Network

I noticed that the Web UI of the Pi-hole I run at home (http://127.0.0.1:8053/admin) had become completely unreachable. All I got back was Connection reset by peer, and neither the browser nor curl could see anything. DNS resolution (port 53) was still working fine, so there was no real damage. As far as docker ps went the container was shown as healthy, so I had not been worried, but when I looked into it I found that the problem itself went back six days, to 2026-08-01. [Read More]

The IP address ledger I had been keeping in GoogleSpreadSheet was no longer keeping up as the number of devices grew. The IP addresses actually in use and what the sheet said drifted apart more and more, and I was reaching the limit of taking stock by hand, so I decided to start phpIPAM with Docker and move IP management there. Starting it with Docker I settled on the following docker-compose.yml. [Read More]

When I tried to connect from macOS to a QNAP’s Samba share for the first time in a while, for some reason I was denied and could not log in even though I was entering the correct password. For reference, the macOS here is the latest Sonoma environment. Investigation Logging in from Windows works fine Logging in over afp works fine Logging in from older macOS (High Sierra or Mojave) works fine too How to fix it Either method is fine as long as it solves the problem [Read More]

At work I have been asked about not being able to connect to shared folders (Samba) since somewhere around Windows 10, and recently the questions from people who have updated to Windows 11 have increased as well. Let’s check the items below! Enabling the SMB1.0 client On Windows 11 the “SMB1.0 client” is disabled in the default settings. The “SMB1.0 client” standard is old and vulnerabilities have been reported for it, so Microsoft disables the “SMB1.0 client” from a security point of view, and that accounts for most of the cases where the connection fails [Read More]

There are times when you want to know the subnet range of an ISP or similar. For example, when you want to allow SSH only from your home subnet on an external server such as AWS or a VPS, and therefore want to know the range of the dynamic IP in your home environment. You can look it up with whois, which is a surprisingly simple method (well, the web based JPNIC WHOIS Gateway (in Japanese) is simple too…) [Read More]

Symptoms On VMware Fusion 8.5.4 under macOS High Sierra (10.13.6), the network of the guest OS in VMware Fusion occasionally gets disconnected The guest OS is Windows10, and once the network drops, changing to NAT or bridged does not help restarting the network in Windows does not help disconnecting the network adapter on the VMware side does not help The solution The simplest thing is to restart the Mac, but when the same symptom happens over and over while you are working, restarting every time is a hassle [Read More]