Category Archives: Uncategorized

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

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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

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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

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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

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HTTP Live Streaming (HLS) tools

Delivering video over HTTP is up and coming. The two protocols that seem to be winning (currently) are HLS and HDS. These are my notes from playing around with HLS. If you want to play HLS on Linux, this python … Continue reading

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Varnish Cache development news

Short update on activities in Varnish cache development: Work is being done on getting access to the request BODY inside Varnish. This feature has been requested for a while, particularly by the security.vcl guys. See daf0e2c. The 2013Q1 Varnish Developer Day will … Continue reading

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