Category Archives: Network Technologies

Network Technologies

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

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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

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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

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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

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Voice and data vlans on one switch port, no vlan tagging: how does that work?

Intro We had a Cisco video conference unit pick up an IP from a data vlan whereas we expected it to pick it up from a voice vlan, where we had assigned it a static IP. What happened? The details … Continue reading

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Linux tip: how to enable remote syslog on SLES

Intro I write this knowing I still don’t know anything to speak of about syslog, but, sometimes you gotta act without knowing. I needed to send syslog to somewhere in a big hurry so I figured out the absolute minimum … Continue reading

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LDAP authentication on the F5 BigIP without Access Policy Manager

Intro I recently received revised guidelines for dmz best practices which mentioned a requirement to implement application-independent authentication using the F5 web application firewall. I had never heard of it and didn’t think it was possible without buying the very … Continue reading

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The IT Detective agency: Some insights into 4096-bit SSL keys

Intro I was recently asked if a new certificate a web site is about to deploy would require any changes to our clients such as needing to import this certificate into their Java keystore. The details Well, I saved the … Continue reading

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Whois information without the pushy hard sell tactics

Intro Did you ever want to learn about a domain registration but were put off by the hard sell tactics that basically all web-based whois searches subject you to? Me, too. Here’s what you can do. The details Linux – … Continue reading

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Measuring bandwidth on Checkpoint Gaia

Intro Sometimes you don’t have the tools you want but you have enough to make do. Such is the case with the command line utilities of the CLI of Checkpoint Gaia. It’s like a basic Linux. The company I consult … Continue reading

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