"Blogs are a conversation nobody wanted to have with you" — Michelle Wolf
The Wi-Fi adapter on my VivoBook 17 has been acting up under Ubuntu 18.04 LTS insofar that at a random point in time, possibly accelerated by power saving features, the Wi-Fi will stop working with suspicious syslog entries: ath10k_pci 0000:03:00.0: failed to wake target for read32 at 0x0003a028: -110 The usual tricks (suspend/resume, reload driver, … Continue reading Resetting a PCI device
The 5G mobile network specification introduces network function virtualization [NFV] which enables mobile network operators (carriers henceforth) to expose network resources to business applications as PaaS solution building blocks [SBB]. Naturally, this moves 5G into the focus of software architecture. Unsurprisingly, the NFV specs detail services from the carrier's point of view, so they are … Continue reading Software architecture for 5G networks
In this post I talk about setting up and securely operating development tools like Jenkins and Gitlab on a server connected to the internet. All applications run behind a firewall and a reverse HTTP proxy which allows only HTTP requests from selected users through who authenticate themselves with client certificates. Putting web-facing software on the … Continue reading Securing a development server
A quick note to myself the next time I stumble over this: when you instruct Blogger to map the blog to a 3rd party (custom) domain it basically instructs you to add three entries to your domain's zone file: 1. a mapping from the domain to ghs.google.com 2. a mapping from some weird subdomain you'll … Continue reading Using Blogger with a custom domain: the zonefile dot problem
I started quite a while ago moving a pet project to ip6. While it doesn't involve any programming per se, it turned out to be quite a complicated process involving multiple configuration steps. Thus, for your enjoyment I present: running a website on ip6 with Ubuntu 14.04 (older versions won't work because their kernel doesn't … Continue reading Running a website on ip6
In many larger WLAN setups you'll find repeaters or extenders which spread the WLAN to farther places on the floor. Often they are set up in such a way that they use the same WLAN name (SSID) and password. In that case the WLAN hardware on your laptop will pick the best access point and … Continue reading Linux picking the best access point in a WLAN with repeaters
With quite some regret I had to decommission the trusty HP 4720s - readers of this blog will remember the love-hate relationship that grew to come between Ubuntu, it and I. Now it's time to try Ubuntu on the new laptop: Asus N56VB. Because I'm not much for experiments (those come to find me on … Continue reading Ubuntu 12.04 (64bit) on the Asus N56VB
As I am a frequent guest in public WLANs I spent some time looking into ways to connect safely to both the corporate network and the rest of the internet while enjoying the amenities of a cafés' or hotel's wifi. Because of its simplicity and universal availability I like SSH tunnels which are easily set … Continue reading Automatically starting an SSH tunnel in Ubuntu
A while ago I noticed that Firebug would report 40-100ms DNS lookups for sites that could not possibly not be in the local DNS. When reloading a page that had just been rendered, the same DNS lookup delays would show up over and over. I could not verify whether it's an issue with my ISP … Continue reading Installing a local DNS cache on Ubuntu 11.10
Over the course of my involvement [1] in my Indonesian company's website, the question of how to design a website to deal with slow and bad network links presented itself over several occasions as most of our users surf either over a mobile connection or a similarly dimensioned fixed line. While optimizing design and resources … Continue reading The impact of network packet loss on HTTP latency
