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by ejolson
Tue Oct 17, 2017 3:56 am
Forum: General discussion
Topic: KRACK Key Reinstallation Attacks raspbian patch?
Replies: 6
Views: 566

Re: KRACK Key Reinstallation Attacks raspbian patch?

I didn't see the Debian security update in Raspbian 10 hours ago, but it seems to be there now. The usual "apt-get update; and apt-get upgrade" as mentioned above should install the patches. Whether there will be more updates needed is yet to be seen.
by ejolson
Tue Oct 10, 2017 5:40 pm
Forum: General discussion
Topic: TS Licensing Server Does Not Issue License for Raspberry Pi Device
Replies: 9
Views: 610

Re: TS Licensing Server Does Not Issue License for Raspberry Pi Device

It's simple. I have set up a Raspberry device so that it can replace the thin clients used here in the company I work with. I'm using the FreeRDP package so it can connect to the TS servers. The thin clients we use are branded WYSE, and they issue the equipment license normally on my TS license ser...
by ejolson
Sat Sep 23, 2017 7:20 pm
Forum: General discussion
Topic: Static IP address
Replies: 9
Views: 468

Re: Static IP address

My college allow. How you go about setting up networking depends on how you want to access the Pi later. Almost all colleges and universities have firewalls, many also assign private IP numbers to internally connected machines, especially those in dorms. DHCP is often used to distribute the IP numb...
by ejolson
Fri Sep 22, 2017 11:40 am
Forum: General discussion
Topic: Pi Web Server Local Security Worries.
Replies: 9
Views: 496

Re: Pi Web Server Local Security Worries.

Heater wrote:
Fri Sep 22, 2017 2:48 am
ejolson,
You probably mean a computer health and system monitoring tool, as a network attack tool sounds like something used by criminals.
Well there is the problem. They are the same thing.
I was thinking of system monitoring tools such as Nagios or Icinga which are not the same thing.
by ejolson
Thu Sep 21, 2017 10:10 pm
Forum: General discussion
Topic: Pi Web Server Local Security Worries.
Replies: 9
Views: 496

Re: Pi Web Server Local Security Worries.

A clear and present danger should help the learning curb, after all thats what the RP is all about. Now you have me thinking, are there any tools that I can use to turn my PI into a network attack (testing ) tool? You probably mean a computer health and system monitoring tool, as a network attack t...
by ejolson
Sat Sep 16, 2017 4:11 am
Forum: General discussion
Topic: New Raspberry Pi targeted by malware.. warning to new users!
Replies: 14
Views: 1038

Re: New Raspberry Pi targeted by malware.. warning to new users!

Everything was successful and it worked fine, but we forgot to change default Pi password... Last week Bruce Schneier commented on how surprisingly difficult it is to secure a Raspberry Pi . Quoting from his post Reading it, I am struck by how much work it is to secure. I fear that this is beyond t...
by ejolson
Sat Sep 16, 2017 12:07 am
Forum: General discussion
Topic: The PI3 NIGHTMARE Continues Help Needed [solved]
Replies: 8
Views: 590

Re: The PI3 NIGHTMARE Continues Help Needed

Ok so as you can tell by my recent posts my PI3 Has been giving me headaches. Everytime I opened youtube it would freeze and randomly corrupted my superblock What you describe could be caused by a marginal power supply. Is a "lighting bolt" icon on the screen? What does the command "vcgencmd measur...
by ejolson
Thu Sep 14, 2017 8:29 pm
Forum: The Staffroom
Topic: Golang for beginners on Raspberry Pi Guide Copyright question
Replies: 8
Views: 864

Re: Golang for beginners on Raspberry Pi Guide Copyright question

I plan to write an open guide for Golang beginners on the Raspberry Pi A guide for golang sounds interesting. There are two implementations: one based on the code generator developed by Thompson and another which leverages the gcc backend. Will you focus on one or the other? Also do you have GPIO p...
by ejolson
Sat Sep 09, 2017 6:20 pm
Forum: Advanced users
Topic: Advice regarding multiple hosts
Replies: 4
Views: 307

Re: Advice regarding multiple hosts

BTW: i have a RPi-PXE-Server project at github for PC and rpi PXE-booting (at the moment only one RPi in the script) as soon i get userspace nfs and nfs export for overlayfs working, i will update the script(s) for multiple pi's with shared boot and shared root. Another approach which does away wit...
by ejolson
Thu Sep 07, 2017 4:55 pm
Forum: Beginners
Topic: pi zero w painfully slow.
Replies: 9
Views: 394

Re: pi zero w painfully slow.

The causes for Pi Zero being slow when browsing the web and running integrated office applications are slow CPU speed coupled with not enough RAM. It may be possible to clock the CPU 20% faster to about 1000 Mhz, however, little can be done to increase the RAM. Moreover, lack of sufficient RAM is th...
by ejolson
Fri Sep 01, 2017 1:58 am
Forum: Using Raspberry Pi in the classroom
Topic: Multi-use computer Lab
Replies: 1
Views: 568

Re: Multi-use computer Lab

I really want to be able to use a KVM switch to be able to switch between all the different pc's and the Pi's, but have not had much luck. We are using VGA KVM 4-port switches with a VGA to HDMI splitter. The biggest issue is that I can switch between devices, but then either video won't display pr...
by ejolson
Fri Sep 01, 2017 12:49 am
Forum: General discussion
Topic: Play DVCPRO video with omxplayer
Replies: 6
Views: 325

Re: Play DVCPRO video with omxplayer

Your 25 mbit DVCPRO is the same digital encoding used by standard definition Sony digital-8 and miniDV consumer camcorders. The only thing that made it "pro" was the use of a more reliable tape format when recording. It looks like your particular file was rendered by Adobe Premiere. Though primarily...
by ejolson
Wed Aug 30, 2017 12:36 am
Forum: General discussion
Topic: Overheating RP3
Replies: 5
Views: 432

Re: Overheating RP3

Followup - this problem has been solved for some time, but just getting back to updating this thread. The issue was that I thought I had created 3 processes, including 1 very intensive process. What I didn't realize was that using a animated matplotlib plot creates its own intensive process - so I ...
by ejolson
Fri Aug 25, 2017 3:31 pm
Forum: Using Raspberry Pi in the classroom
Topic: Raspberry PiNet(s) centrally / cloud managed?
Replies: 3
Views: 760

Re: Raspberry PiNet(s) centrally / cloud managed?

Remotely administering a server can be done using residential-speed internet. If the same students want to log in and access the same home directory from different locations you need a high-speed low-latency cross connect between sites. Software such as Syncthing could allow students to access the s...
by ejolson
Thu Aug 17, 2017 6:07 pm
Forum: General discussion
Topic: system broken beyond repair - recovery - can't format MicroSD
Replies: 7
Views: 404

Re: system broken beyond repair - recovery - can't format MicroSD

The issue of a write protected sdcard comes up often enough, it is surprising there isn't a guide how to diagnose the problem. In addition to the obvious write protect switch on the sdcard adapter used in a PC, there are two firmware flags in the sdcard standard that can be set to write protect the ...
by ejolson
Sat Aug 12, 2017 11:49 pm
Forum: C/C++
Topic: Cilkplus on RPi2B
Replies: 24
Views: 10417

Re: Cilkplus on RPi2B

I just filed a bug report at the gcc bugzilla site about this performance regression. The reply I received indicated that the MIT/Cilkplus parallel processing extensions to the C programming language, which were added to gcc version 4.9 in 2013, have been deprecated and will be removed from gcc star...
by ejolson
Fri Aug 11, 2017 12:55 am
Forum: C/C++
Topic: Cilkplus on RPi2B
Replies: 24
Views: 10417

Re: Cilkplus on RPi2B

Version 7.1 of gcc now automatically builds for ARM with Cilkplus enabled. However, the commands $ rm *.o $ /usr/local/gcc-6.2/bin/gcc -fcilkplus -O3 \ -mcpu=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard \ -ffast-math -Wall -c -o bench.o bench.c $ /usr/local/gcc-6.2/bin/gcc -fcilkplus -O3 \ -mcpu=cort...
by ejolson
Sat Jul 29, 2017 7:41 pm
Forum: General discussion
Topic: Pi 3 rc car steering
Replies: 8
Views: 482

Re: Pi 3 rc car steering

Most remote control cars already have H-bridges in them. Trace the circuit back to the radio control chip. In a typical case the RC chip will have four 3V outputs corresponding to left, right, forward and back. Find them, follow the traces back toward the H-bridges until you meet the first resistor....
by ejolson
Sat Feb 04, 2017 5:40 pm
Forum: General discussion
Topic: Raspbian with Read-only Root
Replies: 89
Views: 22922

Re: Raspbian with Read-only Root

i roughly understand how this overlayfs idea works but how could i best learn about the details? what is this upper and lower thing for example? The Linux kernel contains documentation on unionfs . I also ran across some bug discussions in online forums. how did you learn about all of this? is this...
by ejolson
Sat Feb 04, 2017 5:27 am
Forum: Off topic discussion
Topic: No wonder....
Replies: 15
Views: 2394

Re: No wonder....

The people running the education system are killing it. They are incompetent, thinking only of the money, and not the fact we need smart children for the future. Maybe the schools should be sold like the post office. Or better yet, one private company can own the buildings and another manage the cl...
by ejolson
Fri Feb 03, 2017 3:15 am
Forum: General discussion
Topic: Reliability of Raspberr Pi for a Home Security/Alarm system?
Replies: 28
Views: 3235

Re: Reliability of Raspberr Pi for a Home Security/Alarm sys

The reason for my questions about stability is that a Pi is running a fairly complex OS. Yes, a similar OS to mine and many servers out there that run for YEARS without fail. ABSOLUTELY. While Linux is indeed complex, it is well maintained by an active and experienced team. In my opinion Linux is n...
by ejolson
Fri Feb 03, 2017 2:16 am
Forum: General discussion
Topic: Raspbian with Read-only Root
Replies: 89
Views: 22922

Re: Raspbian with Read-only Root

what do you think about the other script epoch1970 posted? That script seems based on the same idea: pivot root to an overlayfs. The advantage of the script is simplicity by avoiding the initramfs, and I prefer simplicity. The disadvantage would be not having the educational opportunity to learn ho...
by ejolson
Thu Feb 02, 2017 6:22 pm
Forum: General discussion
Topic: Raspbian with Read-only Root
Replies: 89
Views: 22922

Re: Raspbian with Read-only Root

here is the first version of my script. I like it. Thanks for spending the time working on this. The comments, usage and code seem straightforward. It would nice to include a "help" feature that would explain the usage if an unrecognized command is entered. You might want to check /etc/apt/sources....
by ejolson
Thu Feb 02, 2017 5:54 pm
Forum: General discussion
Topic: Max USB devices - revisited
Replies: 5
Views: 756

Re: Max USB devices - revisited

Is it possible that the "8 device limit" is a fanout restriction where the hub itself is counted as a device? I seem to recall seeing 14 port hubs from time to time, which would argue that 8 is not an actual, direct limit. As far as I know, the eight device limit is specific to the Pi hardware and ...
by ejolson
Thu Feb 02, 2017 4:46 pm
Forum: General discussion
Topic: "Full" Linux on Pi?
Replies: 69
Views: 7834

Re: "Full" Linux on Pi?

The Linux stuff is probably all there, only requiring a recompile of the kernel with some different flags My understanding is that the real-time kernel stuff is not there. In particular, LinuxCNC requires predictable and no greater than 30ms latency on the parallel port. This is achieved with RTAI ...

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