All posts by: Jason Ellison

network address space


Network address space is sometimes anounced by people who do not own that space. The insecure nature of the BGP routing protocol allows for this. IANA has a list of the ipv4 network allocation and to whom it belongs http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml Here is an oldie but a goody… Stealing The Internet – A Routed, Wide-area, Man […]

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nfl database


I made a website for a friend to automate his weekly nfl calculations. These numbers do not mean very much to me… However, he says it saves him several hours a week. https://nfl.jasonellison.net/

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Monitoring database performance with PRTG


PRTG is a fairly robust monitoring platform with good API support. It is lacking for out of the box performance monitoring of you databases. Sure it can tell you how long it took to respond to a simple SQL query, but to actually collect performance metrics… you have to do some leg work and create […]

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WebRTC: ubiquitous in browser voice and video communications


After a particularly bad voice conference, I thought to myself, “Why is this so difficult? We have the the technology to do this…” So I spun up the Debian VM. Installed FreeSWITCH, installed a WebRTC softphone demo (https://freeswitch.org/fisheye/browse/freeswitch/html5/verto/demo). Pointed a WebRTC compliant web browser at it… done. Now two people can point their web browser […]

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Providing visibility into windows event logs


If you have to support a few windows boxes, getting the windows event logs sent to a central location allows for monitoring and alerting. It can provide a lot of insight into the often dark world of windows. https://nxlog.co/products/nxlog-community-edition C:\Program Files (x86)\nxlog\conf\nxlog.conf Combine with graylog… voilà!

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FreePBX update forced reboot


While investigating a recent unexpected FreePBX reboot, I discovered the update script published by FreePBX actually called the reboot. After notifying the developers this reboot command was removed. https://upgrades.freepbxdistro.org/stable/10.13.66/upgrade-10.13.66-17.sh fun times 🙂

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Favorite talks


A list of my favorite talks An interesting talk concerning concurrency and processor design. this list shall grow …

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github merge accepted to librenms


I recently implemented LibreNMS to monitor network infrastructure, hosts, and application performance. This system augmented an existing system that is used for alerting. During the implementation I notice that a core piece, and important piece to me, was not function. After investigation and discussion with the community and input from others, I rolled up my […]

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Information Assurance by NSA


iadgov github repository came up in a meeting today. GRASSMARLIN is used in the ICS/SCADA sector for passive identification of critical infrastructure. New toys… Information Assurance by NSA The official GitHub organization account for the Information Assurance mission at NSA. https://github.com/iadgov Also see: GRASSMARLIN, an open-source tool for passive ICS network mapping

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Nmap OS database submissions


Date: Fri, 18 Dec 2009 17:06:30 -0800 (PST) To: Jason Ellison From: David Fifield Cc: Fyodor Subject: Nmap OS database submissions Jason Ellison: I’m David Fifield, the one who handles Nmap OS submissions. I recently finished integrating submissions from between May and November 2009. I want to thank you because during that period you were […]

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