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Koos van den Hout

Koos van den Hout - Latest news, thoughts, rants, projects and other things to write about.
2020-09-22 TLSA records for DANE can't have it all 14 hours ago
Yesterday I read about changes at LetsEncrypt that influence LetsEncrypt intermediate certificates and DANE and had a look at my own DANE record set up in december 2019.

I decided to change the 'usage' value to 1, meaning 'EE match validated by public CA' because it's linked to a known public CA, and the old value 3 meaning 'private EE' wasn't completely true because it's linked to a known public CA.

But I received a notification this morning, with:
Only certificate usages DANE-TA(2) and DANE-EE(3) are supported with SMTP.
With references to rfc 7672 section 3.1.1 and further which makes a valid point about CA validation in SMTP sessions.

So the validation chain is purely based on DNSSEC.

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2020-09-16 My amateur radio activity versus the sunspot cycle 6 days ago
PD4KH start on HF bands versus the sunspot cycle
My start on the HF bands versus the sunspot cycle. Click for full graph with legend.
Recently the start of the new sunspot cycle is mentioned a lot in radio amateur news because the influence on ionospheric propagation is strong and the start of counted sunspot cycle 25 has started. Looking at the graphs I felt like I started just at the downward trend of the previous sunspot cycle.

So I looked it up at Solar Cycle Progression - NOAA / NWS Space Weather Prediction Center and zoomed in to the time when I made my first contacts making the screenshot in this article. And indeed, August / September 2014 was part of the last peaks of cycle 24, and it went mostly downhill from there. So my experience that I made my first HF contacts on 10 meter and soon had to go to lower frequencies to get any propagation matches those measurements.

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2020-09-15 VDSL hikt als ik actief ben op de radio binnen het VDSL spectrum, maar ook er na 1 week ago
Dit weekend was ik weer eens behoorlijk actief met amateurradio en als ik ging zenden was dit eigenlijk iedere keer onder de 17 MHz, dus binnen het VDSL spectrum. Ik was actief net boven 14 MHz (20 meter band) en net boven 7 MHz (40 meter band). Iedere keer als ik naar een andere frequentie ging verbrak de VDSL de verbinding en moest die opnieuw opgebouwd worden, ook als ik binnen dezelfde band opschoof. Ook waren er in de nachten nadat ik actief geweest was nog onderbrekingen.

Dit keer ook opvallend: het 'geheugen' van de VDSL verbinding is veel korter. Een avond later kreeg ik weer een onderbreking als ik op dezelfde frequenties actief werd, ik was gewend dat dat bij meer dan een week was.

Al met al is de VDSL dus een stuk gevoeliger voor het soort storingen wat amateurradio veroorzaakt (korte storingen op wisselende frequenties). Ik dacht dat dat in DSL termen "impulse noise". Nu begrijp ik ook dat de firmware met 'optimized for KPN' modem driver die ik nu gebruik anders reageert op dit punt dan de versie die ik gebruikte voordat er problemen met rare verbroken verbindingen kwamen. Geen vooruitgang dus. Wanneer komt er glasvezel naar de huizen? Glasvezel veroorzaakt geen storing op radiofrequenties en het raakt niet verstoort van nabij radiogebruik.

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2020-09-13 A weekend with some radio: first hand-paddled morse contact, a new country and data contacts 1 week ago
After lots of other things a weekend where I made time for amateur radio. I set up the endfed antenna and used a mast to raise the antenna at the end of the garden a bit, which hopefully increases the range a bit.

The big new thing was the last radio contact of the weekend: I decided to get on the air with the paddle as an exercise in morse. After looking for a contact at a reasonable speed where the exchange would be more than just callsigns and signal report I heard someone call CQ on the 40 meter band at about 20 words per minute. So to exercise my sending and not try to decode everything at 20 words per minute I cheated and used the computer to decode most of the morse code. I answered with my call and some basic information, with the printed CW QSO example in front of me. The other radio amateur had the patience to listen to my relatively slow speed (12 words per minute) and I had the contact. So I ended with a good - ..- which is morse for TU which is the abbreviation for "Thank You!"

Earlier in the weekend I made lots of FT8 and some FT4 contacts, just getting more calls in the log. I saw some for me new countries active. I managed to get French Guadeloupe as a new country in the log, and Saint Julia on a new band.

My notifications for the Bulgarian Saints showed me that LZ595IP was active in PSK31. I haven't used that mode in a while. I made the contact, so now I have that call in morse and PSK31, still looking for other modes.

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2020-09-09 Romantiek, gevaar en lust: de Curry en van Inkel podcast 1 week ago
Ze zijn er weer! Ruim 15 jaar nadat ik met vertraging ontdekte dat Adam Curry aan podcasting was begonnen is ook Jeroen van Inkel begonnen met een podcast, en gelijk over het onderwerp waar ik graag dingen over terugluister: Curry en Van Inkel, het radioprogramma wat ik elke vrijdagavond wilde horen in 1984-1987.

Ook nu weer met vertraging, want deze podcast loopt al sinds november 2019. Maar dat maakt de lol niet minder! Het is echt weer genieten van de oude jingles, stukken 'aircheck' (opnames die gemaakt werden van de gehele uitzending zoals die er uit ging), gesprekken met mensen die er bij waren, anecdotes en stukjes van de muziek zoals die toen was (geen lange stukken, want de muziekrechten blijven een ding).

De lol die ik er toen in had om er naar te luisteren komt ook gelijk weer terug. Waarbij ik ook sommige dingen ontdek die ik in die jaren gemist heb, wat dan te maken heeft met de ondertussen iets meer gevorderde leeftijd.

Het mooie is dat het me uit de eerste aflevering duidelijk wordt dat al het archiefmateriaal wat in de podcast gebruikt wordt beschikbaar is in digitale en doorzoekbare vorm omdat een enorme fan de hele voorraad met audiocassettes heeft gekregen van Jeroen, en een jaar later was er een gedigitaliseerd archief.

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2020-09-02 An update to the home 1-wire network 2 weeks ago
For more than 12 years now(!) the house has temperature sensors using the 1-wire protocol. I recently redid some of the wiring between floors and I finally got around to rerouting the 1-wire network via this new route.

I also added a temperature sensor in the big room in the attic, we are thinking of using that room more often. To get an idea of how good that idea is we wanted to get an idea of the temperatures up there and that's what I have 1-wire sensors for! I soldered an 18b20 sensor to the end of a 4-wire flat phone cable, added it to the network and it's measuring.

So now 12 environmental temperatures are measured every 5 minutes: 9 in the house, one in the weather hut, one in the shed and one on the roof of the shed.

I also updated the 1-wire projects overview with how I use 4-wire flat phone cable in RJ45 connectors for 1-wire network. I had to look up how I did that previously before I could start adding new cables!

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2020-08-31 Adding static IPv4 routes for devices that still need those 3 weeks ago
I decided to have a look whether I can set up the static routes like those needed to get ads-b data out to plane finder via the dhcp server. This works a lot better than having to set those routes by hand after a reboot.

This can be done with the rfc3442 classless static routes extension in DHCP, which isn't supported out of the box by isc dhcpd. But there is support in the dhclient configuration on raspbian, so I only had to add the server side.

All the samples I could find for adding this to the server side added arrays of bytes which is harder to read/comprehend. I had a look at the dhcp-options manpage which showed the option to add a structured record with IPv4 addresses.

Main configuration adding the option:
option rfc3442-classless-static-routes code 121 = array of { integer 8, ip-address, ip-address };
# netmask bit count, destination, via
Specific host configuration using the option with the current address for pfclient-upload.planefinder.net. Which may change!
        host joy {
            hardware ethernet b8:27:eb:ae:ad:47;
            option rfc3442-classless-static-routes 32 80.84.58.2 10.42.2.1;
        }
This pushes route to 80.84.58.2/32 via 10.42.2.1.

Hosts that get this option via dhcp should ignore the default router option so if you need that too you will need to add a route for 0.0.0.0/0. In my specific usecase I don't want to set a default IPv4 route.

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2020-08-28 Vandaag een stuk gaan fietsen maar het viel tegen 3 weeks ago
Dankzij het thuiswerken de laatste maanden viel mijn conditie recent toch flink tegen. Omdat ik voor de toekomst wilde plannen heb om door Europa te gaan ligfietsen vond ik het een goed idee om eens een stuk te gaan ligfietsen vandaag. De tijd was wat beperkt dus ik had al een plan gemaakt waar heen te gaan (een keer naar het Oosten) met diverse mogelijkheden om terug te keren als de tijdlimiet er aan kwam.

Maar ik had er niet op gerekend dat ik onderweg meerdere regenbuien mee zou krijgen en ook nog door een beweging mezelf zou openhalen aan een scherp deel van de fiets. Toen leek het me toch een goed idee om terug te gaan rijden maar dat ging uiteindelijk weer vlotter dan gedacht. Hier en daar is de keuze in routes soms wat beperkt. Uiteindelijk toch relatief veel 'bekend terrein' en minder ver gekomen dan ik verwacht had. De resultaten vielen ook een beetje tegen: 23.81 kilometer gefietst met uiteindelijk gemiddeld 13.90 kilometer per uur (inclusief schuilen voor de regen). Als ik serieuze afstanden wil afleggen in een langere fietstocht moet er toch meer uitkomen.

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2020-08-25 A new Camp Wireless that looks the same 4 weeks ago
The new Camp Wireless that looks almost the same, but is completely rewritten is on-line.

It should look and work better on mobile devices. According to the statistics about half of the visitors is using a mobile device, so that is an important part.

I am a great fan of not breaking existing links, so they will keep working. There is a change in the url scheme for the site, but all old links redirect to the correct new location.

The details: Camp Wireless was completely written in PHP since the start of Camp Wireless in June 2004. But I didn't update the code a lot over the last years because I wasn't using PHP anymore and doing all my newer webprojects in modperl. This was becoming a risk, I didn't like updating the code anymore. I had to fix several things when I moved from the old homeserver to the new one because the new system came with PHP 7.

Since the url design of Camp Wireless was 'technology neutral' from the start (the main urls do not include .php or other hints to the used technology) it was possible to rewrite it in another language, as long as it could handle all the urls the same way.

I made one change to the url scheme: in the old setup the directory of campsites had urls with /database/region/ and /database/site/. Although there is indeed a database behind the site, the better term to use is directory, so I developed with /directory/region/ and /directory/site/ urls. And wrote a rewrite rule handler to redirect all the old links, because I don't like breaking old links.

I rewrote the site it in modperl. It was hosted on the development webserver and after implementing and testing each function I committed the result to version control. I still use cvs because that's what I once dove into.

After testing for a while with an acceptance version I finally made the switch today. After that I found a few functions missing so I added those promptly. Still using version control, so I know what I changed when and why.
Read the rest of A new Camp Wireless that looks the same

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The person

Father, cat owned/owner, Linux fan, Internet user, book reader, radio amateur, recumbent bicyclist, snowboarder, ipv6 fan. For those who don't speak Dutch: how to pronounce Koos van den Hout.

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Specialist information security at Utrecht University with a modern Profile page.
 

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