Author: Martin

As I store quite a lot of data on my Nextcloud at home, it was clear to me when setting-up my new virtualized system at home that I did not want to store the data in the virtual disk image that holds the system partition. If I ever need to migrate the VM or need to extend the storage space, the last thing I want to do is to fiddle with the system partition. KVM/Qemu offers a number of different ways to map additional storage into a virtual machine and surprisingly, the performance of the different options differ quite significantly!

Continue reading A Fast Filesystem For My Cloud at Home: Mapped vs. VirtIO

One of slowest topics in networking is probably the take-up of IPv6 on the client side. Despite this, I’ve been evolving the IPv6 connectivity of my servers at home over the years and with my recent evolution to virtual machines and a new DynDNS hoster, things are now even smoother and a lot simpler.

Continue reading Evolving My IPv6 Setup at Home

One thing that astounded me when reading the 4G specs for the first time many years ago was that there was no separation anymore between attaching (registering) with the network after power-on and activation of a default bearer (getting an IP address). It looks like this will change again in the 5G core network.

Continue reading The 5G Core – Part 5 – The Divorce of Registration and Session Management?

In spring, there are a few weeks in Germany with public holidays sprinkled over weekdays. In many cases, taking an additional day off results in a very long weekend that can, of course, be used to learn new stuff. This time around I particularly had a look tmux which, after the expected steep learning curve, makes working in the shell so much easier.

Continue reading I Finally had My TMUX Moment

While I’ve had a 1 Gbit/s Fiber connection at home in Paris since 2014 with speeds well beyond 250 Mbit/s downlink and 50 Mbit/s uplink, most people in Germany can still only dream of fiber connectivity. So while I consider myself fortunate with fiber in Paris and at least 50 Mbit/s down – 10 Mbit/s up in Cologne the next step has now been taken, 10 Gbit/s symmetric for home users!

Continue reading 1 GBit/s At Home Was Yesterday! 10 Gbit/s Is The New Black!

Last month, Ubuntu 18.04 LTS was released and I could hardly wait as I wanted to do a major redesign of my cloud services at home to streamline my setup and make it more flexible, extensible and powerful. So let’s virtualize it!

Continue reading Upgrading and Virtualizing my Cloud at Home

At least in its current incarnation, the 5G core network specification in 3GPP TS 23.501 makes it quite clear that 3GPP aims to cut the cord to older network generations. Handovers, for example, have only been defined between 4G and 5G. No interworking is planned to 2G and 3G networks. But as in Asterix comics where all of Gaul is under control of the Romans except for a small village there is one exception to this rule: SMS!

Continue reading The 5G Core – Part 4 – SMS Forever!

Back in 2013 I wrote a post about how long I thought my SSD would last based on the amount of data I write to the drive on a daily basis. Back then my daily write rate was 10 GB a day and based on a calculation method of Anandtec I estimated the lifetime of my SSD to be at least 14 years. In the meantime others have done practical tests of how many write cycles SSDs really endure before they die so I came back to the topic once more with my usage scenario.

Continue reading SSD Lifetime Estimation Revisited

Ever since GPRS came around the corner one and a half decades ago there’s been this concept of international roaming with ‘local breakout’ in which IP packets of roaming subscribers are sent directly to the Internet from the visited network. Sounds nice but in practice, it’s not really used. Instead, the current approach is referred to as ‘home routing’ in which IP packets of roaming subscribers are tunneled back to the home network and only from there to the Internet. So will this change with 5G core networks?

Continue reading The 5G Core Network (5GC) – Part 3 – Local Breakout

Good news on the privacy front!: When I recently installed Firefox on a new Android phone I browsed a bit through the settings and noticed that it is now possible to delete all kinds of data when the browser is closed. This includes cookies and offline website data that is often used to track usage. Also, it’s possible to reject 3rd party cookies. Very good, I’ve been waiting for these features for a long time on mobile. It could be that they’ve been in Firefox Mobile for quite some time already but this is the first time I’ve noticed it!