News archive April 2012 - Koos van den Hout

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2012-04-30 (#) 8 years ago
The dink is back! New episodes of Chub Creek, my favourite Canadian podcast!

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2012-04-30 (#) 8 years ago
I moved the weatherstation website to (I hope) better URLs so they will be easier to find.

http://weatherstation.idefix.net/: Weather station Utrecht Overvecht the Netherlands
http://weerstation.idefix.net/: Weerstation Utrecht Overvecht.

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2012-04-30 (#) 8 years ago
A real "why do I still bother with legacy IP" (and NAT) moment today. I tried to use the IRC DCC protocol to receive a file from someone and the client of the other party was running behind IPv4 nat. "Active" and "Passive" dcc failed. But we both can use IPv6 so I upgraded that IRC connection to v6 (I changed the OFTC serverlist to use irc6.oftc.net). This restored end to end connectivity and the file was transferred.

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2012-04-29 (#) 8 years ago
Komende dinsdag 1 mei gaan de werkzaamheden aan het mast deel van de zendmast Hoogersmilde beginnen. Ik zou er graag bij zijn maar dat gaat echt niet lukken. Maar ik kan wel mooie reportages volgen: Radio en televisie Nederland heeft mooie foto reportages: Herbouw zendmast Hoogersmilde en de regionale omroep van Drenthe, RTV Drenthe heeft een live streaming webcam herbouw zendmast Smilde. Ik ga zeker meekijken.

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2012-04-29 KPN 3G speed for a tethered device on the Nokia E71 8 years ago
My speedtest on kpn umts My work mobile phone/mobile data subscription with the Nokia E71 will change from KPN Netherlands to T-mobile Netherlands soon so I decided to see if this means any change in Internet speed and ran a speedtest. 1.35 Megabit/second down and 350 Kilobit/second up. Funny part: when I first tested this the speed was 1 Megabit/64 Kilobit. Somewhere an upgrade happened.

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2012-04-28 (#) 8 years ago
Mooi artikel in de (papieren) Volkskrant: "Niet hacker, maar bedrijf is schuldig". Een beetje tegenwicht tegen het artikel eerder over de KLPD high-tech crime unit (ik vond dat artikel bij vlagen meer een advertorial "werken bij de KLPD"). De hele discussie die we nog kennen uit de jaren 80 en 90 over 'vinden van veiligheidslekken' versus 'inbreken' komt weer terug alleen zitten we nu in een situatie waar tijdens het zoeken naar de lekken in je site door iemand uit Nederland (die eventueel nog traceerbaar zou kunnen zijn) er tegelijkertijd drie anderen uit andere delen van de wereld ook bezig zijn. En die anderen gaan niet met hun verhaal naar webwereld maar verkopen de gevonden gegevens.

Een beter artikel over computerbeveiliging en de schuldvraag als het misgaat, hoewel Chris Verhoef vooral de oplossing zoekt in betere opleidingen in informatica, toevallig zijn werk. In ieder geval hamert hij op het valideren van invoergegevens (never trust input!) en noemt het boek Writing Secure Code.

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2012-04-26 (#) 8 years ago
There is demand for VoIP over IPv6 so the excuse "there is no demand" or "you're the first one to ask" is no longer true: VoIP6 provider wanted in the Netherlands. Get in touch with them when you are serious.

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2012-04-26 (#) 8 years ago
@baljemmett don't worry, the phishers will send another mail with the right url
2012-04-25 (Pictures of two #transmitter masts I made a few weeks ago. A great day for those pictures, not too cloudy...) 8 years ago
Google+Koos van den Hout : Pictures of two #transmitter masts I made a few weeks ago. A great day for those pictures, not too cloudy and a nice sun. Here and there a bit much sun on the white uhf dvb-t panels but I found good pictures.

http://pictures.idefix.net/zendmasten/amersfoort.shtml Transmitter Utrechtseweg, Amersfoort, the Netherlands
http://pictures.idefix.net/zendmasten/leusden.shtml Transmitter Lockhorstweg, Leusden, the Netherlands

(#cthumb pages confuse google+ I guess)
2012-04-25 (#) 8 years ago
Recent in de aanloop naar het paastreffen van de nvhpv had ik ook tijd om in Amersfoort en Leusden een stop te maken om daar de zendmasten te fotograferen. Opvallend is dat die laatste duidelijk nieuw is en nog niet volhangt met van alles. Alleen digitenne en mobiele telefonie.

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2012-04-25 (#) 8 years ago
Interesting reading about making services available over IPv6: RFC 6589: Considerations for Transitioning Content to IPv6. A quite practical document about transitioning services to IPv6, considerations and possible impact. I'd consider this document required reading for organisations active on the Internet who want to stay active.

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2012-04-24 (#) 8 years ago
Updated the version number for my homepage because I rewrote the logic behind it. Several gathering functions now gather information from multiple sources between the wanted start and end time and a different function feeds all this to predefined display functions per defined type of 'news'. The same code which does a selection of 'recent' for this page is reused to do that selection for a month: News archive 03/2012 or for a year. In the long run I think I want the month to be the 'standard' archive unit. The 'everything' archive is gone and News archive - Koos van den Hout now shows the list of all months you can try.

This all in perl, and with some interesting programming to make it all work. At the moment there are 4 active sources: the irregular files, the news items, tweets and googleplus items. But adding sources is simple.

I expected the processing time to decrease a bit because data is now not even gathered when it's outside the wanted window but I see no real change in those numbers.

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2012-04-24 (#) 8 years ago
@ArjenKamphuis @Paapst democratie is geen media-spektakel dus moeten we ook rustig wachten tot de stemmen goed en controleerbaar geteld zijn
2012-04-24 (#) 8 years ago
RT @mauricewessling: Brein eist verbod op informatie over het omzeilen van internetblokkades. http://t.co/y2RzaqLP Applaus uit Teheran, ...
2012-04-22 (#) 8 years ago
Programming errors that cost actual money can be quite simple: runaway script causing a constant load of about 1.5. This causing the cpu frequency governer to keep the CPUs at full speed, causing the system to warm up about 12 degrees and causing the power use as measured by the UPS to go from 32 to 44 percent.

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2012-04-22 (#) 8 years ago
Als ik op de website van xmsnet kijk naar XMSnet in Utrecht beschikbaarheid gaat de tekst alleen nog maar over diensten op bestaande XMSnet aansluitingen in Utrecht en vooral niet over de mogelijkheid van nieuwe aansluitingen. Kortom, het fiber-to-my-home project gaat nog wel wat jaartjes duren. Met de eisen die ik stel aan een IP provider (vaste adresruimte, ongefilterde smtp toegang, ipv6 en ipv4 ondersteuning) is xs4all nogsteeds de logische keuze. Aansluitingen via andere aanbieders (inclusief Ziggo Internet via de kabel) naar mijn gewenste niveau brengen (met behulp van een server in een datacenter) maken ze dan alsnog duurder dan xs4all.

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2012-04-22 (#) 8 years ago
RT @fanf http://t.co/74yss5jp (pdf) - Worm propagation strategies in an #IPv6 internet.
2012-04-18 (#) 8 years ago
I found a nice feature on the Netgear GS716T switch at home. The default management interface for the switch is a webinterface, but thanks to a remark in the serverfault thread Managed Ethernet switch per-port MAC address translation? I found out it has a telnet interface on port 60000. Indeed, just type 'admin' at the wait remark and use the admin password:
$ telnet .... 60000
Trying ...
Connected to ....
Escape character is '^]'.

(Broadcom FASTPATH Switching) 
Applying Interface configuration, please wait ...admin
Password:********
(Broadcom FASTPATH Switching) >enable
Password:

(Broadcom FASTPATH Switching) #
Interesting information available:
(Broadcom FASTPATH Switching) #show port all

               Admin   Physical   Physical   Link   Link    LACP   Actor
 Intf   Type    Mode    Mode       Status   Status  Trap    Mode   Timeout
------ ------ ------- ---------- ---------- ------ ------- ------ --------
0/1           Enable     Auto                Down   Enable Enable long         
0/2           Enable     Auto                Down   Enable Enable long         
0/3           Enable     Auto     100 Full   Up     Enable Enable long         
0/4           Enable     Auto                Down   Enable Enable long         
(Broadcom FASTPATH Switching) #cablestatus 0/3

Cable Status................................... Normal
Cable Length................................... 13m - 13m
There are commands in the this interface which will instantly reboot the switch, taking quite some time to get networking back. Ooopsie..

I also upgraded the firmware to version 5.0.3.5 and that new firmware even has dhcp filtering available. Quite a nice switch for the money.

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2012-04-16 (#) 8 years ago
Learned a bit the hard way about linux software raid. The first raid I set up had a disk /dev/sdc first giving errors and later removing itself from the array. Sounds like something the raid system should be able to deal with. Shutdown system, remove failed disk, add new disk of the same size, reboot, resync array, done.

Well it wasn't like that, trying to activate the array after reboot kept giving errors like:
# mdadm --assemble /dev/md0
mdadm: /dev/sdc has no superblock - assembly aborted
After trying a lot of variants, I gave up on those superblocks and tried the method described in Mdadm entry in Wikipedia: Recovering from a loss of raid superblock. But I made an error: I did not use the missing keyword for the new disk. Which created a raidset with 3 disks and happily started syncing sdb+sdc to sdd. I aborted that config when I found out, redid it with missing in the right place and got a quite corrupted filesystem. After a 4 hour filesystem check all files (left..) were in lost+found.

Solution for my next software raid (I checked one I built later) and fixed in this one: use the UUID of the created array in mdadm.conf, don't describe the original components. So I made the change to:
# ARRAY /dev/md0 devices=/dev/sdb,/dev/sdc,/dev/sdd
ARRAY /dev/md0 UUID=1103091b:8bc35717:7d583786:8f0370bf
This will come up, even in degraded mode (with a warning about that). And later I added the new /dev/sdc with mdadm --add /dev/md0 /dev/sdc and the wished resync started. Easiest way to get this data in the right format:
# mdadm --detail --brief /dev/md0
ARRAY /dev/md0 level=raid1 num-devices=2 metadata=00.90 UUID=f16f06e4:456974f1:07f865a5:07e04d1c

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2012-04-15 (#) 8 years ago
Cropped screengrab from playing videotape to a miro pctv card over RF Interesting use of an old(-ish) analog tv card: I plugged it into a newish computer to set it up to watch videotape. The chip on the card (Brook Tree Bt848) was recognized but the card itself wasn't recognized right away because the bttv driver really needs more information about the actual card in use. A module parameter needs to be set, a good explanation can be found at bttv page on MythTV wiki. I found the right parameter for the card, and it works. The xawtv application gave lots of errors, but that was mainly because the .app-defaults/Xawtv file (X resources for the application) was so 'old' (1998..) that it disabled all controls. The .xawtv file in my homedir also had old channel assignments from when I lived at a previous address and had cable TV in my 'computer room'.

Anyway, enough history, the card works although the antenna connector is flaky, but the RF output of the video cassette recorder is strong enough to overcome any signal leaks. I can watch some old videotape! Quality is, well, what I expect from a vhs tape and over an RF link. Interesting is that trying to watch video full-screen makes the video have interruptions. The image is a crop from a screengrab made in xawtv.

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2012-04-13 (#) 8 years ago
Fresh cloudy skies on http://webcam.idefix.net/. It's back, someone was kind enough to lend me some room in his window giving a nice view in a north-easterly direction.

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2012-04-12 (#) 8 years ago
RT @UUGeo: Seismometer van #UUGeo registreert aardbeving. Bekijk seismogram door datum 11 Apr 2012 in te vullen op: http://t.co/N7GbSUAw
2012-04-11 (#) 8 years ago
@Wilboard Het product van #commerciŽleTV is kijkers naar reclame. Programma's zijn slechts een middel om dat te bereiken.
2012-04-11 (#) 8 years ago
RT @DeSpeld: Santorum euthanaseert campagne - ‚ÄúJe moet lijden niet eindeloos rekken.‚ÄĚ http://t.co/X28EljBi
2012-04-11 (#) 8 years ago
An update about the collapsed transmission tower/mast collapse in Hoogersmilde:

The concrete tower part of the transmission tower at Hoogersmilde has been repaired and parts for the new lattice mast that will be on top are coming in to the construction site. Radio-tv-nederland has all the pictures and updates for the rebuilding process of the Hoogersmilde transmitter.

And last night the FM radio transmitters at Lopik were brought back to full power after repairs because of the damage to the transmitter in a small fire on that same 15 July 2011.

Via Radio-tv-Nederland

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2012-04-09 (#) 8 years ago
RT @mrbill: $1B worth of hipster sepia filters.
2012-04-09 (#) 8 years ago
@mrbill software to make the results of a bad camera even worse
2012-04-09 (#) 8 years ago
The changes for the Bundesnetzagentur Senderdaten Rundfunk now lists all transmitters for the MTVNL multiplexes. Den Haag, Eindhoven, Hilversum, Rijswijk, Utrecht are listed. Some of those have been on-air for a while, so I wonder what triggered this update on the German side.

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2012-04-08 (#) 8 years ago
@alyankovic so the eggs you find at christmas may not be that old...
2012-04-05 (For the fun of it I decided to 'share my location' on this google+ post. Firefox asked me nicely whether...) 8 years ago
Google+Koos van den Hout : For the fun of it I decided to 'share my location' on this google+ post. Firefox asked me nicely whether I want to let google.com know and I clicked 'yes'. And the result according to google is that I seem to be in Arnhem, the Netherlands. Well, 'not even close' (on a Dutch scale of 'close'). The only thing firefox/google would have to determine my locations are wireless networks and there are enough of them around here to get a reasonable answer. When I look at the list of networks seen in wpa_supplicant I see a few that have been around since at least June 2006.
2012-04-05 (#) 8 years ago
"Donner waarschuwt voor aantasting rechtsstaat" .. welke minister was ook alweer altijd zo goed in die aantastingen verzinnen ..
2012-04-05 (#) 8 years ago
RT @frankieboyle: These snooping laws are genius. To stop terrorists who want to destroy the freedoms we enjoy, we simply destroy the fr ...
2012-04-01 (#) 8 years ago
Morning fog near Fort Voordorp
Morning fog near Fort Voordorp
I'm quite proud of this picture. It originates in talking about photography with a co-worker who pointed me at the great things fog can do around Fort Voordorp. A few days later the morning news mentioned heavy fog so I took the camera, and this is the result.

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2012-04-01 (#) 8 years ago
"Wij gaan zorgvuldig om met uw gegevens" .. in het ongecrypte mailtje ervoor staat mijn BSN #privacyfail
2012-04-01 (#) 8 years ago
@Wilboard de hollywoodfilm met "computers kunnen de 3e wereldoorlog veroorzaken" er in is er: Wargames. Mijn favoriete film.
2012-04-01 (#) 8 years ago
RT @kevinmitnick: I love it! LMAO! http://t.co/zmg6gpAW


, reachable as koos+website@idefix.net. PGP encrypted e-mail preferred.

PGP key 5BA9 368B E6F3 34E4 local copy PGP key 5BA9 368B E6F3 34E4 via keyservers pgp key statistics for 0x5BA9368BE6F334E4 Koos van den Hout
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Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
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