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Category Archives: Uncategorized
IPv4 price forecasts for 2022-2023
Having received more than a few requests for a followup post on IPv4 price projections, I finally found some time for it over the summer. Here are updated plots of forecasts for the two coming years, using price information (in … Continue reading
BMW i3’s are tracking you
I bought a used BMW i3 2016 a couple of weeks back. It was time to replace the old car, and the benefits of having an EV in Oslo are very favorable. New (or, 3 year old) cars come with … Continue reading
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Some IPv4 address price forecasting
I spent some time playing around with forecasting second-hand IPv4 range prices the other day. ARIN is the most liquid, so the price development is best seen there: RIPE has a worse fit, but shows the same trend: I’m wondering … Continue reading
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Scaleway Centos7.2 image is vulnerable
UPDATE 2017-11-09: Torgrim Teigstad originally reported this and did some additional testing this week. It appears that all VMs spun from this image use the same hard coded root password, and this exists in the list of passwords being probed … Continue reading
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Doing consulting work
I’ve been working as an independant consultant since January 2017. I left my position as tech lead with Varnish Software, having spent almost five years there, knowing it was time to do something else. I’d like to thank Poul-Henning for … Continue reading
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Scanning for multicast TV channels
In recent times, I’ve cut the cord and stopped watching TV from my local cable company. This gave the need to look for IPv4 multicast groups that had active talkers, so I (on occasion) could stream some live TV over … Continue reading
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Disable Spotify song change notification in Debian Linux
Recently Spotify started sending notifications to the desktop on song change. This is unnecessarily annoying and breaks my flow, so it had to go. (and since I usually just listen to the same playlists anyway, I’m very well aware what … Continue reading
Converting a Varnish 3.0 VMOD to 4.0
So we’re getting closer to releasing the first proper 4.0 version of Varnish Cache. One of the things we need to fix is to get all the vmod writers to make sure their vmod works with the new version. Here … Continue reading
libvmod-cookie; simpler cookie handling in Varnish VCL
I’ve written a Varnish module (VMOD) to simplify handling of HTTP cookies in Varnish VCL. In essence it does the usual stuff you’d usually do with regular expressions, but with much simpler syntax and readability. It works by parsing the … Continue reading
Internet routing with Quagga/Linux on Free Internet eXchange Oslo (FIXO)
I run a small internet routing AS (autonomous system), mostly to keep my routing skills up to date (somewhat). AS56809 get transit from Blix Solutions AS, and it is also present on Free Internet eXchange Oslo (FIXO for short). FIXO … Continue reading
Blog of Lasse Karstensen 