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• What is Slotted and pure aloha?

  - by caspert

  So I am having a really hard time understanding slotted and pure aloha. I have understood CSMA/CD fairly well, but that is it. I have the book: Computer networking - a top down approach, but I find the explanation very cryptic and hard to understand. Wikipedia did not help me. Does anyone have a brief "aloha for dummies" explanation? or perhaps a video tutorial? I think I need something visual. I don't need to be able to create the protocol, I just need a general understanding of it.

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• Remote Desktop AND monitor fail on restart (Win2008R2)

  - by Wesley

  I am in the process of building a small 3 server farm. Each machine is running Window Server 2008 R2. As is normal, I am in the process of installing patch after patch to bring the machine up to snuff. Every time I restart the machine, or most every time, when I try to remote in to the machine I get the Log In window, but then almost immediately I get the message that my remote session was ended. If I physically walk over to the machine and plug in a monitor and keyboard, I see nothing. If I leave the keyboard and monitor in and restart the machine by force, the computer reboots just fine. When windows starts, I get no error message about windows not starting or being shut off unexpectedly. Once I log into the machine physically by the keyboard, I can then remote in to the machine at that point. Very confused. This happens on all 3 machines, these machines have different hardware.

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• Windows 7 Laptop, cursor jumping after typing the letters "y" or "t" [closed]

  - by Dave K

  My wife has an HP laptop running windows 7. She has a very frustrating problem when typing: in some, but not all cases, typing the letter's "y" or "t" will cause the cursor to jump back a few lines or some number of words. The result is that she ends up typing over whatever it was that she was working on. (as a matter of fact, I just experienced this while typing this question on her computer with the phrase: "typing the letter..." above.) I've installed the latest drivers for her touchpad from Synaptic and disabled tap touching and gesture features to rule out simple unintended mouse clicks. Still the "y" and "t" keys continue to cause problems.

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• Setup for NEW HDD?

  - by Ed Markey

  Building my FIRST computer. Will start with at least - one HDD, I purchased a WD SATA HDD a 10,000RPM VelociRaptor 500GB. I have read that if you use one of the settings, can't remember what it's called, that it would make an HDD rund at IDE speeds??? Could I or should I run it in RAID instead? Is RAID only for more than one HDD/ssd? I would like to get like a 64GB SSD later to maybe speed things up working together. Thanks

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• DELL U2410 Monitor(Display Port) & Graphic card

  - by Anj

  I was looking for a 24" monitor and bought the Dell 24" inch ultra sharp monitor which has DisplayPort( new keyword for me) seems it is equivalent to HDMI. Now I would like to enhance the display capabilities for my laptop and desktop(both have VGA output as of now). Couple of questions in mind: Is there a single HD graphic card which i could use for both desktop and laptop? I understand it has to be external but if its costly then I would stick on internal graphic card for my desktop. Please recommend external if its cost effective else I would go for internal one(Budget is around $70 or Rs 4000. Is there a HD card which I could use for both HD video and 5.1 channel audio output? I generally use the computer for office work/ listening music and watching movies, not gaming.

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• Windows 7 spins up HDD when files should be on SSD

  - by ZorroDeLaArena

  I run 64-bit Windows 7 Ultimate off a Corsair 12GB SSD (cmfssd-128gbg2d) and I've got two older HDDs I use for storing media. However even though the operating system and all the programs are installed on the SSD, frequently when I'm starting programs, I can hear the computer spin up one of the HDDs before the app starts and I'm not sure why (and I don't know which drive it is). For programs that should open very quickly - Programmer's Notepad, Calculator (the basic one that comes with Windows), etc. - having to wait several seconds sometimes can be pretty obnoxious. Avoiding wait times like that are why I got the SSD in the first place. Is there any way to tell why that's happening? I'm happy to provide more information but I'm not sure what's important. Any help would be really appreciated!

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• Red Hat 6.5- sysctl -w net.ipv6.conf.default.accept_redirects=0

  - by kjbradley

  I am in the process of writing a Red Hat 6.5 Kickstart disc with hardened security. I have run a program to determine where the weaknesses are in my system, and apparently there is a medium severity problem by accepting IPV6 redirects. When I implement the following line in my post script in my kickstart, I can't access any websites externally with wget, or ssh/scp in from my computer. sysctl -w net.ipv6.conf.default.accept_redirects=0 Is there a workaround to this so that the system will still be hardened but I will be able to access systems that are external?

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• How can I get the comment of the current authorized_keys ssh key ?

  - by krosenvold

  Edit: What I really need to know WHICH ssh key from authorized_keys has been used to identify the currently logged on user. According to "man sshd": Protocol 2 public key consist of options, keytype, base64-encoded key, comment. I see that when I use ssh-keygen, the comment is usually the local identity of the user. Is there any way to access this value when I'm on the remote computer ? (Kind of like the SSH_CLIENT shell variable) (Assuming I enforce the comment to be a remote identity of some sort, I would like to log this from a shell-script! This is on ubuntu)

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• Lenovo ThinkPad W530 problem to activate the optical/DVD drive

  - by Marko Apfel

  Problem Sometimes my notebook shows the optical drive as power off: But the hint there is not changing this state. Solution By looking in the device manager you see the next problem: So open the properties via right mouse click. This gives you the hint to remove the drive first. “Windows cannot use this hardware device because it has been prepared for "safe removal", but it has not been removed from the computer. (Code 47)” Whether you select the comment by dragging the mouse over the the hidden part or pressing the button “Properties”. So we unplug and reinsert the ultrabay. If you think, now the system is working – you are wrong. Now the system is the meaning, that the ultrabay is unplugged. You could verify this by refresh the view in the device panel. Now there is no longer our device. Yet your great gig comes – unplug the ultra bay and reinsert it a second time! After this you could hear with a media inside, that the motor is really started and we have a working device What a difficult birth …

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• Portable VirtualBox with Ubuntu on two machines

  - by eactor

  I have VirtualBox Portable installed from vbox.me. I moved it on a USB drive and added a virtual Ubuntu. It works fine on the computer I created it, but moving the usb drive to a different the Ubuntu does not start any more. I already changed location descriptions in <machine>.vbox and the VirtualBox.xml. When pressing Shift while starting the GRUB loader comes up, so I tried the recovery mode. Same here – startup freezes and nothing happens. Any hints for me? Last to happen in log file: 00:00:54.986 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=06aac000 w=640 h=480 bpp=32 cbLine=0xA00, flags=0x1 00:01:06.361 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=00000000 w=720 h=400 bpp=0 cbLine=0x0, flags=0x1

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• How do I edit files in the console when connecting to windows 7 via ssh?

  - by Alex Waters

  I am using tunnelier client and server to connect to a windows machine. I can get in and have access to all of the files on the computer. I have vim installed on that windows machine, but I can't seem to edit anything via the DOS command line. I also tried editing in notepad, but nothing happens when I enter the command. I think this might be the part where DOS doesn't behave like bash. Would I need to setup cygwin / openssh to accomplish this? (boo, tunnelier is so easy) Thanks! p.s. I know I could just use sftp and edit files that way, but it feels dirty.

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• Where do I find a free (open source preferably) VNC management tool?

  - by thenior

  Hello, I am trying to get remote internal setup for our business. Basically, I just want to remote desktop into any computer on the network. I don't want to use LogMein, because I only want it to be internal for security. Basically, I am looking for a way to just install VNC clients on all the machines, and on my machine have centralized manager for all the machines that are connected to it. Doesn't have to VNC - just needs to work and be free. All systems running Win 7 64bit

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• Run BGInfo At Startup For All Users

  - by slickboy

  I have a Windows 7 image which I intend to deploy across a business. For simplicity I intend to install BGInfo on each machine and have it update each time a user logs in. From what I can see, when BGInfo creates a configuration file, the file contains variables which are local to each account - and therefore the configuration file will only work on the user account that created it. Has anyone any idea as to how make these configuration files 'generic' so that BGInfo will work for all accounts when they log in? At present I have the BGInfor application and a BGInfo configuration file saved on the C drive and I have written a batch file which is stored in the 'All Users/Start Menu/Startup' directory (which executes every time any user on the computer logs in), however this only works for the account which created the configuration file. Thanks for any help.

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• Monitors blank after restart [closed]

  - by offler

  i need help on the following issue. We have Dell T1650 PCs with 2 nvidia graphic adapters / Windows 7 and 4 attached monitors. At initial start all screens are blank, the computer does not show anything. If powered off by pressing the hardware power button and then restarting all monitors show a picture. The Windows event log shows only the errors, that the machine was shut down unexpectly. The last entry with blank screen seems to be that user specific dlls for every application are loaded. How can I find out the real problem?

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• How do I get a static IP address for my teapot?

  - by Joe

  I maintain this teapot: It returns a 418 error when it is pinged, and it is pinged regularly by people arriving from the relevant Wikipedia page. (For those interested, and there appear to be a few of you, the relevent story is here) It sits on a shelf in my office in the Computer Science department of a university and the support guys were kind enough to give it a dedicated IP address some years ago. My contract is coming to an end in the next few weeks and it's occurred to me that I'm going to have to do something with the teapot. I'd like to take it home but I have no clue how to explain to my home broadband supplier that I want a dedicated IP address coming to my house so that people can ping a teapot. Is there a reasonable way of having a server on a shelf in my house that people can ping via an IP address? What search terms can I use to find a solution to this problem?

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• How to rsync just the current folder?

  - by Michael

  I want to sync some files from a remote server to my local computer. How can I make rsync to just copy the files with a certain file extension in the directory but no subdirectories? I assumed this to be an easy task, but embarassingly I'm not getting it for nearly 2 hours. So could someone give me an example? I did various experiments with something like the following command: rsync -a --include=what? --exclude=what? -e ssh [email protected]:/test /test

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• Is IMAP (un)subscribe meant to work accross mail clients?

  - by equaeghe

  I read my IMAP-mail on different computers/mail clients. I wanted to unsubscribe from the majority of my folders in Outlook. Later, I noticed that on another computer, where I use Thunderbird, I was also unsubscribed from those folders as well. This is not what I wanted (at all), so I subscribed again under Thunderbird. The effect was that I also got subscribed again under Outlook. So I guess this means (un)subscribing to IMAP folders is an account-coupled thing, not a per-client thing. Is there a way to achieve (un)subscribing per client?

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• Unable to run Django on Mac OS X

  - by cybervaldez

  I'm working with a Django project on my Mac (running Leopard) and I want to show it to my team. I've already passed the neccessary port forwards from my router to my Mac's LAN IP address but it doesn't work. I've also tried running the XAMPP server since that always worked with my Windows XP computer but it still doesn't work. Whenever I type my > it's showing a Page Load Error. Is this possibly an issue with an Mac OS X configuration that I need to setup first to allow my port forwards to get in? It's my first time to do this with Mac, perhaps I need to configure something else in network preferences?

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• How to removeTrojan PB [duplicate]

  - by user266901

  This question already has an answer here: How do I get rid of malicious spyware, malware, viruses or rootkits from my PC? 15 answers How to remove trojan PB from windows 7 system? previously i had installed Norton 360 antivirus. the subscription was expired two months back. Recently i have purchased quick heal total security. while installing quick heal antivirus i get the message 'system infected by Trojan PB' Their is an option to remove Trojan PB by restarting computer. However the infection does not get removed. Please advice for removal of Trojan PB

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• Cannot find GRUB - Ubuntu/Windows 8 dual-boot

  - by ubeatlenine

  Hello Ubuntu community, I find myself in an interesting situation. I have a Dell Inspiron 531 with Windows Vista. Recently my brother decided it would be a good idea to overwrite Vista with the Windows 8 consumer preview. Since we have had this PC for a very long time, we have long since lost the Vista CD, and according to the Windows 8 preview website you cannot recover your previous OS without it. I thought this would be a good opportunity to try out Ubuntu (since we obviously cannot keep the preview as an OS), but it appears that Ubuntu 11.10 Desktop is not compatible with Win8. Ubuntu doesn't run from the LiveUSB I made, instead it freezes on the loading screen and then disintegrates into black and white stripes. I blamed this failure on Ubuntu not being compatible with win8 yet and tried to install Ubuntu from the USB on a partition made from the remaining space on my hard drive - about 100GB. However the installer crashed while loading modules and told me I didn't have enough disk space. Since then, I have not been able to load either Ubuntu or Windows, BIOS is shifted over to the left of my screen, and I always get the same message: error: unknown filesystem grub rescue> typing "ls" at the prompt gives me the following: (hd0) (hd0,msdos7) (hd0,msdos6) (hd0,msdos5) (hd0,msdos2) (hd0,msdos1) does this mean I have multiple partitions running windows on my computer? Is it possible to recover Vista without the disk? Are all of my problems stemming from Ubuntu not being compatible with Win8 preview? (I realize the majority of my questions are about Windows, but seeing as the prompt I get is for grub I thought I would ask here first.) Any insight anyone has on this predicament would be greatly appreciated.

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• How can I run a jar on a domain server?

  - by acuddlyheadcrab

  Sorry, I'm not very experience with web development so I don't know the correct names for everything. I only have FTP access to my server, so I'm hoping that's all I'll need. I could do this easily on a windows computer, via .bat files (I know how to use .jar files), but, like I said, I only have FTP access, so I don't know exactly what to do. Would this involve a script? Could I just use a .bat file somehow? Or maybe php?

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• Making application listen to port

  - by dplanet

  I am running an Ubuntu guest machine through my Windows 7 host machine (with Virtualbox), and on the Ubuntu system running an application that uses port 6969. Through configuring the Virtualbox port forwarding settings I have made it possible that I can go to 127.0.0.1:6969 in my browser and see the application's default page. However, I'm wondering how I can port forward from my Windows 7 machine to the whole network. My local network (IPv4) address is 192.168.0.5. I want to be able to go to 192.168.0.5:6969 from any computer on the network and see the application. I've searched Google but can only seem to find solutions in Linux, not Windows. How can I do this?

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• Windows Server VPN: Error 720

  - by Nikita Zernov

  I want to created vpn server on Windows Server 2012. First I installed Active Directory domain services, then Remote Access server role. Opened Gettng Started Wizard, entered configure just vpn. Then in Routing and Remote access selected Configure and Enable Routing and Remote Access. There selected custom configuration, vpn. Then created user in active directory and allowed network access permission. After this I tried to connect to vpn from windows 8. I get the following error: Error 720: A connection t the remote computer could not be established. You might need to change the network settings for this connection. What should I do?

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• How come there is still so much programming work?

  - by jd_505

  I wonder why programming jobs haven't yet "dried up" because of the software evolution, for example, I am a developer myself, which means that I do care about software (I mean I am not of the type of guys that needs a computer mainly to just browse the Internet), and still I wouldn't mind if I never receive any more updates on my Ubuntu machine. I find that it provides everything I need, and while the updates provide various bug fixes/improvements, I wouldn't mind using it with its current state for the rest of my life, for 2 years of Ubuntu usage I have never bumped at a serious bug/problem. Another example is Windows, almost half of it's users still use XP, which is practically ancient, yet they find it satisfying all their needs (and I agree with them). I could go with many more examples, but by now you are understanding my point and my question. While new "trends" appears all of the time (like a new mobile OS) which runs on new platforms and requires some fresh development work, still the majority of the software effort goes in to what I consider as "completed projects", or at least a state of a project which is enough to be considered as completed. Do you have an explanation? I can't think of the right tags for this question; please edit it the way you find it to be most appropriate.

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• Do I have a bad video card?

  - by zooropa

  I think this is the right spot to post this question. Please don't flame me if it isn't. My work computer is a Dell Prescision M6400 laptop. I use the VGA output to a second monitor. There is something wrong with my second monitor's output. Here is a screenshot of my desktop. You can see fragments of the right side of a Windows File Explorer window in the image. Is this a bad video card?

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