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Koos van den Hout

Koos van den Hout - Latest news, thoughts, rants, projects and other things to write about.
2019-04-14 Getting countries on new bands in the log 4 days ago
I haven't made an amateur radio contact with a completely new country in a while, but I have worked on getting countries on new bands in the log. This weekend I had the 6-40m longwire antenna out. It did not want to tune on 12 meters but I made contacts on the 10, 15, 17, 30 and 40 meter bands.

Some new country/band combinations were added: Moldova, Montenegro, Japan and the Slovak Republic on 30 meters, Estonia on 17 meters, Latvia on 15 meters. I also made contacts with several stations in the URE 70 year anniversary special event.

Update 2019-04-15: Tuned the longwire for 80 meters and added Serbia and Norway as new 80 meter countries.

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2019-04-13 Cornet Oaked from De Hoorn Brouwerij 5 days ago
Another find in the local supermarket. This time no complicated backstory, it just looked and sounded nice.

It's a blonde beer. The color is lighter than I expected from a blonde, it's almost like Belgian white beer (Belgisch witbier). It has a higher alcohol level for a beer, but it didn't taste/feel like a strong beer to me.

A nice taste, not too complicated.

The beer details

CompanyDe Hoorn Brouwerij
Beer nameCornet Oaked
Beer styleBlond beer
Alcohol by volume8.5 %

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2019-04-12 Corel spam 1 week ago
It seems Corel graphics still exists and part of their continued existance is sending out spam to unverified e-mail addresses. With the included lie:
You are receiving this email because you requested to receive information regarding Corel products and special offers or you subscribe to a Corel e-newsletter.
No I haven't.

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2019-04-07 Goose IPA from Goose Island Beer company 1 week ago
I had a look at the beer on display in our local supermarket and noticed Goose IPA from Goose Island Beer company and I got reminded of Goose Island, Oregon which is mentioned in the Wargames movie. So I bought a bottle of the beer and did some research when I got home.

And everything about that link turned out to be wrong.

The Goose Island Beer company has nothing to do with Oregon, they are from Chicago, Illinois.

And according to Anderson Island (Washington) - Wikipedia English the scene around entering "Goose Island, Oregon" in the movie WarGames was actually filmed on Anderson Island in the state of Washington. There is a small island named "Goose Island" in the state of Oregon, it's an island in the Columbia river. Goose island measures almost 1000 meters by 680 meters. Goose Island Oregon USA on google maps.

Having left me with nothing of the link(s) I suspected when I saw the bottle there is only one thing to do: try the beer.

I would describe the colour as amber / dark amber. The smell and taste have a strong hop influence. I personally like IPA beers, but this one is a bit too bitter for me.

The beer details

CompanyGoose Island Beer company
Beer nameGoose IPA
Beer styleIPA - India Pale Ale
Alcohol by volume5.9 %

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2019-04-01 Plotting the number of radio contacts after varying months 2 weeks ago
QSO count plot up to March 2019 After a month with a holiday and a month with one contest I redid the QSO count plot to see the development.

before, before, before, before, before

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2019-04-01 Wat volts extra 2 weeks ago
UPS invoer voltage laatste jaar Het viel me op in de grafieken van het invoer voltage volgens de UPS dat het voltage vanaf het stroomnet is gestegen tot 238 volt aan het eind van september 2018. Ik vraag me af wat de oorzaak is van deze wijziging. Het kan niet zijn door de toename van zonnepanelen in de omgeving, het gestegen voltage is zowel overdag als 's nachts.

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2019-03-29 Still looking for the correct frequency for FT8 on the 70 centimeter band 2 weeks ago
Although FT8 does great work for weak signal reception on HF bands it's also nice for the 2 meter band and the 70 centimeter band. So after lots of tries with the 2 meter band I decided to give the 70 centimeter band another try. But, there is one thing: there aren't many stations active in FT8 on 70 centimeter and even when one is active in the nearby area that station may be on a different FT8 frequency. The real standard is not there yet.

Until now I've seen:
  • 432.174 MHz
  • 432.176 MHz
  • 434.670 MHz
I check for activity via the PSKreporter site. My two FT8 on 70 centimeter contacts where on 432.174 and 432.176.

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2019-03-24 Now also mapping 70cm gridsquares 3 weeks ago
In the past week I made my second 70cm FT8 contact, and again with another amateur in the JO22 gridsquare. So the map for 70cm gridsquares contacted and confirmed isn't very spectacular yet, but I'm going to generate and maintain it anyway.

Now in the list of maps at pe4kh.idefix.net.

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2019-03-22 Distributed authenticated smtp scanning 3 weeks ago
I noticed a lot of entries in my mail logging about aborted smtp transactions
Mar 22 21:04:04 gosper sm-mta[30180]: x2MK437r030180: [] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA-v6
Mar 22 21:04:58 gosper sm-mta[30229]: x2MK4vv0030229: [] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA-v6
Mar 22 21:05:25 gosper sm-mta[30307]: x2MK5Oas030307: [] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA-v6
Mar 22 21:06:01 gosper sm-mta[30328]: x2MK5xAc030328: [] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA-v6
Mar 22 21:06:02 gosper sm-mta[30331]: x2MK5xg5030331: [] did not issue MAIL/EXPN/VRFY/ETRN during connection to MSP-v6
And I wondered what was going on, until I did a capture of the session and had a look:
    1   0.000000 → TCP 68 55448 → 25 [SYN, ECN, CWR] Seq=0 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1
    2   0.000314 → TCP 68 25 → 55448 [SYN, ACK] Seq=0 Ack=1 Win=29200 Len=0 MSS=1460 SACK_PERM=1 WS=128
    3   0.034751 → TCP 56 55448 → 25 [ACK] Seq=1 Ack=1 Win=65536 Len=0
    4   6.038967 → SMTP 395 S: 220-gosper.idefix.net ESMTP Sendmail 8.15.2/8.15.2/Debian-8; Fri, 22 Mar 2019 21:00:55 +0100; (No UCE/UBE) | 220-   This is a private SMTP server. | 220-   The use of this or any related system for the transmission of | 220-   Unsollicited Bulk E-mail (UBE) is prohibited. | 220 logging access from: [](FAIL)-[]
    5   6.072501 → SMTP 76 C: EHLO
    6   6.072915 → TCP 56 25 → 55448 [ACK] Seq=340 Ack=21 Win=29312 Len=0
    7   6.073011 → SMTP 267 S: 250-gosper.idefix.net Hello [], pleased to meet you | 250-ENHANCEDSTATUSCODES | 250-PIPELINING | 250-EXPN | 250-VERB | 250-8BITMIME | 250-SIZE | 250-DSN | 250-ETRN | 250-STARTTLS | 250-DELIVERBY | 250 HELP
    8   6.106154 → SMTP 68 C: AUTH LOGIN
    9   6.106585 → SMTP 86 S: 503 5.3.3 AUTH not available
   10   6.141445 → TCP 56 55448 → 25 [FIN, ACK] Seq=33 Ack=581 Win=65024 Len=0
   11   6.141775 → TCP 56 25 → 55448 [FIN, ACK] Seq=581 Ack=34 Win=29312 Len=0
   12   6.174430 → TCP 56 55448 → 25 [ACK] Seq=34 Ack=582 Win=65024 Len=0
Each session starts ESMTP and even with the ESMTP reply not listing AUTH the next command is 'AUTH LOGIN' for authenticated smtp, and as soon as my server denies offering this the session gets aborted. This does mean no failed authentication attempt is logged which would trigger fail2ban.

This does look like a bit of a distributed attack, but without the network remembering that the attack is not going to work in this way and therefore trying it again and again.

Update: IPs active in this scanning attack sofar:

Update 2019-03-24: I noticed the incorrect EHLO above and looked at options for HELO/EHLO checking in sendmail. Searching did not show a lot of options, trying with the $&s delayed s macro did not fire on the given HELO/EHLO. So I kept searching and found the latest sendmail administration guide ('Bat book') with FEATURE(block_bad_helo). I activated this feature to see if it stops some of this traffic.

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The person

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

The job

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

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

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Meningen zijn die van mezelf, wat ik schrijf is beschermd door auteursrecht. Sommige publicaties bevatten een expliciete vermelding dat ze ongevraagd gedeeld mogen worden.
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