In the good old fixed line SIP world things are straight forward when a SIP user wants to call someone: INVITE, TRYING, RINGING, OK and you are there. In the VoLTE world things are a bit more complicated as the service tries to replicate the circuit switched telephony service. Here, a media stream can already sent before the receiving party answers the call so the caller hears an alerting (ringing) tone or even music in some cases. This is what’s known as early media in VoLTE and there are two ways how this is done in practice:
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How Fast Is That SSD In My Notebook?
In theory the 1 terabyte Samsung 840 Evo SSD I use in my notebook has a sustained write performance of well over 400 MB/s according to this fabulous review over at Anandtech. That is two thirds of the theoretical maximum speed the SATA 3 interface can deliver. While this is all nice and well I wondered how fast the SSD would be in combination with my notebook and my typical usage scenarios.
Pushing My Owncloud File Size To 3 GB
By default, Owncloud is configured to handle files up to a size of 512 MB. While that’s probably good enough for most, I do run into this limit rather often. There are instructions how to increase the limit from an Owncloud point of view but when I recently wanted to transfer a 2.7 GB file my setup failed outside of Owncloud. It took me a bit before I found out how to fix it so I thought I put together all things I have now learned about how to configure a system for large file transfers in Owncloud with a number of security and privacy tips thrown in for good measure.
Time To Switch From Opera to Firefox On Mobile – At Least For Me
Ever since I discovered last year that Opera’s web browser on my smartphone was responsible for strange queries to my web server from China to generate a thumbnail image (see ‘When Opera Calls From China‘) it had been at the back of my mind that Opera is not open source and hence I have little trust in it. These days it also seems like Opera is going to be sold to a Chinese consortium which would make it even less attractive for me to continue using it. Time to change to another browser on my Android based devices then. How about Firefox?
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MouseJack Vulnerability – Have You Already Patched Your Mouse?
Quite strange that only Bruce Schneier has picked up on this so far but researches have developed a proof of concept of how to exploit HID (Human Interface Device) USB dongles for wireless mice and keyboards to accept keystrokes from rouge third party transmitters.
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Eduroaming in Utrecht
Eduroam is a great Wi-Fi login system for students and researches that works with certificates for secure access of on-campus Wi-Fi networks and has the added benefit that Eduroam users can attach to any other Eduroam network around the globe without changing their Wi-Fi configuration. That’s the theory and paper is patient. So when I recently was at the University of Utrecht in the Netherlands I tested if the theory holds up with an Eduroam setup of the University of Vienna.
What Is My Theoretical Top Internet Speed?
Theoretical Internet speeds in fixed line and mobile networks keep rising, which is a nice thing. Unfortunately, round trip delay times are not decreasing at the same rate, mostly due to physical limits these days which at some point will limit the maximum throughput of a single TCP stream no matter how fat the pipe is and how fast a server can deliver data. So where is this limit?
Good Advice To Block, Detect and Mitigate Ransomware Damage In Companies
Today I came across this great article by Robert Penz in which he describes measures how companies can reduce the risk of Ransomware encrypting their files on network shares and other devices in the local network. Also, he describes how a company can prepare itself in case it still happens to reduce their downtime as much as possible. I found one of his suggestions of particular interest: Snapshots of network shares.
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One German LTE Network Operator Now On-Air with 50 MHz
When it comes to investigative reporting in the telecommunication domain, German telecoms news website Teltarif certainly is at the forefront. Recently they noticed that the public network coverage maps of one of the network operators in Germany now show that in many cities, they have deployed LTE in three different frequency bands.
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The Samsung SSD Bug Caught Me Again
I’ve been using SSDs for many years now and I’m more than happy as the speed difference on a notebook compared to hard disks is just like day and night. Unfortunately I use a one terabyte Samsung 840 Evo in my notebook that has now bitten me for the second time.