replicate and transit the network, generating more packets as they echoed from node to node,” the FCC wrote. Just after midnight, at least 20 hours after the problem began, CenturyLink engineers “began instructing nodes to no longer acknowledge the malformed packets.” They also “disabled the proprietary management channel, preventing it from further transmitting the malformed packets.”
A DIY Internet Network Has Drastically Expanded Its Coverage in NYC
Initially, the mesh network was powered by a single “Supernode” antenna and hardware array located at 375 Pearl Street in Manhattan. This gigabit fiber-fed antenna connects 300 buildings, where members have mounted routers on a rooftop or near a window. These local “nodes” in turn connect to an internet exchange point—without the need for a traditional ISP.
Source: A DIY Internet Network Has Drastically Expanded Its Coverage in NYC – VICE
New Silex malware is bricking IoT devices, has scary plans
This also means Silex will trash Linux servers if they have Telnet ports open and if they’re secured with poor or widely-used credentials.
Source: New Silex malware is bricking IoT devices, has scary plans | ZDNet
Ruh roh!