Infrastructure Engineering: Systems, Networking, Databases & the Internet
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Network architecture, internet protocols, database and systems design, and the infrastructure engineering decisions that determine whether real production systems hold up under load.
Cloudflare Free Tier Review: Why It Works for Enterprise
By Andrew Baker, CIO at Capitec Bank There is a truth that most technology vendors either do not understand or choose to ignore: the best sales pitch you will ever make is letting someone use your product for free. Not a watered-down demo, not a 14-day trial that expires before anyone has figured out the […]
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Fix Wireshark Permission Error on macOS: ChmodBPF Guide
If you see the error “The capture session could not be initiated on the device “en0” (You don’t have permission to capture on that device)” when trying to start a pcap on wireshare you can try installing ChmodBPF; but I suspect you will need to follow the steps below:
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Find Max MTU Size on Mac OS X Using Ping (No Fragmentation)
If you have ever tried to use jumbo packets, or trace a weird slowness on the network – one of the things that frequently comes up is packet fragmentation. This is basically where a source machine is sending bigger packets than can be consumed along its pathway to a destination machine. This means the packets […]
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pi2s3: An AMI for Your Raspberry Pi
If you have ever had a Raspberry Pi die on you, you know exactly what the recovery process looks like. You flash a new SD card or NVMe, reinstall your packages, rebuild your Docker stacks, reconnect your Cloudflare tunnel, reconfigure nginx, re-enter your credentials, clone your repos, tweak your cron jobs, and spend the better […]
Read more →Mac Terminal: Check DNS Nameservers in 2 Commands
To view the list of nameservers your mac is using, simply open Terminal and paste the following: Alternatively, you can copy the DNS servers to clipboard directly from the command line (using pbcopy):
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Find MTU Between Two Hosts Using Ping Do-Not-Fragment
If you have ever tried to use jumbo packets, or trace a weird slowness on the network – one of the things that frequently comes up is packet fragmentation. This is basically where a source machine is sending bigger packets than can be consumed along its pathway to a destination machine. This means the packets […]
Read more →Monitor LDAP Queries on Domain Controller: PowerShell Guide
The script below monitors LDAP operations on a Domain Controller and logs detailed information about queries that exceed specified thresholds for execution time, CPU usage, or results returned. It helps identify problematic LDAP queries that may be impacting domain controller performance. Parameter: ThresholdSeconds Minimum query duration in seconds to log (default: 5) Parameter: LogPath Path […]
Read more →Mac: Find Open Ports and IP Addresses with lsof & netstat
Below is a dump of examples of doing pretty much the same thing differently. I mostly use netstat and lsof, coupled with some bash scripts. You can argue that this is overkill, but below is a simple bash function that you can paste into terminal and call it whenever you want to see which application/process […]
Read more →Windows 10: Fix Flashing Desktop Icons in 3 Steps
Just popping this here as I have had this a few times. Have you ever had your desktop icons flash and if you check explorer.exe its using high CPU. If so try: Step 1. Delete the Icon Cache Save the following as a batch file on your desktop and run it as admin: Step 2. […]
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macOS TCP Ping: Replace Ping on ZTNA Networks (No ICMP)
A lot of companies are moving to ZTNA (Zero Trust Network Architecture). This is generally a good thing, it helps cyber posture and it and makes life a lot easier as you no longer need to login to VPN tunnels to manage your cloud environment/s. But one of the few downsides of ZTNA is that […]
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macOS: Find Which Process Is Using a Specific Port
Below is a useful script when you want to see which processes are using a specific port.
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Test HTTP/2 Max Concurrent Streams: Tools & Guide
1. Introduction Understanding and testing your server’s maximum concurrent stream configuration is critical for both performance tuning and security hardening against HTTP/2 attacks. This guide provides comprehensive tools and techniques to test the SETTINGS_MAX_CONCURRENT_STREAMS parameter on your web servers. This article complements our previous guide on Testing Your Website for HTTP/2 Rapid Reset Vulnerabilities from […]
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