News archive November 2013 - Koos van den Hout

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2013-11-28 (#) 6 years ago
Vreemde ADSL uitval vandaag:

09:37 verbinding verbroken

Alle opties geprobeerd, ander modem, modem direct op het isra punt. Verbinding blijft "Modemstate : DOWN ( Line in Initializing mode )".

14:27 Helpdesk xs4all gebeld en daar de storing gemeld. Keurig geholpen, ze willen wat metingen doen en dan is het wel duidelijk dat de storing ergens in het KPN deel zit. Ze gaan een storing aanmelden bij KPN en die gaat contact opnemen.

14:31 SMS van xs4all met ticketnummer.

14:51 verbinding wordt weer opgebouwd. Maar nog niets van KPN.

Update 2013-11-29: In de loop van de ochtend belt xs4all nog eens terug. Of het allemaal weer werkt (ja, prima). En ze hebben niet echt duidelijk terug van KPN wat er nu mis was.

Update 2013-12-15: Ik sprak vandaag een buurman: die heeft ongeveer 6 weken aan storingen aan de telefoonlijn achter de rug door een onweersbui begin november. Die onweersbui zie ik ook terug op weerstation Utrecht Overvecht. Overal in de omgeving hebben mensen storingen gehad aan telefonie en kabel. Ben ik toch blij dat ik in 2010 surge protection heb toegevoegd op de adsl lijn.

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2013-11-22 (#) 6 years ago
Good advice from Brian Krebs: Don’t Like Spam? Complain About It. - krebs on security.

I complain. And I complain a lot more about spam sources than I mention here on my homepage. And indeed spamcop is one of the ways I complain. Direct complaints to providers do have the chance of ending at the spammer with my name/e-mail address still on them resulting in retaliation attempts.

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2013-11-20 (#) 6 years ago
To my shame as a radio amateur I must admit I still use a PLC (ethernet over powerline) connection in my home network. It's what makes the shed weather station computer reachable. An upgrade to wifi is in the plans.
gqrx display around the 20 meter amateur band with PLC network idle
gqrx receiving radio signal around the 20 meter amateur band with the PLC network idle.
This evening I played a bit with it and caused heavy traffic on that bit of network using iperf and the results in gqrx are stunning. Around the 20 meter amateur band (14000-14350 kHz) the difference is quite visible. The band itself is clearly notched, but a serious amount of radio noise is visible outside the band.
gqrx display around the 20 meter band with the PLC network loaded with heavy traffic
gqrx receiving radio signal around the 20 meter band with the PLC network loaded with heavy traffic

The gqrx displays are the current signal levels across the frequency spectrum in the top half of the display and a waterfall display in the bottom half. The waterfall display shows the history of those levels as indexed colors.

The upside: these PLC adapters (devolo) clearly use notching. Interference on amateur bands is small. But I don't receive any other amateur radio signals either so I still have a problem.

The downside: outside the amateur bands the interference is quite strong. Weak signals do not survive this.

Update 2014-08-17: Sometimes you notice something after a while: the horizontal lines in the 'idle' and 'busy' graphs are very short bursts that sound like ticking when heard on a radio. These are quite probably the way in which the powerline network tests the connectivity and available frequency spectrum including noise levels.

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2013-11-20 (#) 6 years ago
Trying the mini-whip antenna in a different corner of the house on the AM MW broadcast band. Some interesting new stations:
621 kHz RTBF International 154km
693 kHz BBC Radio 5 Live 494km
711 kHz France Info 667km
738 kHz RNE Radio Nacional 1191km
810 kHz BBC Radio Scotland 726km
855 kHz RNE Radio Nacional 1147km
864 kHz France Blue 430km
918 kHz Radio Slovenija 1 954km
945 kHz France Info 1001km
954 kHz ČRo Plus 574-894km
1107 kHz TalkSport 381km
1134 kHz HRT-HR 1 1149km
1215 kHz Absolute radio 494km / Voice of Russia 1137km
1269 kHz Deutschlandfunk 383km
1341 kHz BBC Radio Ulster 790km
This time Radio Vahon clearly on 1557 kHz. 1215 kHz was harder to determine but I clearly heard both stations!

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2013-11-20 (#) 6 years ago
Stevige stroomstoring vandaag. Dus de ADSL verbinding werd ook compleet verbroken en opnieuw opgebouwd. De waardes zijn nu weer anders:
=>:adsl info
Modemstate            :  up 
Operation Mode        :  G.992.5 Annex B
Channel Mode          :  interleaved 
Number of resets      :  1 

Vendor                              Local           Remote   
  Country             :               0f               b5 
  Vendor              :             TMMB             BDCM 
  VendorSpecific      :             0000             ff91 
  StandardRevisionNr  :               00               02 

                                  Downstream        Upstream 
Margin       [dB]     :              4.0             10.0 
Attenuation  [dB]     :             21.0             11.5 
OutputPower  [dBm]    :             20.5             12.5 

Available Bandwidth                 Cells/s           Kbit/s 
  Downstream          :            40143            17021 
  Upstream            :             2429             1030 
Ik dacht dat de minimale margins 6.0 dB waren maar blijkbaar kan het ook werken met 4.0 dB zonder hele hoge aantallen fouten.

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2013-11-19 (Oooo... I wonder what's going to happen with EU customers now... http://doctorbeet.blogspot.co.uk/...) 6 years ago
Google+Koos van den Hout : So LG Smart TVs watch back. Just like the Philips Smart TVs did earlier (and got found out).
2013-11-19 (So, digging in my street this morning.. but no fiber to my home. Just some work replacing aged gas pipes...) 6 years ago
Google+Koos van den Hout : So, digging in my street this morning.. but no fiber to my home. Just some work replacing aged gas pipes.
#FTTH
2013-11-19 (#) 6 years ago
Interesting DNS problem:
hout0101@monitoring:~$ getent hosts fg.geo.uu.nl
131.211.64.24   fg.geo.uu.nl
hout0101@monitoring:~$ telnet fg.geo.uu.nl 80
telnet: fg.geo.uu.nl: Name or service not known
fg.geo.uu.nl: Unknown host
Found out after serious searching that this was caused by the /etc/resolv.conf line:
options rotate
Of the 3 available nameservers, numbers 2 and 3 decided to negatively cache fg.geo.uu.nl for good reasons earlier. Options rotate counts per program which means the impact isn't that big for short-lived programs. I guess telnet does a query before querying the nameserver for the needed address to connect to.

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2013-11-18 (Just watched the "Business part" of this episode of HamRadioNow and I noticed N4SCY Ozzie Osband looks...) 6 years ago
Google+Koos van den Hout : Just watched the "Business part" of this episode of HamRadioNow and I noticed N4SCY Ozzie Osband looks somewhat familiar. Isn't that the Cheshire Catalyst I saw in The BBS Documentary.. some searches later (the Cheshire Catalyst uses a few names) it's confirmed (mostly via the area code 321 story): one and the same person.
Funny how I keep finding radio amateurs in all sorts of connected ways.
Nice episode +Gary Pearce!
2013-11-18 (#) 6 years ago
I&O auctions is niet te beroerd om e-mail adressen te schrapen van websites en dan net te doen of die adressen legitiem ingeschreven zijn voor hun mailing list. Regel 1 blijft duidelijk van toepassing: spammers liegen. En als ik een beetje zoek kom ik al gelijk dingen tegen als 84.199.79.140 IP address harvester for I&O auctions io-auctions.com en 81.82.226.81 IP address harvester for I&O auctions io-auctions.com. Dus ik ben niet de enige die die rommel gezien heeft.

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2013-11-17 En de DAB zender Mierlo mag weer aan 6 years ago
En minder dan een jaar na het uitschakelen van de DAB zender in Mierlo staat het alweer in de planning om deze in te schakelen.

Via Radio TV Nederland

Update 2013-11-18 volgens NPO zet vanaf komende week nieuwe DAB+ radiozenders aan - Dabtuners.nl is het weer inschakelen van Mierlo tijdelijk tot de zender in Eindhoven aan gaat.

Volgens mij verdient de NPO geen schoonheidsprijs met deze aanpak en met de communicatie erover.

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2013-11-17 (#) 6 years ago
Das Keyboard with ferrite core to reduce interference In disassembling a very old original Apple external CD player I came across a big ferrite core. I thought this would help solve the problem with 2 meter band interference from the Das Keyboard. And indeed, there is a lot less interference on the 2 meter amateur band. I tested with the Wouxun KG-UVD1P radio tuned to 145.500 MHz and I had to put the antenna of the radio real close to the keyboard to hear interference with the squelch set at 5.

Update: I notified the makers of Das Keyboard of this problem and my solution. The reply was a bit non-committal they will forward the suggestion to development.

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2013-11-17 (#) 6 years ago
Soon, ns3.idefix.net will be going away so I am working on changing the nameservers. My domains are registered through EPAG and they do offer secondary DNS service, but debugging it is a bit hard and the only way I know something is wrong is when the nameservers reply with failures. What is wrong is invisible and at the same time my domains are harder to resolve.

The theory is that when you want secondary nameservices with a visible primary nameserver you add that server as the first and the epag nameservers further in the record. First I had the problem that when I entered the nameservers
ns2.idefix.net
ns2.pir.net
dns1.epag.net
dns2.epag.net
In that order as nameservers, the epag system changes the order to:
ns2.pir.net
ns2.idefix.net
dns1.epag.net
dns2.epag.net
which in theory would try the zonetransfers from ns2.pir.net which is controlled by someone else who is probably now wondering where all the zonetransfer attempts are coming from.

I fixed the ordering problem by first submitting as nameservers
ns2.idefix.net
dns1.epag.net
dns2.epag.net
And then re-adding ns2.pir.net as the last.

But still there are problems with the nameservice. For idefix.net I entered the IP of ns2.idefix.net as 'hidden primary' in the hope of getting things right. The result at the moment is:
$ host -t soa idefix.net dns1.epag.net
Using domain server:
Name: dns1.epag.net
Address: 212.123.35.78#53
Aliases:

idefix.net has SOA record dns1.epag.net. postmaster.epag.net. 0 86400 1800
604800 180

$ host -t soa idefix.net dns1.epag.net
Using domain server:
Name: dns1.epag.net
Address: 217.76.102.142#53
Aliases:

idefix.net has SOA record ns2.idefix.net. koos.idefix.net. 2013111700 10800
1800 2419200 43200
(note the 2 different IPs for dns1.epag.net)
$ host -t soa idefix.net dns2.epag.net
Using domain server:
Name: dns2.epag.net
Address: 212.123.32.78#53
Aliases:

idefix.net has SOA record dns1.epag.net. postmaster.epag.net. 0 86400 1800
604800 180
So of the 5 nameservers for idefix.net (dns1.epag.net has 2 IPs) 2 are returning errors.

Update 2013-11-18: And I'm getting the kind of errors I really do not want to see:
$ host koos.idefix.net
Host koos.idefix.net not found: 3(NXDOMAIN)
And for other domains it doesn't work as well as it should either. Part of the EPAG nameservers have a problem with AAAA records.
$ host -t aaaa camp-wireless.com
camp-wireless.com has no AAAA record
$ host -t aaaa camp-wireless.com dns2.epag.net
Using domain server:
Name: dns2.epag.net
Address: 212.123.32.78#53
Aliases: 

camp-wireless.com has no AAAA record
$ host -t aaaa camp-wireless.com dns1.epag.net
Using domain server:
Name: dns1.epag.net
Address: 212.123.35.78#53
Aliases: 

camp-wireless.com has no AAAA record
Which is wrong:
$ host -t aaaa camp-wireless.com ns2.idefix.net
Using domain server:
Name: ns2.idefix.net
Address: 2001:980:14ca:42::694#53
Aliases: 

camp-wireless.com has IPv6 address 2001:980:14ca:42::694
For the important domains back to ns3.idefix.net and looking for a better secondary DNS solution.

Update 2013-11-19: So now ns3.idefix.net points at a different server and everything is back to working order again.

Update 2013-11-25: Answer from epag: the setup I wanted isn't supported. Either one nameserver of your own (hidden or published) and the epag nameservers or you provide all nameservers.

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2013-11-15 (#) 6 years ago
Interesting dipole design: Ham Radio 2m/70cm Vertical Dipole Antenna - Dave Tadlock on YouTube found via Zelfbouw 2m/70cm dipooltje - zendamateur.com and De 10 euro dual bander (2/70 cm) professional look - zendamateur.com.

This could be an interesting future 'under the roof' antenna.

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2013-11-13 (#) 6 years ago
Trying the AM broadcast band with the mini-whip antenna, HF upconvertor and the rtl-sdr stick with gqrx software. Reasonable reception of:
675 kHz Radio Maria 11km
747 kHz NPO Radio 5 38km
792 kHz France Info 742km
837 kHz France Info 364km
882 kHz BBC Radio Wales 594km
909 kHz BBC Radio 5 live 366km
1008 kHz Groot Nieuws Radio 38km
1053 kHz Talksport 494km
1089 kHz Talksport 366km
1377 kHz France Info 229km
1422 kHz Deutschlandfunk 329km
1440 kHz China radio international 236km
1458 kHz BBC Asian network 472km
1584 kHz Radio Paradijs 1km
Stations were fading and I 'cheated' by looking at the AM reception prediction at fmscan.org to confirm languages and service names where I also got the distances from.

I am trying to find out what I hear on 1557 kHz which can be either Vahon Hindustani Radio from 49km away or France Info from 937km away. There was a very interesting article about the transmitter setup for Vahon in the Electron magazine of the Veron radio amateur club. Constant fading makes it hard to understand but at one moment I heard music which I also heard on the livestream from Vahon and at another moment I heard speech in French.

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2013-11-11 (#) 6 years ago
Interesting things in the sshd logs lately:
Nov  8 05:46:31 system sshd[xxxx]: Invalid user trash from 176.31.72.71
Nov  8 07:48:06 system sshd[xxxx]: Invalid user trash from 12.35.78.40
Nov  8 08:15:05 system sshd[xxxx]: Invalid user trash from 62.149.196.28
Nov  8 11:23:16 system sshd[xxxx]: Invalid user trash from 216.58.130.126
Nov  8 11:24:07 system sshd[xxxx]: Invalid user trash from 216.58.130.126
Nov  8 11:50:00 system sshd[xxxx]: Invalid user trash from 109.196.34.51
Nov  8 11:54:06 system sshd[xxxx]: Invalid user trash from 89.142.199.126
Nov  8 11:56:21 system sshd[xxxx]: Invalid user trash from 216.58.130.126
Nov  8 13:10:07 system sshd[xxxx]: Invalid user trash from 216.58.130.126
Seems distributed scanning, all trying different passwords for the same username. Or
Nov  6 02:57:50 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 03:31:15 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 04:04:44 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 04:38:11 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 05:11:48 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 05:45:41 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 06:19:31 system sshd[xxxx]: Invalid user apache from 115.114.14.195
Nov  6 06:53:24 system sshd[xxxx]: Invalid user apache from 115.114.14.195
And lots of other usernames beginning with a letter 'a' from 115.114.14.195.

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2013-11-08 (#) 6 years ago
An interesting bit of cold war history: when the British army had a large number of people stationed in Germany a TV station was set up, BFBS Television which still runs in areas where the British army is active. Back in the 1980s satellite home distribution wasn't an option so first videotapes where sent from the London studios to the German transmission center(s) where they were transmitted to the families using low-power local UHF tv transmitters. 'Current affairs' programs such as the news were only delayed by about a week, less urgent programming could be delayed by up to 6 weeks.

In 1983 a microwave link England - France - Belgium - The Netherlands - Germany made live transmissions possible from London, a major and costly upgrade.

The first live transmissions were the ITN and BBC evening news programs both of which mentioned their new audience.

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2013-11-07 (#) 6 years ago
Ik ben er nog even aan toegekomen om de ADSL splitter te verwijderen (niet meer nodig sinds we VoIP gebruiken) met het idee dat er dan minder onderdelen zijn die storing kunnen veroorzaken, dus misschien iets meer ADSL snelheid en marge. Geen spectaculaire wijziging, de snelheid is van 16700 kbit downstream en 1029 kilobit upstream naar 16737 kbit downstream en 1027 kilobit upstream gegaan.
=>:adsl info
Modemstate            :  up 
Operation Mode        :  G.992.5 Annex B
Channel Mode          :  interleaved 
Number of resets      :  52 

Vendor                              Local           Remote   
  Country             :               0f               b5 
  Vendor              :             TMMB             BDCM 
  VendorSpecific      :             0000             ff91 
  StandardRevisionNr  :               00               02 

                                  Downstream        Upstream 
Margin       [dB]     :              6.5             10.5 
Attenuation  [dB]     :             21.0             11.5 
OutputPower  [dBm]    :             20.5             12.5 

Available Bandwidth                 Cells/s           Kbit/s 
  Downstream          :            39474            16737 
  Upstream            :             2422             1027 

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2013-11-06 (Indian APRS balloon makes a serious flight and was recovered. But I go 'hmm' at the description of the...) 6 years ago
Google+Koos van den Hout : Indian APRS balloon makes a serious flight and was recovered. But I go 'hmm' at the description of the recovery:
""It was only possible to trace the payload because one of the sailors used the sim card that was in one of the pieces of equipment in the payload""
Sounds to me like the sailor was interested in the free calls but the sim card was set to 'phone home'.
2013-11-05 (#) 6 years ago
Vandaag met een wat langere/betere antenne geprobeerd over repeater PI2NOS heen te komen. Geen echt succes, de andere partij meldde zoveel ruis en flutter dat het niet echt verstaanbaar. Ik wil graag verbindingen kunnen maken vanaf de ligfiets, maar het blijft lastig. Nu was een extra factor dat het regende waardoor mijn natte regenjas vast nog meer demping veroorzaakte. Daarnaast hangt de 4W (UHF) portofoon aan de riem ook maar ongeveer 1 meter boven het aardoppervlak en niet altijd even netjes vertikaal.

Update 2013-11-06: Ondertussen er eens aan gerekend met Radio Mobile Online. Dat is de online versie van 'Radio Mobile', software om radio dekking en verbindings planning te doen. Daar komt er uit dat in theorie ik prima binnen zou moeten komen op PI2NOS. Maar ik heb het idee dat de 'landcover' data niet compleet is, ik zie op de verbinding tussen ons huis en PI3UTR niet dat er wat hoge gebouwen dichtbij ons huis staan die zeker problemen geven.

Erg leuk om aan dekking te rekenen hiermee, maar ik zou het nog leuker vinden als het werkte!

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2013-11-05 (#) 6 years ago
I heard today about Windows 2012 R2 "desired state configuration" which made me think a bit of puppet. The general idea is to get systems configured to a desired state with whichever changes are needed to get to that state. Desired State Configuration in Windows Server 2012 R2 PowerShell - YouTube for a presentation.

But when I see a bit of configuration sample in the above video it makes me think a lot of puppet:
Configuration FourthCoffeeWebsite
{
	Node ("WebServer1","WebServer2")
	{
		# Install the IIS role
		WindowsFeature IIS
		{
			Ensure  = "Present"
			Name    = "Web-Server"
		}
		
		# Install the ASP .NET 4.5 role
		WindowsFeature AspNet45
		{
			Ensure  = "Present"
			Name	= "Web-Server"
		}
	}
}
Funny how system administration in the Windows and Linux/Unix world is converging. Just like Windows PowerShell makes me think of scripting languages and the unix commandline.

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2013-11-04 (#) 6 years ago
De overgang naar een ander foutcorrectie niveau bij de omschakeling van DAB naar DAB+ bij de NPO levert diverse reacties/vragen op. Ik heb het dus maar eens uitgezocht, want ik raakte zelf ook meer benieuwd.

EEP staat voor 'Equal Error Protection', waarbij alle onderdelen (metadata, audio, additional data) van het programma evenveel foutcorrectie krijgen. De genoemde code rates zijn de verhoudingen tussen de hoeveelheid data die netto overgebracht wordt tussen de eindpunten versus de hoeveelheid data die daarvoor verzonden worden over de drager.

De mogelijke levels zijn:
Protection level               1-A  2-A  3-A  4-A
Convolutional coding rate      1/4  3/8  1/2  3/4
Protection level               1-B  2-B  3-B  4-B
Convolutional coding rate      4/9  4/7  4/6  4/5
Bij 3-A, code rate 1/2 betekent het dus dat er voor een byte nuttige informatie er 2 bytes door de lucht gaan, waardoor dus maximaal 50% fouten gecorrigeerd kunnen worden. Bij 3-B, code rate 4/6 betekent het dat er voor 4 bytes nuttige informatie er 6 bytes door de lucht gaan, waardoor er dus maximaal 33% fouten gecorrigeerd kunnen worden.

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2013-11-04 (#) 6 years ago
Opvallende opening in How To Avoid CryptoLocker Ransomware - Krebs on security (engelstalig):
Over the past several weeks, a handful of frantic Microsoft Windows users have written in to ask what they might do to recover from PC infections from “CryptoLocker,” the generic name for an increasingly prevalent and nasty strain of malicious software that encrypts your files until you pay a ransom.
Over het verschijnsel ransomware (en specifiek de nieuwste variant waarbij ook echt kinderporno op de computer van het slachtoffer gezet wordt) stonden ook wat artikelen in de Volkskrant recent: Computervirus dat kinderporno toont duikt op - volkskrant waarin de termen 'Microsoft' en 'Windows' totaal niet voorkwamen. Een opvallend verschil.

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2013-11-01 (#) 6 years ago
Soms gebruik ik toch de auto in mijn eentje om ergens te komen, en dan is het wel leuk om de porto mee te nemen. In de auto is de radio ontvangst natuurlijk waardeloos, maar ik heb nu een raamantenne. Deze zorgt dat een whipantenne buiten de auto zit en geeft onderweg goeie communicatie met repeaters. Ik heb contact gehad met PI3UTR en PI2NOS.
PD4KH mobiel, raamantenne op auto
PD4KH mobiel, raamantenne op de auto

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2013-11-01 (#) 6 years ago
In the UK the first tests are done with contactless payments based on RFID. According to the specifications eavesdropping on the transaction signals should not be possible from further than 10 centimeters. And predictably radio signals don't follow specifications: At a distance of 45 centimeter the data was received using equipment which could be hid in a backpack in a shopping trolley.

Via Contactless cards: data intercepted - Southgate Amateur Radio News

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2013-11-01 (Here's an RFI story you don't see every day:) 6 years ago
Google+Koos van den Hout : Radio Frequency Interference (RFI) is a real problem, not just affecting some radio amateurs who want to receive weak signals on HF bands. Good story and the radio amateur saves the day.
2013-11-01 (Scariest Halloween Pumpkin EVER!!!) 6 years ago
Google+Koos van den Hout : Very scary! Happy all hallows' eve!


, 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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