Dan's notes (Page 10)

More issues

Fedora-based router with DHCPv6-PD support

I threw together some hardware I had on hand to make a PC-based router. IPv4 Getting IPv4 working was easy, I just needed to set ZONE=external and ZONE=trusted on the wan/lan interface ifcfg-* files. I threw net.ipv4.ip_forward=1 in /etc/sysctl.conf as well.

Beaglebone Cape for NS-T, revision 2

I'm testing the second revision of this cape now. Schematic is on github [https://github.com/ddrown/NS-T-BBB-Cape] (left: rev1, right: rev2) It's working much better than rev1, but time will tell if it has the same frequency dropouts. I've also published the NTP

Update on Beaglebone Cape for Navspark NS-T

The cape [https://blog.dan.drown.org/beaglebone-cape-for-navspark-ns-t/] has been running for 5 days now. I've been tweaking the system to see if I can get it stable. So far, the local clock looks like this: The red line shows the clock offset. When things are working properly,

Beaglebone Cape for Navspark NS-T

Goal My next goal in the quest for a better NTP server is to improve the TCLKIN source. Previously, I was experimenting with TCXO's. I bought a Navspark NS-T (a timing-grade GPS receiver) and designed an adapter cape for it. This is my first time designing a circuit

TCXO + Beaglebone Black, part 2

Starting from the previous TCXO modification [https://blog.dan.drown.org/tcxo-beaglebone-black/], I wanted to get a 24MHz TCXO working. Trial #1 I bought a set of three undocumented 24MHz TCXO's off ebay for $6. I was hoping that since they were not SMD parts, they would be

TCXO + Beaglebone Black

I've added support for an external clock (TCLKIN) to the Beaglebone Black timer driver [https://blog.dan.drown.org/beaglebone-black-timer-capture-driver/]. Setup I used what I had on hand to test it. I setup a Navspark microcontroller to send a ~1MHz PWM (code here [http://dan.drown.org/bbb/

Beaglebone Black timer capture driver

More info on: Hardware [https://blog.dan.drown.org/beaglebone-black-gpstemperature-cape/], Kernel Driver software [https://github.com/ddrown/pps-gmtimer] The Beaglebone Black has a hardware timer capture. This means it can save the couter value at the time an input edge happens. Since it has a 24MHz clock, the timer has

Beaglebone Black GPS+Temperature cape

I moved my Beaglebone Black GPS+Temperature [https://blog.dan.drown.org/beaglebone-black-ntpgps-server/] setup from a breadboard to a proto cape. The soldering isn't great, and the wire I had on had was much too thick for this. The back, with the DS18B20 sensor (ends up near the

SB6183 vs DG1670A latency

See also: SB6183 dropping IPv6 traffic [https://blog.dan.drown.org/sb6183-dropping-ipv6-traffic/] Comparing latency in cable modems: SB6183 (16 channel DOCSIS 3 modem only) vs DG1670A (16 channel DOCSIS 3 modem+router combo, in bridge mode) Arris DG1670A Average latency of 100 ICMP echo replies to the default gateway: 20.

Beaglebone Black NTP/GPS Server, Temperature Compensation part 2

See the Part 1 of Temperature Compensation [https://blog.dan.drown.org/beaglebone-black-ntpgps-server-temperature-compensation/] or the hardware setup [https://blog.dan.drown.org/beaglebone-black-ntpgps-server/] Overview In part 1, I did a trial run of chrony's temperature compensation and got a pretty good result. In this part, I collected more