News archive July 2009 - Koos van den Hout

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2009-07-28 (#) 10 years ago
The firewall at work got adjusted to not keep NAT state (cisco-term: xlates) for non-NAT sessions. So now I can run our ntp pool server at maximum speed again without the firewall overflowing its state tables. If you ever run into this problem, the right command is xlate-bypass.

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2009-07-23 Mobiele TV volgens de markt 10 years ago
Als je een aanbieding als World's Smallest Portable DVB-T Digital TV (2.4 Inch) ziet vraag je je af waarom KPN mobiele tv of Callmax / Mobiele TV Nederland uberhaupt nog zo moeilijk doen met een apart 'mobiel TV' aanbod via andere technische standaarden (KPN mobiel dvb-h, callmax en mobiele tv t-dmb). Mobiele TV is door internationale aanbieders van apparatuur allang gedefinieerd als kleine DVB-T ontvangers die FTA DVB-T kanalen ontvangen. Nu nog deze wijsheid bij de Nederlandse contentaanbieders en bij de frequentieverdelers.

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2009-07-21 (#) 10 years ago
Seeing another set of DVB-T DX pages by Hans makes me think I should have a look at parsing the vdr files from w_scan into an automatic DX logbook, noting when muxes are first found. I collected the output files since 3 January 2009. I started doing that after I saw the WDR program at 674 MHz so that was not logged in that format. Documentation: VDR file format.

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2009-07-20 (#) 10 years ago
Gisteren gingen we (lig) fietsen en bij het plannen van de route namen we een item van mijn foto wensenlijst mee: we zijn langs de Gerbrandytoren gefietst, bekend als zendmast Lopik te IJsselstein.

Gelukt.. Zendmast lopik te IJsselstein / Gerbrandytoren

Meer informatie over de Gerbrandy Toren: De Gerbrandytoren te IJsselstein Gerbrandytoren - Wikipedia Nederland
De zendmast is natuurlijk bekend van de rol als de grootste kerstboom van de wereld als aan het eind van het jaar de tuidraden voorzien worden van lampjes. Altijd in TV-gidsen gestaan als 'Lopik' maar door een gemeentelijke herindeling ooit van Lopik naar IJsselstein 'verhuisd'.
Ook leuk is om op te graven in de geschiedenis hoe hard Nederland 1, 2 en 3 ooit over ons uitgestrooid werden: het Nozema TV frequentieoverzicht uit 2002 geeft 100, 1000 en 1000 kiloWatt ERP (!). Dat gaat nu met 10 kiloWatt per DVB-T multiplex.

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2009-07-19 (#) 10 years ago
Logo TV Gelderland In the dvb-t scan yesterday evening late:
TV Gelderland :642000:I999B8C999D999M999T999G999Y999:T:27500:7041:7042:7043:0:1104:0:0:0
Radio Gelderland:642000:I999B8C999D999M999T999G999Y999:T:27500:0:7112:0:0:1111:0:0:0
Part of Digitenne bouquet multiplex 1 at 642 MHz. The transmitter could be Oss or Veenendaal given distance and transmitter power. I only noticed it yesterday but now I see it in the w_scan output a few times. The reception is not error-free (I had to wait a bit for a chance of a screenshot with not too much distortion).

No extra foreign channels from the dvb-t scans.. yet. I keep an eye on the tropospheric ducting forecast for northwest europe. I also updated the DVB experiments page with the DX results.

Bouquet or Multiplex? It is described as bouquet at DVB-T zenders Digitenne Nederland but the mpeg standard term for multiple program streams in one transport stream is 'multiplex'. Bouquet in DVB terms means a set of 'programs' logically grouped together.

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2009-07-18 (#) 10 years ago
Tijd om wat aan mijn ligfiets te doen: het stuur was verbogen geraakt, vermoedelijk als gevolg van een harde val. Het nadeel van aluminium: daar buig je weinig aan terug. Maarja, het is zoveel lichter. Ik heb op Cycle Vision een praatje gemaakt met de mensen van Nazca Ligfietsen en die konden heel snel een vervangende stuurbocht opsturen. Mijn vraag was natuurlijk hoe ik het stuur uit elkaar moest halen, vooral de (de)montage van de bar-end shifters was me niet duidelijk. Bij de Shimano techdocs site kon ik de gewenste documentatie en tekeningen vinden, en toen was het ineens allemaal wel duidelijk. Stuur gedemonteerd, alle tie-wraps er af, oude stuurbocht eruit, nieuwe stuurbocht er in en weer alles gemonteerd. Ik denk alleen dat ik voor de vakantie ook nog remkabels wil vervangen. Het is wel een lekker gevoel om je eigen fiets gerepareerd te hebben.

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2009-07-17 (#) 10 years ago
I redid a bit of pictures.idefix.net and made a few extra collections public that are public anyway. Now for the wish-list of pictures to take...

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2009-07-17 (#) 10 years ago
What you don't want to see in your data center: Photos: Inside the Fisher fire - Techflash. One interesting effect from that fire was: TV station forced to go old school after fire at Seattle's Fisher Plaza. Found via The Risks Digest.

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2009-07-16 (#) 10 years ago
Time for some website programming: Amazon was notifying me that Amazon 'Product Advertising API' requests (formerly known as Amazon Web Service) now need to be digitally signed. The 'why' of this is probably something with security. For the 'how' I had to revive those braincells which once programmed Amazon Web Service into The Virtual Bookcase. Those braincells took time as I was first browsing in the wrong sourcefiles. But, after having a peek at Jaap's free Amazon PHP Scripts and incorporating the change to sign requests into my sources, I found the right way again.

One of those times I am glad I have a development version of the site (smaller database, code in development), a qa version (production database, candidate code) and a running version (production database, production code) to test changes like this. The visitors of The Virtual Bookcase never saw all the tries in getting the code to work right.

It was a while since I did any serious work on that site. Otherwise it runs on autopilot and I only add new books and reviews from time to time. Ok, the income from the site has dropped in the same way.

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2009-07-15 (#) 10 years ago
Aankondiging vandaag in xs4all.general: Tour de France via IPv6. Streaming via IPv6, het kan... voor xs4all klanten. Goed om te zien dat omroep.nl weer actief is met innovatie. Net als een vorig experiment (Nederland 1 HD via multicast) wordt het pas aangekondigd als het evenement al een aardig stuk onderweg is, wat meer met rechten te maken heeft dan met de techniek.
Update : De stream met beeld is alleen beschikbaar tijdens de etappe overdag en tijdens de 'avondetappe'. De radio1 stream doet het de hele tijd, die heb ik dus al succesvol beluisterd vanaf thuis.

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2009-07-14 (#) 10 years ago
Wardriving results 22 June - 12 July : 829 new networks with GPS locations according to the WiGLE stats. The only special wardrive was a ride together with another wardriver to Enschede. I had the 802.11a scanning enabled, he had a different antenna type.

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2009-07-13 (#) 10 years ago
Some websearching suggests my headaches with mISDN could be solved by using the qozap driver which I get when I compile zaptel-sources. Just a bit of configuring asterisk differently... time to find some time for that somewhere.

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2009-07-13 (#) 10 years ago
Yesterday evening I installed a 6-tape DDS-3 changer in the homeserver greenblatt and activated the latest ubuntu kernel updates. The tape changer works great but the mISDN drivers got confused because the 'loading drivers' stage at boot loads them without the right parameters which results in confused drivers (hardware not found) which I can't unload because that causes a kernel panic. Workaround: remove the mISDN drivers, reboot the system, reinstall the mISDN drivers and let /etc/init.d/mISDN load the drivers in the correct way.

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2009-07-12 (#) 10 years ago
Logo omroep brabant I caught the Omroep Brabant logo last night: after dark reception is a lot better! The Digitenne B1 bouquet at 546 MHz and Digitenne B2 at 786 Mhz scanned fine.

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2009-07-10 (#) 10 years ago
I took some pictures of the log-periodical antenna which improved the reception of dvb-t stations in the area and updated the DVB experiments page with them. A big thankyou to Alan Yates for doing the calculations for the UHF log-periodic antenna which has been built by several other hobbyists.

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2009-07-08 (#) 10 years ago
Het artikel Regering dreigt digitale (ether)televisiemarkt te verstikken van David de Jong geeft aardig weer wat er mis is met de televisiemarkt in Nederland. Ik heb er zelf mijn commentaar nog aan toegevoegd dat ik veel meer zie in mogelijkheden voor free-to-air lokale omroepen via dvb-t dan voor dvb-h (mobiel TV) wat eigenlijk voor een deel een kopie is van wat er al via dvb-t gedistribueerd wordt. Ja, Nederland is een land met heel veel buren die ook iets willen en heeft dus maar heel beperkte frequentieruimte. Maar dat alleen maar gebruiken voor mobiele telefonie is jammer.

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2009-07-08 (#) 10 years ago
Het is een regenachtige dag vandaag, maar de neerslagradar van het KNMI heeft momenteel geen data, en buienradar.nl is maar naar de backup-methode overgeschakeld, zo te zien duitse radar. Op de webcam zijn de buien te zien die voorbij trekken.

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2009-07-06 (#) 10 years ago
Afgelopen weekend zijn we op Cycle Vision 2009 geweest. Een evenement van de Nederlandse Vereniging voor Human Powered Vehicles. Ik ging daar vooral heen om te fotograferen. Een internationaal gezelschap van ligfietsers die in diverse evenementen competitie streden leek me wel kans te geven op mooie plaatjes. Na een selectie uit de overvloed die op de geheugenkaarten stond: Cycle Vision 2009 Tilburg.
Ik ben zelf erg tevreden over deze: handbike tijdens uursrace Cycle Vision 2009 Tilburg

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2009-07-03 (#) 10 years ago
Nice sample in the spam of what is in Dutch called acquisitiefraude (aquisition fraud?). Trying to make companies pay for being in some 'register' where nobody looks. From the spam e-mail:
In order to have your company inserted into the registry of World Company Directory for 2009/2010, please print, complete and return the enclosed form (PDF file) to the following address:
With the detail:
Updating is free of charge!
Well, updating may be free, insertion isn't when reading the small print in the PDF:
I HEREBY ORDER A SUBSCRIPTION WITH SERVICE PROVIDER WORLD BUSINESS DIRECTORY LTD. I WILL HAVE AN ENTRY INTO ITS DATABASE FOR THREE YEARS. THE PRICE PER YEAR IS EUR 980.
Spammers and frauds nicely working together, not a surprise.

"World Company Directory" melding bij steunpunt acquisitiefraude


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2009-07-02 (#) 10 years ago
omroep flevoland logo The log-periodical antenna has effect: a number of signals show workable data in w_scan. New:
490 MHz - Digitenne B3 from probably Lelystad
514 MHz - Digitenne B1 from Lelystad, including TV Flevoland / Radio Flevoland
682 MHz - Digitenne B4 from Lelystad
And with aiming and trying (3 windows with dvbsnoop for pid 0x00, 0x10 and 0x11, one window with tzap reading the signal strength):
546 MHz - Digitenne B1 including Omroep Brabant, source unknown
Updated the DVB experiments page with the latest findings. Time to take pictures of the antenna I built.

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2009-07-02 (#) 10 years ago
So, who is this nobody user anyway? Porting account-management scripts from Centos linux to ubuntu made strange problems show. A short check found interesting differences. After asking around on irc and trying some things I found quite a choice:
Centos linux:
nobody:x:99:99:Nobody:/:/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
Ubuntu linux:
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh
FreeBSD 6.1:
nobody:*:65534:65534:Unprivileged user:/nonexistent:/usr/sbin/nologin
Solaris:
nobody:x:60001:60001:Nobody:/:
Interesting is that creating a file as root on a solaris nfs client will create it as 65534:0. Data Ontap:
pw_name = nobody
pw_passwd = 
pw_uid = 65535, pw_gid = 65535

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2009-07-02 (#) 10 years ago
First success with the self-built antenna: I tried it in the 'home office', approximately 5 meters above ground, north-east direction. With the log-periodical antenna pointing outside through the window I was able to receive Digitenne bouquet 1 at 618 MHz UHF, which includes radio and TV Noord-Holland.

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2009-07-01 (#) 10 years ago
A spammer on the block named Facebook. And I'm not talking about spamming in facebook, I'm talking about spam from facebook in my mailbox, disguised as an 'invitation'. From the e-mail:
I set up a Facebook profile where I can post my pictures, videos and events and I want to add you as a friend so you can see it. First, you need to join Facebook! Once you join, you can also create your own profile.

PREMIER SITE DE RENCONTRE 100% GRATUIT. chat,envoie de mails,inscription,photos, envoie de vos coordonnées personnel aux autres membres .......tous les services sont GRATUITS sur notre site de rencontre

Some French-language website (on facebook? redirecting somewhere else? I have to register with facebook to find out: no way). And, at the bottom:
******@ruu.nl was invited to join Facebook by Azza Ava. If you do not wish to receive this type of email from Facebook in the future, please click on the link below to unsubscribe.
That e-mail address points at a role-account here (and given the fact that the @ruu.nl version is used means a really old spammer list is used too). So it has never been subscribed to anything from Facebook. No need to unsubscribe, this is pure spam. According to whois for the sender-IP:
NetRange:   69.63.176.0 - 69.63.191.255 
CIDR:       69.63.176.0/20 
OriginAS:   AS32934
NetName:    TFBNET2
NetHandle:  NET-69-63-176-0-1
Parent:     NET-69-0-0-0-0
NetType:    Direct Assignment
NameServer: DNS04.SF2P.TFBNW.NET
NameServer: DNS05.SF2P.TFBNW.NET
Comment:    Contact abuse@facebook.com with issues.
RegDate:    2007-02-07
Updated:    2009-03-04
I am not fully convinced their abuse department is going to change their system not to annoy random e-mail accounts with invitation-spam. Time to notify uplink providers too that there is a spammer in the house.
Update: the nice autoreply from abuse at facebook tells me all about privacy on facebook and stuff like that. Bzzzzt, wrong answer! I'm from the non-facebook world and I don't want your invitations. I'll discuss this with your uplink providers. They have the wire-cutters to really deal with the problem.
Update^2: According to the facebook abuse department the mail was faked and not really from facebook. I disagree: the headers show an outgoing facebook mail server.

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

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Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
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