44net

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3194 discussions

Re: [44net] new ntp server for amprnet
by Rob Janssen 10 Oct '17

10 Oct '17

> In the US, the surplus equipment market occasionally had GPS-trained > oscillators that could provide 10Mhz and 1pps clocking as well as NMEA > output. They were parts of CDMA cellphone base stations, each of which > had at least two. The one I have was made by HP. I also have one that > is a Motorola device that was used to synchronize simulcast transmitters > in repeaters. That is the kind of box (from other manufacturers) that we use as well, attached to a PC with 1PPS and NMEA and to the repeater with 10 MHz. Chrony on the PC keeps the Linux clock within 10us (usually within 1-2us) which we require for the simulcast, and 10 MHz provides the exact transmit frequency reference. Power... well, maybe it has an oven stabilized crystal oscillator. Or very old digital logic that is a bit too power-hungry. Of course a lowcost uBlox/ SiRF module is easy to get going and provide 1PPS for ntpd. The LeoNTP box is a plugin-and-forget network clock, of course not the cheapest solution. A Raspberry Pi can be used, I have one in the IPv6 NTP pool at 2a00:f10:103:201:ba27:ebff:fefd:984 Rob

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Re: [44net] new ntp server for amprnet
by Rob Janssen 10 Oct '17

10 Oct '17

> I also have a stratum 1 NTP server, it is on 44.13.151.3 (ntp.g1fef.ampr.org) and it is open to 44/8 > It’s a Symmetricom S200 with Rubidium clock and GPS and is located in the UK for anyone in Europe it would be better choice than the US based clocks. For people who want an easy stratum 1 server and don't have money for such gear, have a look at the LeoNTP. It is made by a UK radio amateur and it is a GPS locked NTP server in a very small package. It costs "only" 300 pounds (about $400). We have considered it for repeaters but unfortunately it cannot provide 10 MHz and 1PPS at the same time, which we do require. Rob

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new ntp server for amprnet
by Martinez, Philip 10 Oct '17

10 Oct '17

Hi team, My name is is Philip (KC3IPF) and I'm making my network ntp server available to the amprnet. All I ask is pre-notification of the subnets being served so I can open my firewalls and permit the ntp daemon to service the networks. You can contact me pm1183 at messiah dot edu. It is a stratum 3 server and all I ask is don't be abusive. The address is kc3ipf-01.ampr.org. Philip

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OT: Toy measurement equipment
by Rob Janssen 10 Oct '17

10 Oct '17

I remember well from when I started in electronics how much money had to be spent on measurement equipment, e.g. a multimeter or a scope. Today, there are some very interesting devices available from Chinese suppliers e.g. via Aliexpress or Ebay. Can be very useful for quick measurements/testing in the amateur radio station, to get new (young) people interested in electronics, etc. For about $25 you can get the Aneng AN-8008 DMM that has 4 digits (9999 count) and measures DC and AC (true RMS!) voltage and current, resistance, capacitance, frequency and can even generate audio tones. It has very low ranges, the least significant digit displays uV or uA on the lowest range. Very useful, as long as you don't use it to measure dangerous voltages or currents. I also got a kit for a 200kHz (1 MSPS) single-channel storage scope for less than $25. Takes about 2hrs to assemble, and you have a pocket size storage scope that I would really have liked to have back in the days of packet radio, you can have one of them connected to each receiver and see the audio quality all the time. It can display peak and RMS voltage, frequency etc on-screen. JYE TECH Digital Oscilloscope DIY Kit (can be found with or without case) Another nice toy is the M328 LCR-T4 component tester. Based on a design originally published in a magazine, there are several different versions available that differ in connections and if it does/does not include a case. I have one that uses a ZIF socket for the connection. It has 3 test terminals and you can connect a transistor, fet, triac, resistor, capacitor, inductor, diode, zener etc to the test terminals and it will display the type of component, pinout, and value on the LCD screen. Includes other useful info like the ESR of a capacitor, capacitance of a diode, etc. Can be found for less than $10. Of course it all isn't professional test equipment, but it is a lot of fun for the money if you ask me... Rob

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Re: [44net] new ntp server for amprnet
by Rob Janssen 09 Oct '17

09 Oct '17

> Now it's back.. >http://wiki.ampr.org/wiki/Services The server gw-44-137.pi9noz.ampr.org (44.137.0.1) mentioned on that page is also still available to AMPRnet users, but of course it is in Europe (Amsterdam) so not as accurate for users in the USA as a more local server would be. It has about 150 clients. The server itself is usually within 300us of UTC, it is referenced from 8 GPS clocks of different types (Datum 9390-52054, Trimble Thunderbolt, Meinberg) used in our same-frequency repeater network, plus various other external sources. It automatically fetches the leap-second announcement file from IERS once a month to handle leap seconds smoothly. Rob

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IPv6 stuff
by Steve L 08 Oct '17

08 Oct '17

I added a collection of notes I have had locally on IPv6 to the wiki. I am not much of a wiki guy, so I encourage others to edit its layout and make it look pretty. But its a start to put the info in one place. And others can add to it as we progress. http://wiki.ampr.org/wiki/Ipv6 Brian/Chris: Also, is there any chance it could be changed so that PDF's could be uploaded to the wiki? Looks like it only accepts images presently. Steve, KB9MWR

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rip broadcasts not up-to-date?
by Boudewijn (Bob) Tenty 06 Oct '17

06 Oct '17

Brian. I don't believe a correct updated ipip route table is transmitted by the rip broadcasts of ucsd/ampr.org. A friend has now a static ip since yesterday and the portal has the correct ip and updated encap.txt. but he is not receiving the rip broadcasts and I have still his old commercial ip in my route table. 73, Bob VE3TOK

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Code execution flaw affects Linux, BSD systems
by Bill Horne 05 Oct '17

05 Oct '17

Code-execution flaws threaten users of routers, Linux, and other OSes Bugs in widely used Dnsmasq give attackers remote control of vulnerable systems. DAN GOODIN - 10/3/2017, 3:56 PM Google researchers have discovered at least three software bugs in a widely used software package that may allow hackers to execute malicious code on vulnerable devices running Linux, FreeBSD, OpenBSD, NetBSD, and macOS, as well as proprietary firmware. Dnsmasq, as the package is known, provides code that makes it easier for networked devices to communicate using the domain name system and the Dynamic Host Configuration Protocol. It's included in Android, Ubuntu, and most other Linux distributions, and it can also run on a variety of other operating systems and in router firmware. A blog post published Monday by security researchers with Google said they recently found seven vulnerabilities in Dnsmasq, three of which were flaws that allowed the remote execution of malicious code. Rest at: https://arstechnica.com/information-technology/2017/10/code-execution-flaws…

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Net44 test
by Jerry 05 Oct '17

05 Oct '17

Just testing the mailing list. I have had issues. And I wanted to see if this gets to my other email.. 73 jerry

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Re: [44net] hotmail
by Rob Janssen 04 Oct '17

04 Oct '17

> Quick question as to what methods you guys are using to "send in > exceptions" Is there a way of contacting hotmail support that doesn't > involve an endless loop of "we see no problems" with their tier 1 techs? I would say the contact with support should be made by the hotmail subscriber. They can claim they don't receive their important mail and want that situation rectified. They have a customer relation with hotmail. My experience is that contacting services where you are not a customer yourself is usually very difficult and will often not result in any action. > FYI I do already have SPF, PTR and DMARC records published in DNS which > has ensured reliable delivery to gmail addresses, but hotmail seems to > have their own internal scoring system Another problem is that hotmail uses a cache for SPF and DMARC and it takes very long to expire. I have seen mail problems in hotmail at least a month after an SPF record was changed to include more valid addresses, and they were still considered invalid (resulting in postmaster report via DMARC info). Rob

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