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24,993 verified issues
What is the difference between a VLAN and a subnet?
I have read numerous forums and articles regarding VLANs and subnets. However, I haven't understood the functions of each apart from the following: Subnets allow the segmentation of a network VLANs are an isolated portion of a network Questions If I have multiple subnets I assume that you would need a router to communicate between each subnet. Only devices within each subnet would be in the local broadcast domain for that subnet. Is that right? Do I need a subnet to setup a VLAN? I am aware that a VLAN can exist within a subnet. But my understanding is that you would have to assign an IP address of that subnet to the VLAN. How can it be isolated from the rest of the subnet? When would you set up a VLAN? Especially if I am able to segment my network using subnets? I keep coming across the following point. However, I am unsure what this exactly means when it reads . Virtual local area networks (VLANs) allow us to create different logical and physical networks; whereas IP subnetting simp…
Force Chrome to open URLs as URLs, instead of searching
I have a local Apache server running, which is defined through as "apache". So I often open pages like: Normally, this works fine. However, since I am using a more recent Chrome browser, at odd moments the browser decides that the URL I type is not a URL but actually a search, so it loads my default search engine and tries to find this URL. It often, but not always, shows a link under the address bar that says . That is nice, but very annoying having to click here instead of going there directly. What makes Chrome behave this way? Can I fix this?
Can some software physically damage hardware?
I know a question similar to this one has been asked before however it was about installing a 32bit OS on a 64bit laptop. My question is more about damaging the hardware. I was wondering if there was a way of interfacing with hardware from the OS or Terminal layer in a way to damage it beyond repair (actual physical damage, not just faulty hardware). Could you bypass security measures and run a CPU so hard that the ceramic actually breaks? Could you write or interface with a HDD in a way that would cause physical damage to the platters? Could you mess around with memory and fry RAM? Can you blow a NIC? I'm interesting in knowing the limit to which the software can reach when looking at a system as a whole.
How can I dim my computer screen beyond the minimum?
I usually just use Fn + Left or Fn + Right to adjust my screen's brightness but the minimum settings are still too bright for me (especially when I'm working at night). I tried going through the Power Options in the Control Panel (plan brightness already at the lowest settings). Is there a way to dim my laptop's screen beyond the minimum? I'm already using Fl.ux. I was wondering if there was a utility similar to it that adjusts my screen's brightness/contrast instead of its color temperature.
Do I need to have a passphrase for my SSH RSA key?
Before I started at my current job (at a small business), my office had no firewall on the network and literally nothing was ever being backed up. Now that I've signed on as a dedicated sysadmin / one-man-IT-department, I've been doing what I can to change this. After explaining to my boss how vulnerable we were, he's allowed me to set up some backup servers, one of which is at his house. Right now, I'm trying to get everything set so that I can automate daily backups. I am planning to use rsync through ssh to do this. For security's sake as well as for ease of automation, I was planning to disable ssh password login and only use rsa key validation. Well, if I have an rsa passphrase set, then I would still have to enter a passsword, and that's a problem. Does not having an rsa passphrase make things significantly less secure? I'm the only person in the company who has any sort of a clue about this kind of thing, so I'm not too worried about someone calling up a terminal on my machine …
What is the Windows analog of the Linux watch command?
I'm looking for a Windows program/script/command line function that works like Linux's program. periodically calls another program/whatever and shows the result, which is great for refreshing an output file or similar every second: or, more powerfully: I've looked for it in cygwin's library, but it doesn't seem to be present.
Is it safe to install both Homebrew and Macports on the same machine?
I have MacPorts installed on my iMac with a fair number of ports installed. I'm interested in trying out Homebrew, though, as I've heard many good things about it, and because I've noticed that it contains more up-to-date versions of several of the tools that I use. But can the two coexist on the same machine, or do I need to uninstall MacPorts entirely first? Also, if the two can be installed at the same time, will they be completely independent of each other? One of the features of Homebrew is that is doesn't reinstall new versions of things which are already included in the system (e.g. python). Does this also extend to it not installing versions of things which are already maintained by MacPorts? What happens if I then subsequently uninstall MacPorts?
Run cURL commands from Windows console
Is there a way to install in windows in order to run commands from the command prompt?
How do you mount a directory as a drive in Windows 7?
I have a directory on another drive that I want to show as a new virtual drive. How can I do that?
Is it possible to convert virtual machines to physical environments?
Is is possible to convert a .vdi file into a .iso that can be burned to a cd or dvd and make it like an installer. Or Is it possible to convert virtual machines to physical environments?
Moving a window from a disconnected monitor to connected monitor on Vista
I have a laptop that runs Vista Mega Ultimate Amazing for Business 64-bit. When at work, I connect a monitor via USB (which totally rocks) to the "left" of the laptop monitor. It's identified as monitor 3. At home, I use an old CRT monitor that sits to the right of the laptop monitor. It's monitor 2. Monitor 1 is, of course, the inbuilt laptop monitor. Now at home I open a window, any window, on monitor 2. Then I come to work and plug in monitor 3. Anything I had open on monitor 2 is now stuck in unretrievable land. (Actually, it's probably anything that was minimised when I left home that belonged on monitor 2 will expand back onto monitor 2, even though it's disconnected) How can I get those windows back onto connected monitors?
How do I remove an SSH forwarded port
I used to establish port forwarding but now I need to remove it. How do I do this?
How can I stop Mac OS X overriding my hostname when I receive a DHCP request on Snow Leopard?
Whenever I go on a network where the DHCP server assigns hostnames then it overrides the settings I've set for my hostname on my Mac in the "Sharing" section of System Preferences. How do I stop this behaviour from occurring and always have the same hostname set under Snow Leopard?
What do ALSA devices like "hw:0,0" mean? How do I figure out which to use?
I've searched over and over and can't find any explanation of what "hw:0,0" means. How do I determine the number of my USB audio card? MPD requires me to enter something like this: If I do "alsamixer -c 1" it opens the USB card's volume control, but that really doesn't help me. Where can I find a list of device names/numbers on my system? Are they resilient to hardware changes? If I remove card 2, does card 3 become card 2? Are there other ways to identify devices? Where can I find documentation for any of this?
Can I force Google Chrome to remember passwords?
Is there a way to force Google Chrome to remember passwords for sites that have autocomplete turned off? Clarification: I am a programmer, but ideally, I'd like a method that I could help regular users implement, too.
Why does Windows only show about 3.5 GB of my 4 GB of RAM?
I recently upgraded my computer's RAM to 4 GB. My 32-bit Windows installation shows only 3574 MB of the memory. How can I make Windows use the full amount of RAM?
How can I run an application with command line arguments in Mac OS
Is there any easy way to append command line arguments to an application on a Mac? For example, to run Opera in kiosk mode or to use a different profile in Firefox, I can type In Windows I can append the arguments to the shortcut properties, but since Macs don't use shortcut per se and run the applications directly, this isn't possible. I have found that launching the applications through bash or Applescript partially works: I can make these executable and assign an icon and everything works great except that when I run either of these pseudo programs, either a terminal window or an Applescript icon remains open as long as the application is open. Presumably, using the Applescript command would avoid this, but since I'm not running the application as it is packaged (just ), it doesn't work. So, is there a better way to run applications with command line arguments? If not, is there a way to prevent a persistent terminal session or Applescript icon from staying open while the applicatio…
How to remove items from the right click (context) menu in Windows?
The right click (context) menu is minimal and clean on a fresh installation of Windows. Install a bunch of applications and soon the context menu is loaded with all kinds of opening options from various applications. How do I remove items from the right click (context) menu? I find that there are different types of right click menu items: Global items that appear in all context menus. Items that appear only on folders. Items that appear only on files. Items that appear only on special folders (Ex: Right clicking a folder of MP3s shows up a context menu with items like Play with Windows Media Player.) Items that appear only on certain file types (Ex: Right clicking a MP3 file shows up a context menu with items from Windows Media Player/Foobar2000/VLC/your-favorite-media-player begging to open this file.) I want to be able to delete all these kinds items from the right click (context) menu.
Deleting a specific URL suggestion in Chrome
In Firefox, I can use Shift+Delete to delete a single item from the URL history (the URL suggestions). How can I delete a specific mistyped URL item (only one) from the history in Google Chrome, so it won't show up as a suggestion?
How do I view source in Outlook 2010?
This question has already been asked here; but the answer only gives advice on how to view the email header not the actual html source of the email. There is another question here, which I think may be caused by the same issue as mine, but does not have a satisfactory answer (the answer does not work for the person who posted the question) If I right click on the bottom of an email I can see the option to 'view source' but when I select it nothing happens. I have done a bit of research and came across a post for a much earlier version of Outlook that suggested adding something into the registry. I applied this advice, but it made no difference; but I'm pretty sure that applying this solution correctly for my circumstances will do the trick. When I first received this machine it had a demo version of UltraEdit installed. I uninstalled UltraEdit and installed Notepad++ instead. I am convinced that there is a registry entry that is pointing to UltraEdit as the default view for 'view sour…