* Posts by M0PLT

7 posts • joined 2 Jul 2018

Which? That smart home camera? The one with the vulns? Really?

M0PLT
Boffin

Which? have form!

Which? have pushed Power Line Technology (as has El Reg) and LED lighting despite the weight of evidence to prove many of these products (all PLT) fail EMC standards. Their forums were often full of people pointing out the interference from LED lighting to their VHF radios, yet Which? continued with the power-saving mantra.

The Reg chats with Voyager Imaging Team member Dr Garry E Hunt

M0PLT
Pint

Where is this man's Knighthood?

A far worthier recipient than the bankers!

A brilliant story that needs to be told to the uneducated masses of this once great nation!!

Dropbox plans to drop encrypted Linux filesystems in November

M0PLT
Boffin

Re: Encryption

You are quite right. It is a LUKS container which runs the EXT4/BTRFS/XFS filesystem inside. Looking at my discs, you would see /dev/sda1 as /boot, /dev/sda2 as <swap>, and /dev/sda3 as a LUKS encrypted container.

I am failing to see Dropbox's issue - although I do not use it. I have CentOS 7 running LUKS and EXT4 partitions with user_xattr and acl. Granted, I probably had to tweak the installation to ensure they were set as default options. Surely a simple check during installation could be used to flag if the underlying filesystem lacks the necessary options?! Or is that too easy...

Now that's a dodgy Giza: Eggheads claim Great Pyramid can focus electromagnetic waves

M0PLT
Boffin

Re: A wavelength of 200 ... metres

Sorry, but Radio 4 long-wave is on 198 kHz; and their frequency is phased-locked to the NPL so it can be used as an off-air standard.

East Midlands network-sniffer wails: Openreach, fix my outage-ridden line

M0PLT
Boffin

Re: It could be an EMC issue!

2.45 GHz and 5 GHz used for Wi-Fi are license-free Industrial, Scientific & Medical bands. They can be full of noise generated by ZigBee, Bluetooth, A/V senders, Baby monitors, and microwave ovens (at 2.45 GHz). Wi-Fi should not be seen as reliable or protected spectrum. Only a physical cabled connection - where practical - using Cat5/6 and clean Ethernet can be considered reliable. Powerline devices should be thrown in the nearest WEEE skip. They may not be affecting your radios. They will be affecting someone else's!

M0PLT
Boffin

It could be an EMC issue!

There have been cases in the past where an entire village has suffered regular outages of their ADSL signals thanks to local REIN sources. Power-Line-Networking/Power-Line-Technology is a known cause of interference that leaks from the mains-wiring with the very same frequencies DSL services are trying to use (same modulation techniques). I wonder how many in the village are using Sky Q with the PLT switched on (as it is by default!)? Poorly maintained electric fences can also act as spark-gap transmitters which generate large regular wide-band electromagnetic pulses which affect the 3 to 30 MHz HF band. Openreach "engineers" I have spoken to do not know the first thing about EMC, or the hoards of junk electronics that can cause it. They are not going to find a REIN issue with a casual visit to the end-user's home; and neither with Ofcom with a casual drive-through as their equipment is not sensitive enough to pick-up the interference!

Boffins want to stop Network Time Protocol's time-travelling exploits

M0PLT
Boffin

Re: Time NTP was upgraded(See what I did there!)

The GPS system is used to contribute to the accuracy of UTC. You can configure your NTP server to display UTC, or your local time zone. The Meinberg LANTIME M600 on my desk ticks away in UTC. I sat up to watch the last leap-second. There was a pause at 23:59:59 for 1 second to allow the planet to catch-up before the clock ticked over to 0:00. The NTP protocol can correctly handle leap-seconds - assuming the correct parts of the NTP protocol have been coded into your device. If the code-monkey skipped it as irrelevant, then yes, your computer/IoT crap will throw a wobbly!

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