After I have dealt with the most essential IPv6 features for me in parts 1 to 3 (see here, here and here) this part focuses on the bits and pieces that have to fall in place in 3GPP GSM, UMTS and LTE networks to make it work. First of all, mobile devices need to support … Continue reading IPv6 Crash Course – Part 4
Today follows part 3 of my IPv6 crash course. You can find the first two parts here and here. ARP Becomes Neighbor Detection To translate layer 3 IP addresses into layer 2 MAC addresses, the Address Resolution Protocol (ARP) was used in IPv4. In IPv6 a similar mechanism is used and referred to as Neighbor … Continue reading IPv6 Crash Course – Part 3
This post is the continuation of my crash course on IPv6. You might want to check out part 1 here before continuing. Auto-Configuration, Local Addresses and Router Advertisements IPv6 has auto-configuration functionality built that doesn't require a configuration server in the network as in IPv4. When the stack is started, the first thing it does … Continue reading IPv6 Crash Course – Part 2
IPv6 has been 'just around the corner' for many years now but hasn't really surfaced so far. For LTE, Verizon currently plans to make IPv6 mandatory and IPv4 optional, which will probably mean in practice that the first thing most devices will do is to get an IPv4 address. One way or the other, however, … Continue reading IPv6 Crash Course – Part 1
The other day I ran a post on the behavior of the SIP VoIP implementation of my Nokia N95 and that I was quite surprised to see it sending keep-alives to the network every 30 seconds. While this is normal and necessary to keep the NAT firewall open, it does have an impact on battery … Continue reading Why IPv6 Will Be Good For Mobile Battery Life
In part 8 of my Starlink series, I’ve been looking at downlink throughput with a Windows notebook. The maximum speed I could achieve with iperf3 was around 30 Mbps, while tools like speedtest.net and LibreSpeed could easily reach 150 to 200 Mbps. So what’s the difference and which speed test reflects real world use?
In part 5 of this series, I’ve been looking at how companies like Linode, DigitalOcean and Amazon offer managed Kubernetes cluster instances. In other words, they provide Kubernetes clusters in freely configurable sizes, which can then be used for projects. The approach is quite different from how I thought it would work: Effectively, you get … Continue reading Kubernetes Intro – Part 8 – Deploying Stuff into a Managed Cluster
O.k., I’m going deeper and deeper down the layer 7 routing rabbit hole. As I like to have a plan B when it comes to my infrastructure at home, I have backup Internet connectivity over a separate Internet connection and a separate router. When main connectivity fails, a script detects that my services are no … Continue reading Routing it Your Way Part 3: Socat for OpenVPN Forwarding
In well-built networks with lots of capacity on all links between source and destination, even fully loaded links behave nicely and packet delay remains acceptable. In some scenarios, however, particularly when the bandwidth on the last leg is low, and packet buffers on some routers in the network are overdimensioned, packet delay becomes a real … Continue reading Wondershaper In Action
There must be few people on this planet that have not been affected by the Covid-19 pandemic this year. It has certainly brought profound changes in my way of working and in the things I did this year. So while the pandemic restricted me to stay at home most of the time, it ‘moved me … Continue reading Things That Moved Me In 2020