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- Postfix Operational tips
- Live stream to YouTube from a Raspberry Pi + webcam
- How to add private root CAs in SLES or Redhat
- Fishcam using Raspberry Pi and some network tricks
- The IT Detective agency: Live hack caught, partially stopped
- Evaluation of WPI’s multiple camera coprocessor using Raspberry Pi
- Google Hangouts Meet – what do these IPs all have in common?
- Consumer Tech: amazing little Bluetooth adapter for your car
- Great serial port concentrator: Raritan Dominion
- Counting active leases on an old ISC DHCP server
- The IT Detective Agency: Cisco Jabber Carriage Return problem fixed
- Latest spear phishing: your password plus extortion
- Voice and data vlans on one switch port, no vlan tagging: how does that work?
- Solution to this week’s NPR puzzle using simple Linux commands, again
- The IT detective agency: rogue IPv6 device messes up DHCP for entire subnet
- Where is my IP without the aggressive ads
- What credit card fraud looks like
- NJ homeowners: how to sell your SRECs from your solar panels
- Linux tip: how to enable remote syslog on SLES
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Author Archives: john
Postfix Operational tips
Intro I’m trying out the system-supplied postfix on a SLES system. i had been using sendmail but there doesn’t seem to be any development on that software. Some commands I needed right away Well, right away I had thousands of … Continue reading
Live stream to YouTube from a Raspberry Pi + webcam
Intro I’ve been looking at this off and on for awhile now. I finally made a breakthrough this week and started to generate some decent live streams on my Youtube channel, after a lot of misfires. Note this is applicable … Continue reading
Posted in Linux, Network Technologies, Raspberry Pi
Tagged ffmpeg, Microcenter, Speedcheck, Youtube
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How to add private root CAs in SLES or Redhat
Intro From time-to-time I run my own PKI infrastructure, namely issuing my own certificates form my private root CA. I wanted this root CA to be recognized by Linux utilities running on Suse Linux (SLES), in particular, lftp, which I … Continue reading
Fishcam using Raspberry Pi and some network tricks
Intro There are more articles about running a webcam using Raspberry Pi than Carter has pills. Why bother to create another? This one is unique insofar as I created a fishcam at a school with a restricted network. None of … Continue reading
The IT Detective agency: Live hack caught, partially stopped
Intro In my years at cybersecurity i’ve been sufficiently removed from the action that I’ve rarely been involved in an actual case. Until last night. A friend, whom I’ll call Jute, got a formal complaint about one of his hosted … Continue reading
Evaluation of WPI’s multiple camera coprocessor using Raspberry Pi
Intro There’s some good and some not-so-good about the new WPI-provided way to handle multiple video streams using a Raspebrry Pi. ELP Cameras problems I have bought many of these ELP cameras last year and this. I may be a … Continue reading
Posted in Linux, Raspberry Pi
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Google Hangouts Meet – what do these IPs all have in common?
173.194.207.127 209.85.232.127 64.233.177.127 64.233.177.103 74.125.196.127 They all have been used by Google’s Hangouts Meet based on my observation. If you have an environment which uses proxy authentication, the above IPs do not play well with that. So you’ll need to … Continue reading
Consumer Tech: amazing little Bluetooth adapter for your car
Intro My old car I decided finally needed a touch of Bluetooth connectivity. But how to do it without spending a fortune? The details I found this amazingly inexpensive gadget on Amazon that describes itself as follows: Handsfree Call Car … Continue reading
Great serial port concentrator: Raritan Dominion
Intro Every now and then you find a product that is a leap ahead of where you were. Such is the case for us with regards to our product of choice for serial consoles. The old For Bluecoat (Symantec) proxy … Continue reading
Posted in Admin, Security
Tagged DigiConnect, Dominion SXii, Raritan, terminal server
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Counting active leases on an old ISC DHCP server
Intro Checkpoint Gaia offers a DHCP service, but it ias based on a crude and old dhcp daemon implementation frmo ISC. Doesn’t give you much. Mostly just the file /var/lib/dhcpd/dhcpd.leases, which it constantly updates. A typical dhcp client entry looks … Continue reading