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- Can you go from Terminal 1 to Terminal 2 in O’Hare without going through the security lines again?
- How to test if a web site requires a client certificate
- F5 clustering tips
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- Live stream to YouTube from a Raspberry Pi + webcam or USB microphone
- 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
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Author Archives: john
Can you go from Terminal 1 to Terminal 2 in O’Hare without going through the security lines again?
Yes. Yes, at least if you walk. Not sure about other transportation options. Count on about 13 minutes for the walk. Not sure why this information is so hard to find… Sometimes you land at one terminal and have to … Continue reading
How to test if a web site requires a client certificate
Intro I can not find a link on the Internet for this, yet I think some admins would appreciate a relatively simple test to know is this a web site which requires a client certificate to work? The errors generated … Continue reading
Posted in Admin, Linux, Network Technologies, Raspberry Pi, Security, Web Site Technologies
Tagged client certificate
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F5 clustering tips
Intro I was having trouble with one of my new F5 clusters. I thought I’d be clever and add two new F5’s to the existing cluster, and then remove the old members when everything looked good. But the device groups … Continue reading
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 or USB microphone
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, Logitech webcam, micro USB on/off switch, Microcenter, Speedcheck, Yeti, 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
Posted in Admin, Linux, SLES
Tagged /etc/ssl/certs, lftp, SLES 12, update-ca-certificates
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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