News archive February 2022 - Koos van den Hout

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2022-02-25 Why the wifi in the shed is probably unreliable
I used the raspberry pi in the shed to do a wifi scan, to get an idea of the usage of the 2.4 GHz wifi band as seen in the shed.

This finds 18 to 22 networks, with our own network not as the strongest network. As you can imagine most channels have multiple networks on them. And the overlap in wifi channels makes this worse: the networks on channel 2 see interference from those on channel 1.

From the list of networks, with names and address information removed, just leaving signal strength and channel / frequency:
-93 dBm, ch   1, 2412 MHz
-91 dBm, ch   1, 2412 MHz
-92 dBm, ch   1, 2412 MHz
-72 dBm, ch   1, 2412 MHz
-92 dBm, ch   1, 2412 MHz
-88 dBm, ch   1, 2412 MHz
-92 dBm, ch   1, 2412 MHz
-91 dBm, ch   2, 2417 MHz
-80 dBm, ch   2, 2417 MHz
-90 dBm, ch   3, 2422 MHz
-94 dBm, ch   4, 2427 MHz
-93 dBm, ch   5, 2432 MHz
-94 dBm, ch   5, 2432 MHz
-80 dBm, ch   6, 2437 MHz
-94 dBm, ch   8, 2447 MHz
-95 dBm, ch   8, 2447 MHz
-94 dBm, ch   9, 2452 MHz
-95 dBm, ch   9, 2452 MHz
-77 dBm, ch  10, 2457 MHz
-84 dBm, ch  11, 2462 MHz
-93 dBm, ch  11, 2462 MHz
This is a right mess. If I ever want reliable wifi in the back garden/shed I will have to have an extra access-point there. This option of having wireless vlan(s) available in the shed has influenced the choice in switch for the shed.

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2022-02-25 Fraudepoging "Vergeet niet binnen 2 dagen je belasting te betalen!"
Cybercriminal Ook weer een typisch geval van bitcoin afpersing. De tekst is ook hier behoorlijk goed nederlands. Bekend en berucht bij de fraudehelpdesk: Opnieuw afpersmails over bezoek pornosite - fraudehelpdesk.nl.
Hallo, hoe gaat het met jou? Ik weet het, het is vervelend om een gesprek te beginnen met slecht nieuws, maar ik kan niet anders. Enkele maanden geleden heb ik toegang gekregen tot je apparaten die je gebruikt om op het internet te browsen. Vervolgens heb ik al je internet activiteiten kunnen traceren. Hieronder kun je lezen hoe ik dit voor elkaar heb gekregen: Allereerst heb ik van hackers de toegang tot meerdere e-mail accounts gekocht (tegenwoordig is dat een fluitje van een cent om dat online te doen). Daarna kon ik heel makkelijk op je e-mail account (xxxx@example.com) inloggen. Een week later heb ik een Trojan virus geïnstalleerd in de besturingssystemen van al de apparaten die je gebruikt om je mails te openen en te lezen. Om eerlijk te zijn ging dat vrij simpel (want je opent de links uit je inbox mails).
Het bitcoinadres waar 1790 euro heen mag is 1AJcoDsSGe9teEfzSMicXprJFae7729J5y.

Update 2022-02-26: Nog een keer dezelfde spam gezien met bitcoinadres 1AJcoDsSGe9teEfzSMicXprJFae7729J5y en 1DfSBC5xbeswbXingkkf3i6VyQwYb8kYGh.

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2022-02-23 Filtering logs to only get relevant reports
I want to know if something goes wrong but with the number of (virtual) servers here at home it is not possible to check all logs constantly. So the main machines use logcheck to find the interesting error messages and the rest gets filtered out.

Ideally that leaves no messages, but I do want to know about patterns that indicate attacks so I do get messages constantly about ssh attack attempts and weird nameserver requests or misconfigured nameserver responses.

Recently I've been checking the resulting reports again carefully and noticed some more patterns that could be filtered. And I found two misconfigurations that I solved. Normally those misconfigurations would drown in the noise of the log, only to be found if I was looking for something else. Now it started to stand out after filtering out a lot of messages that are to be expected.

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2022-02-22 Shed switch ordered
In the project to upgrade the connectivity to our shed I ordered a switch with sfp slots: a netgear GS310TP. The choice is to have the same brand as in other places in the network so I can select compatible SFP modules easily. With this switch I also have vlan support so I can have a wifi access point in the shed if I want.

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2022-02-21 I participated in the ARRL DX CW contest 2022
CW contest filling the bands on a websdr As I'm trying to make more morse contacts the 'easy' way is to participate in contests in morse. Last weekend was the ARRL DX CW contest and I heard quite a bit of contest morse on the 20 meter band. I tried a few contacts and after two contacts got the reply 'USA ONLY'. So I looked up the ARRL DX contest rules and found out that indeed for non-US/Canada stations only contacts with US/Canada are valid. Since I didn't hear any stations from that area in the late afternoon I left it at that. But in the early evening after the sun goes down but before the propagation on 20 meters dies down completely it is possible to make contacts with North America. So on Saturday and Sunday evening I used that 'window' to get several stations in the log. If these get all confirmed I should get several new US states in morse.

It was also a good practise in decoding callsigns and return information in morse with noisy conditions.
Band   160   80   40   20   15   10
QSO's    0    0    0   30    0    0
Mult     0    0    0   16    0    0
Raw Score: 84 Qpts x 16 Mults = 1344.

The objective for this contest is to expand knowledge of DX propagation, so I already met that objective with fine-tuning my operating window to have a good opportunity to work US stations in morse.

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2022-02-19 Receiving DMARC reports and trying to debug my DKIM setup
Since November 2021 I have been running DKIM with sendmail. First for a test domain, later also for the main domain sending e-mail.

I directly added a DMARC record with options to notify me of spf/dkim errors. I have seen a few reports of fake mail injected but most reports were about valid mail. For a long time google kept sending reports about dkim errors but I couldn't find out why. After I added the option to receive debug information this problem did not come back, so I'm not sure whether I fixed this.

Today I sent something to a mailing list and got a debug report instantly. Somewhere after the mailing list software had changed the body of my message (it stripped the pgp signature and noted this) a mail server checked the DKIM headers and found out the body signature was wrong. Indeed. Mailing lists and DKIM/SPF are complicated.

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2022-02-16 Closing 2021 in amateur radio
QSO count plot up to December 2021 I noticed I didn't do a "Closing 2021 in amateur radio" post yet, so time to catch up. Looking back at the Review of 2020 in amateur radio with plans for 2021 I can say:
  • Practising morse has happened! Just no exam yet, but that is mainly due to the current circumstances
  • Satellite contacts: none.
  • Morse and phone in contest: yes!
  • New qsl cards ordered and in use
And the plans for 2022:
  • More and more morse, and that exam. There is an exam date now and it will be possible to get the wanted 'CW included' on my radio amateur identification
  • Again satellites
  • In contests: try to get more morse and phone contacts.
  • Use the better propagation to get contacts on different bands

More detailed statistics over 2021

And I had to check my own notes again how I got these numbers last year, so I'm adding the sql queries I typed at the mysql/mariadb client. With the database behind cqrlog available I can make all kinds of queries.

By month

The influence of months with (digital) contests isn't as strong as in previous years.
+-------+-----+
| month | cnt |
+-------+-----+
|     1 | 234 |
|     2 | 204 |
|     3 | 238 |
|     4 | 161 |
|     5 | 131 |
|     6 | 111 |
|     7 | 211 |
|     8 |  19 |
|     9 | 232 |
|    10 | 204 |
|    11 | 191 |
|    12 | 101 |
+-------+-----+
Query: select month(qsodate) as month,count(id_cqrlog_main) as cnt from cqrlog_main where year(qsodate)=2021 group by month order by month;

By band

No real surprises there. And the feeling that 10 meter was improving isn't showing in the statistics yet.
+------+-----+
| band | cnt |
+------+-----+
| 40M  | 699 |
| 20M  | 849 |
| 17M  | 151 |
| 15M  |  40 |
| 10M  | 243 |
| 2M   |  51 |
| 70CM |   4 |
+------+-----+
Query: select band,count(id_cqrlog_main) as cnt from cqrlog_main where year(qsodate)=2021 group by band order by freq;

By mode

Almost double the number of morse contacts compared to the previous year.
+-------+-----+
| mode  | cnt |
+-------+-----+
| JT65  |   2 |
| PSK31 |   3 |
| FM    |  19 |
| FT4   |  35 |
| PSK63 | 226 |
| CW    | 240 |
| SSB   | 267 |
| RTTY  | 386 |
| FT8   | 859 |
+-------+-----+
Query: select mode,count(id_cqrlog_main) as cnt from cqrlog_main where year(qsodate)=2021 group by mode order by cnt;

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2022-02-15 My work PGP key needed replacement and using PGP keys in thunderbird with their original passphrases
PGP logo Today I tried to sign a key with my work PGP key, and after lots of tries the conclusion was that my 2006 work pgp key was too infected with SHA1 signatures that I couldn't remove, so I created a replacement work PGP key. Even a signature for the new key with the old key was rejected.

So the new work key:
pub   rsa4096/0x36FF19C6159C0262 2022-02-15 [SC] [expires: 2027-02-14]
      Key fingerprint = 1401 EE9F 25AD 23F1 C299  FD07 36FF 19C6 159C 0262
uid                   [ultimate] Koos van den Hout <k.vandenhout(at)uu.nl>
uid                   [ultimate] Koos van den Hout <koos(at)surfcert.nl>
sub   rsa4096/0x918F8E7A170EA93E 2022-02-15 [E] [expires: 2027-02-14]
I also signed it with my personal key, and I will try to get more signatures for the new work key to make things work better. Available at PGP key 0x36ff19c6159c0262. There you will see I also signed it with my old work key 0x42216fe29ee949cf but since that signature is also a SHA1 signature the new gpg implementation immediately rejects it. So I should get some signatures from people who have relatively new PGP keys. I've been using PGP since 1993 (29 years now!) and I can see the developments in PGP over the years in my keys.

In the process I noticed one thunderbird installation insists on managing PGP keys completely and the other doesn't. Searching for the reason eventually found Use Thunderbird 78 with System GnuPG Keyring and I made sure the option mail.openpgp.allow_external_gnupg was set to true.

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2022-02-14 I participated in the CQ WPX RTTY 2022 contest
RTTY Contest on websdr Last weekend was the same as in 2021: the PACC and the CQ WPX RTTY contest in one weekend. Since the CQ WPX RTTY contest is 48 hours and the PACC contest is 24 hours I participated in both. Not for 48 hours, I had a normal weekend otherwise.

In the end I made 106 contacts in the CQ WPX RTTY contest. 50 contacts on the 40 meter band and 56 contacts on the 20 meter band.

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2022-02-14 I participated in the PACC 2022 contest
CW contest filling the bands on a websdr Last weekend was the weekend of the Dutch PACC contest, 'our' contest organized by the Veron. Open for radio amateurs from all over the world, making contacts with Dutch radio amateurs especially interesting.

I decided to only do morse in the PACC this year, to get the practice with contest-speed morse and maybe improve the number of countries with morse I have in the logs. In the end I made 43 contacts. The report:
Callsign: PE4KH
Category: SINGLE-OP ALL LOW CW

Band     Qso    Cancelled  Dup  Point  Penalty  Mult        Score
160M       0            0    0      0        0     0
 80M       0            0    0      0        0     0
 40M      38            0    0     38        0     6
 20M       5            0    0      5        0     4
 15M       0            0    0      0        0     0
 10M       0            0    0      0        0     0
-----------------------------------------------------------------
          43            0    0     43        0    10          430
I'm not going to be the winner in my category with this score but I'm happy with my amount of CW contacts.

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2022-02-08 Upgrading the fiber to the shed network
The current fiber to the shed network is working fine but only gives the Raspberry Pi based NTP server network at a speed of 100 mbit.

The link is working fine but the next device with network problems due to unreliable wifi is showing up: the solarpanel inverter in the shed is sometimes unreachable for my solar inverter monitoring using modbus/tcp and that means I 'miss' measurements. The propetairy monitoring that solaredge does can deal with interruptions in reachability and upload older data, but the modbus/tcp monitoring I use can only access real-time data.

My first plan was to look at industrial switches because of the extended temperature and humidity ranges in the shed. But having both 'industrial' and 'sfp slot' costs a lot of money.

My next thought is to put all the possibly sensitive electronics in one case and hope the temperature and humidity inside that case stay within a reasonable range. This thought is based on the fact that the Raspberry Pi based NTP server functions fine in a not very closed wooden box without being affected by temperature or humidity.

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IPv6 check

Running test...
, 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

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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.
My opinions are my own, what I write is protected by copyrights. Some publications contain an explicit license statement which allows sharing without asking permission.
Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
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