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Communications

Ask Slashdot: How Useful Are DMARC and DKIM? 139

Posted by timothy
from the survey-says dept.
whoever57 writes How widely are DKIM and DMARC being implemented? Some time ago, Yahoo implemented strict checks on DKIM before accepting email, breaking many mailing lists. However, Spamassassin actually assigns a positive score (more likely to be spam) to DKIM-signed emails, unless the signer domain matches the from domain. Some email marketing companies don't provide a way for emails to be signed with the sender's domain — instead, using their own domain to sign emails. DMARC doesn't seem to have a delegation mechanism, by which a domain owner could delegate other domains as acceptable signatures for emails their emails. All of these issues suggest that the value of DKIM and DMARC is quite low, both as a mechanism to identify valid emails and as a mechanism to identify spam. In fact, spam is often dkim-signed. Are Slashdot users who manage email delivery actually using DKIM and DMARC?
Linux

Ask Slashdot: Can You Say Something Nice About Systemd? 928

Posted by samzenpus
from the use-your-words dept.
ewhac writes: "I'm probably going to deeply deeply regret this, but every time a story appears here mentioning systemd, a 700-comment thread of back-and-forth bickering breaks out which is about as informative as an old Bud Light commercial, and I don't really learn anything new about the subject. My gut reaction to systemd is (currently) a negative one, and it's very easy to find screeds decrying systemd on the net. However, said screeds haven't been enough to prevent its adoption by several distros, which leads me to suspect that maybe there's something worthwhile there that I haven't discovered yet. So I thought it might be instructive to turn the question around and ask the membership about what makes systemd good. However, before you stab at the "Post" button, there are some rules...

Bias Disclosure: I currently dislike systemd because — without diving very deeply into the documentation, mind — it looks and feels like a poorly-described, gigantic mess I know nothing about that seeks to replace other poorly-described, smaller messes which I know a little bit about. So you will be arguing in that environment."

Nice Things About systemd Rules:
  1. Post each new Nice Thing as a new post, not as a reply to another post. This will let visitors skim the base level of comments for things that interest them, rather than have to dive through a fractally expanding tree of comments looking for things to support/oppose. It will also make it easier to follow the next rule:
  2. Avoid duplication; read the entire base-level of comments before adding a new Nice Thing. Someone may already have mentioned your Nice Thing. Add your support/opposition to that Nice Thing there, rather than as a new post.
  3. Only one concrete Nice Thing about systemd per base-level post. Keep the post focused on a single Nice Thing systemd does. If you know of multiple distinct things, write multiple distinct posts.
  4. Describe the Nice Thing in some detail. Don't assume, for example, that merely saying "Supports Linux cgroups" will be immediately persuasive.
  5. Describe how the Nice Thing is better than existing, less controversial solutions. systemd is allegedly better at some things than sysvinit or upstart or inetd. Why? Why is the Nice Thing possible in systemd, and impossible (or extremely difficult) with anything else? (In some cases, the Nice Thing will be a completely new thing that's never existed before; describe why it's good thing.)

We will assume out of the gate that systemd boots your system faster than ${SOMETHING_ELSE}, so no points for bringing that up. Bonus points are awarded for:

  • Personal Experience. "I actually did this," counts for way more than, "The docs claim you can do this."
  • Working Examples. Corollary to the above — if you did a Nice Thing with systemd, consider also posting the code/script/service file you wrote to accomplish it.
  • Links to Supporting Documentation. If you leveraged a Nice Thing, furnish a link to the docs you used that describe the Nice Thing and its usage.
Build

Ask Slashdot: How Do I Make a High-Spec PC Waterproof? 202

Posted by Soulskill
from the lots-of-duct-tape dept.
jimwormold writes: I need to build a system for outdoor use, capable of withstanding a high pressure water jet! "Embedded PC," I hear you cry. Well, ideally yes. However, the system does a fair bit of number crunching on a GPU (GTX970) and there don't appear to be any such embedded systems available. The perfect solution will be as small as possible (ideally about 1.5x the size of a motherboard, and the height will be limited to accommodate the graphics card). I'm U.K.- based, so the ambient temperature will range from -5C to 30C, so I presume some sort of active temperature control would be useful.

I found this helpful discussion, but it's 14 years old. Thus, I thought I'd post my question here. Do any of you enlightened Slashdotters have insights to this problem, or know of any products that will help me achieve my goals?
Data Storage

Ask Slashdot: Smarter Disk Space Monitoring In the Age of Cheap Storage? 170

Posted by timothy
from the percentages-matter-too-though dept.
relliker writes In the olden days, when monitoring a file system of a few 100 MB, we would be alerted when it topped 90% or more, with 95% a lot of times considered quite critical. Today, however, with a lot of file systems in the Terabyte range, a 90-95% full file system can still have a considerable amount of free space but we still mostly get bugged by the same alerts as in the days of yore when there really isn't a cause for immediate concern. Apart from increasing thresholds and/or starting to monitor actual free space left instead of a percentage, should it be time for monitoring systems to become a bit more intelligent by taking space usage trends and heuristics into account too and only warn about critical usage when projected thresholds are exceeded? I'd like my system to warn me with something like, 'Hey!, you'll be running out of space in a couple of months if you go on like this!' Or is this already the norm and I'm still living in a digital cave? What do you use, on what operating system?
Open Source

Ask Slashdot: Aging and Orphan Open Source Projects? 155

Posted by Soulskill
from the try-craigslist dept.
osage writes: Several colleagues and I have worked on an open source project for over 20 years under a corporate aegis. Though nothing like Apache, we have a sizable user community and the software is considered one of the de facto standards for what it does. The problem is that we have never been able to attract new, younger programmers, and members of the original set have been forced to find jobs elsewhere or are close to retirement. The corporation has no interest in supporting the software. Thus, in the near future, the project will lose its web site host and be devoid of its developers and maintainers. Our initial attempts to find someone to adopt the software haven't worked. We are looking for suggestions as to what course to pursue. We can't be the only open source project in this position.
Software

Ask Slashdot: Event Sign-Up Software Options For a Non-Profit? 104

Posted by timothy
from the which-con-do-you-mean? dept.
New submitter don_e_b writes I have been asked by a non-profit to help them gather a team of volunteer developers, who they wish to have write an online volunteer sign-up site. This organization has a one large event per year with roughly 1400 volunteers total.I have advised them to investigate existing online volunteer offerings, and they can afford to pay for most that I've found so far. In the past two years, they have used a site written by a volunteer that has worked fine for them, but that volunteer is unavailable to maintain or enhance his site this year. They believe the existing online volunteer sign-up sites are not quite right — they feel they have very specific sign-up needs, and can not picture using anything other than their own custom software solution. I am convinced it's a mistake for this non-profit to create a software development team from a rotating pool of volunteers to write software upon which it is critically dependent. How would you convince them to abandon their plan to dive into project management and use an existing solution?
Network

Ask Slashdot: LTE Hotspot As Sole Cellular Connection? 107

Posted by timothy
from the points-of-contact dept.
New submitter iamacat writes I am thinking of canceling my regular voice plan and using an LTE hotspot for all my voice and data needs. One big draw is ability to easily use multiple devices without expensive additional lines or constantly swapping SIMs. So I can have an ultra compact Android phone and an iPod touch and operate whichever has the apps I feel like using. Or, if I anticipate needing more screen real estate, I can bring only a Nexus 7 or a laptop and still be able to make and receive VoIP calls. When I am home or at work, I would be within range of regular WiFi and not need to eat into the data plan or battery life of the hotspot.

Has anyone done something similar? Did the setup work well? Which devices and VoIP services did you end up using? How about software for automatic WiFi handoffs between the hotspot and regular home/work networks?
The Internet

Ask Slashdot: Good Hosting Service For a Parody Site? 115

Posted by timothy
from the just-keep-backups dept.
An anonymous reader writes "Ok, bear with me now. I know this is not PC Mag 2014 review of hosting services. I am thinking of getting a parody website up. I am mildly concerned about potential reaction of the parodee, who has been known to be a little heavy handed when it comes to things like that. In short, I want to make sure that the hosting company won't flake out just because of potential complaints. I checked some companies and their TOS and AUPs all seem to have weird-ass restrictions (Arvixe, for example, has a list of unacceptable material that happens to list RPGs and MUDS ). I live in U.S.; parodee in Poland. What would you recommend?"
Open Source

Ask Slashdot: Stop PulseAudio From Changing Sound Settings? 286

Posted by timothy
from the sound-on-linux-still-frustrating dept.
New submitter cgdae writes Does anyone know how to stop PulseAudio/Pavucontrol from changing sound settings whenever there is a hardware change such as headphones being plugged in/out or docking/undocking my laptop ? I recently had to install PulseAudio on my Debian system because the Linux version of Skype started to require it. Ever since, whenever i dock/undock or use/stop using headphones, all sound disappears, and i have to go to Pavucontrol and make random changes to its 'Output Devices' or 'Speakers' or 'Headphones' tab, or mute/unmute things, or drag a volume slider which has inexplicably moved to nearly zero, until sound magically comes back again. I've tried creating empty PulseAudio config files in my home directory, and/or disabling the loading of various PulseAudio modules in /etc/pulse/*.conf, but i cannot stop PulseAudio from messing things up whenever there's a hardware change. It's really frustrating that something like PulseAudio doesn't have an easy-to-find way of preventing it from trying (and failing) to be clever.

[In case it's relevant, my system is a Lenovo X220 laptop, with Debian jessie, kernel 3.14-2-amd64. I run fvwm with an ancient config.]
Businesses

Ask Slashdot: Handling Patented IP In a Job Interview? 224

Posted by samzenpus
from the what's-mine-is-mine dept.
ZahrGnosis writes I'm in the midst of a rather lengthy job interview; something I haven't done for some time as I've worked as a contract employee with a much lower barrier to entry for years. Recently, I've started patenting some inventions that are applicable to my industry. One hope is that the patents look good to the prospective employer on a resume, but I don't want them to take the existing IP for granted as part of the deal. I'm worried I have the wrong attitude, however. My question is, how should I treat licensing of the patent as a topic with respect to the topic of my employment? Should I build the use of my patented ideas into my salary? Should I explicitly refuse to implement my patented IP for the company without a separate licensing fee? If I emphasize the patent during the interviews without the intent to give them the IP for free, is that an ethical lapse — a personal false advertising? At the same time, when I work for a company I feel they should get the benefit of my full expertise... am I holding back something I shouldn't by not granting a de-facto license while I work for them? I perceive a fine balance between being confrontational and helpful, while not wanting to jeopardize the job prospect nor restrict my ability to capitalize on my invention. Thoughts?
Books

Ask Slashdot: Best Books On the Life and Work of Nikola Tesla? 140

Posted by timothy
from the you-mean-the-ones-they-haven't-hidden-from-you dept.
An anonymous reader writes The internet is full of interesting nuggets of info about Nikola Tesla's life and scientific exploits: The time a young Tesla improved an electric motor for Edison, and Edison simply would not pay Tesla the monetary reward he had promised him earlier. The friction between Tesla and wealthy industrialist J.P. Morgan, and Tesla's friendship with (kinder) industrialist George Westinghouse. The 2 different times Tesla's main laboratory burned to the ground. The time a Tesla lab experiment reportedly caused a small earthquake to trigger in lower Manhattan. Tesla's (never quite fulfilled) dream of transmitting electricity across great distances without using wires or cables, etc. All this fascinating stuff, and more, about Tesla's life is out there, mostly in shortish snippets — and sometimes woven into outright conspiracy theories — on the internet for anyone to examine. Now to my question: What are the best books to read to get a fuller picture of Nikola Tesla's life and work? Preferably something well researched and factually accurate. Are there any good documentaries or movies (apart from David Bowie playing a wizard-like Tesla in "The Prestige")? Why is Thomas Edison so well known and covered in education/popular culture, and the equally prolific and ingenious Tesla a "mysterious and ghostly figure" by comparison?
Networking

Ask Slashdot: VPN Setup To Improve Latency Over Multiple Connections? 174

Posted by timothy
from the so-you-favor-internet-fast-lanes dept.
blogologue writes I've been playing Battlefield for some time now, and having a good ping there is important for a good gaming experience. Now I'm in the situation where I have mobile internet access from two telecom companies, and neither of those connections are stable enough to play games on, the odd ping in hundreds of milliseconds throws everything off. How can I setup a Windows client (my PC) and a Linux server (in a datacenter, connected to the internet) so that the same TCP and UDP traffic goes over both links, and the fastest packet on either link 'wins' and the other is discarded?
Education

Ask Slashdot: Capture the Flag Training 102

Posted by samzenpus
from the best-practices dept.
An anonymous reader writes "I'm a computer science professor and a group of students want me to help them train for a capture the flag competition. I am interested in this and I'm familiar with security in general, but I've never been involved in one of these competitions. Does anyone know of any resources which would be useful to train for this?"
IT

Ask Slashdot: An Accurate Broadband Speed Test? 294

Posted by timothy
from the works-fine-from-our-end-sir dept.
First time accepted submitter kyrcant writes Is there a way to accurately really test my "broadband" connection? I don't trust the usual sites, the first ones I found via Google. I suspect (and found) that at least some of them are directly affiliated with ISPs, and I further suspect that traffic to those addresses is probably prioritized, so people will think they're getting a good deal. The speeds I experience are much, much slower than the speed tests show I'm capable of. For a while I thought it might be the sites themselves, but they load faster on my T-Mobile HTC One via 4G than on my laptop via WiFi through a cable modem connection. Is there a speed test site that has a variable or untraceable IP address, so that the traffic can't be prioritized by my ISP (call them "ConCazt")? If not, which sites are not in any way affiliated with ISPs? Is there a way to test it using YouTube or downloading a set file which can be compared to other users' results?
Google

Ask Slashdot: How Would You Build a Home Network To Fully Utilize Google Fiber? 279

Posted by samzenpus
from the making-the-most-of-it dept.
kstatefan40 writes I am closing on a house next week which is connected to Google Fiber. I am ecstatic to have a gigabit connection, but the previous homeowner had them install the jack in an awful location. I'm going to be in a situation where I am paying for more than I can technically achieve over wireless. I have purchased a couple of 600mbps powerline adapters, but those still won't fully use the gigabit connection. Is there a better way to achieve a truly gigabit internal connection without substantial structural or wiring modifications?

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