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Articles indexed Wednesday August 29 2012

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• How does IPv4 Subnetting Work?

  - by Kyle Brandt

  This is a Canonical Question about IPv4 Subnets How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? What is NAT (Network Address Translation).

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• What IT certification is most valuable without job experience? [closed]

  - by Eric Wilson

  I'm trying to change vocations towards IT. I'm learning JAVA, SQL, and other things, but I have no job experience or formal education (other than a math Ph.D.) I know that certifications only go so far, but I was curious which certifications might be the most valuable for a first IT job? To clarify my question: Oracle certification + Zero Oracle experience = 0% chance of Oracle DBA job. Perhaps, though: [foobar certification] + Zero IT job experience = nonzero chance of entry IT job? Please give specific suggestions of certifications that you would consider relevant towards an entry-level IT job.

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• Web connection speed issue

  - by Iroll750

  I encounter a strange issue with my web (wireless) connection on my laptop (Ubuntu 11.10) I'm able to have 540kbps (down) on all computers in my house (including laptop at the same distance from the box) except me. When i do a speed connection test, i can have this optimal speed immediately after booting. As i surf on the net, watching videos, download things, etc... it becomes slower progressively until 100-110 kbps and the speed remain the same until i reboot. I tried to figure out if a process consume bandwith in background with nethogs but i found nothing suspicious. Any ideas ? Thanks in advance for your help !!

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• Installing drivers and getting -> Error Code 28

  - by Adrov

  I've recently upgraded mainboard, without reinstalling OS, so I guess that's the issue. I really don't want to install OS at this moment. Issue is I can't install USB drivers, if I right-click uninstall, just installs same driver, which isn't working ofc. and giving error code 28. I fixed such issue once long long time ago, with editing registry, but I really can't remember what and where I have to do, so if anyone know please let me know, I'm also open to all other solutions to this issue. http://i.stack.imgur.com/AuBtB.png

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• blocking port 80 via iptables

  - by JoyIan Yee-Hernandez

  I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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• NNTP-via-SMTP software

  - by Thufir

  I see that mailman can operate as gateway: Try mailman. Create a new list for each newsgroup that you read and then configure the lists as mail<-news gateways. Subscribe yourself to the lists. Viola. Instant NNTP-via-SMTP. http://lists.debian.org/debian-user/2003/08/msg00522.html What alternatives are there to mailman for this functionality? I see that others have asked this, or something similar.

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• Standby Internet connection by means of 3G Modem if Internet Fails

  - by Sarah Boss

  In my office I have 4 computers connected to the Internet with a DIR-615 Wireless N 300 router which gives Internet to all pc's via Ethernet cable. But sometimes this Internet goes off and I have to call the ISP and it takes them 2 days to repair it. I wanted to know if in such cases, can I connect my two zte 3g usb modems to this DIR-615 Wirless N300 router and get emergency Internet in my office? What other steps are required to set up this fail-safe connection?

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• Decrypting a TrueCrypt drive pulled from another machine

  - by Blakeg08

  I work in a corporate environment and we are now required to encrypt laptops. I have already encrypted about 5 or 6 out of 40. I still have a few questions before we go all out with TrueCrypt. Can I decrypt a hard drive by plugging it into my desktop using a data transfer kit? I tried this and the hard drive showed up asking me to format before using the volume. If I have the TRD from each laptop backed up do I still need to backup the volume headers? What else do I need to back up? Thanks.

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• Removing partition to install OS?

  - by Shane

  So i have a computer that has 2 hard drives and i installed Ubuntu server on it. I used LVM to connect the two. So i tried to put windows back on it but it failed because it said it couldn't position the drive and then when i booted again the OS couldn't be found. So i booted it with the Ubuntu setup disc but now when it goes to partition it says that the position can not be modified because its already in use. I am asking if there is a way i can just remove everything and start fresh?

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• Prevent Cisco VPN from interrupting home networking

  - by jkohlhepp

  I just got a new laptop, and for the most part have left its settings alone. Today I was trying to get some sharing going between my desktop and the laptop. Both machines are connected to the same wireless network and both machines consider that network to be a Home network. Both are running Win7 Home Premium. It seems like my laptop is aware of my desktop on the network. It can ping it by IP or by computer name. When I go to Network from the laptop, I can see the desktop in the list of computers. However, my desktop cannot ping the laptop, nor can it see it within Network. My desktop has a Homegroup set up, but my laptop says "There is currently no homegroup on the network". I do have network discovery turned on for both machines. Why can my desktop not "talk" to my laptop but it works the other way around? Update: Disabling the Windows Firewall on the laptop somewhat fixes the problem. With it disabled, my desktop can ping my laptop, but still my laptop can't see the homegroup. Also, it can ping via hostname, which resolves to IPv6, but can't ping via the IPv4 address. Obviously I'd rather not leave my firewall disabled, so I need a more specific fix. Update 2: Aha! It is the Cisco VPN software I was running to connect to work computers. Once I disconnected and exited from that, the two PCs seemed to be talking normally and the homegroup was visible to the laptop. So now my question has morphed: how can I prevent Cisco VPN from interrupting my home networking?

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• Strange behavior of excel 2007 on WinXP

  - by bdecaf

  I'm on a machine that had quite some bloat ware and no update in ages. I made all the updates, removed the bloatware and cleaned using ccleaner. So far so good. Now excel shows some really strange behavior when I open .xls files through windows. The current behavior is: it opens a new excel process window which will then stay empty. One has then to drag the xls file into the window to open it. I would like to restore the default behavior. So far I have tried: running the Microsoft Office Diagnosis copied excel related registry keys from a machine with working excel and imported them had a look into the registry entry for .xls files myself - which seems correct. It was of no use and I'm out of ideas. I would try to avoid a reinstall as we have a very bureaucratic IT department and the machine then would be gone for some undetermined time period. So any idea what to do would be great.

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• How to disable internet access at night on the router?

  - by izb

  I have an internet connection that I'd like to be enabled only during the day. With multiple household internet devices, this would need to be something disabled at the level of the router. I don't believe the router offers this sort of functionality, but I'm reasonably familiar with setting up web servers and the like, and I'm wondering if I can set up some sort of proxy server on the internet that the router must go through and have that proxy only active at certain times of day. It's a bit vague I know, but is something like this even possible? If not, are there other solutions to the problem?

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• Video desktop recording and multiple WM displays, capturing nonactive display

  - by okobaka

  Two WM running on one local machine. WM - Fluxbox. Using ffmpeg to record desktop. ffmpeg -an -f x11grab -s 1920x1080 -r 25 -i :1.0 -sameq /tmp/video.mkv On one display everything works great, but not when i have another WM display startx -- :1. What i am doing right now is to switch ctrl+alt+f8 to display:1.0, and start recording with ffmpeg. Everything is fine until i switch back ctrl+alt+f7 to display:0.0, WM and captured video image freezes, but when i switch back ctrl+alt+f8 to display:1.0, it unfreeze and continue recording. So, how to make display:1.0 not to freeze, while on display:0.0? Tested some more. open [display 0.0] open [display 0.1] from [display 0.0] = open => [display 0.2] same problem For different users and same users results are the same. ffmpeg keeps recording that paused image. Looks like WM root window need to be active, to be recorded.

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• Logitech bluetooth audio receiver quality

  - by lietus

  I bought a Logitech Bluetooth Audio receiver, and have run into a problem: When playing audio, it contains short hisses/clicks on higher tones or vocal+heavy instrumental music (Sound quality appears to be unclean). I'm not sure what could be the reason, but this only happens when I play from certain devices. My laptops (a Dell XPS Win7, and an Asus Eee seashell Win7) and my phone (Samsung Player 5) both have the problem. However, when I tried using a Samsung S2 phone, the audio was crystal clear. Seems that this could be something with Bluetooth transiting device.. Has anyone encountered a similar problem?

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• Scientific calculator app/site that saves calculations for Win 7?

  - by verve

  Are there any scientific calculator apps that aren't browser specific that's easy to use which displays whatever is inputted clearly and one that can be used by a keyboard only but can be used by only a mouse too? Also, I want one that saves the history of calculations and lets us paste it into a document at another time. Also, please don't recommend ones from sketchy-looking sites. Freeware or paidware. I prefer paidware if it's the only way to guarantee accurate calculations. Win 7 Pro.

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• Group policy doesn't let me execute Chrome (Win 7)

  - by George Katsanos

  where I work the admins just migrated us to Windows 7. They gave me admin rights but still I had to "run as administrator" my Google Chrome installation. After I managed to install it, I realized I even have to go through the 'run as administrator' shortcut every time I have to execute the application. I even edited the properties of the shortcut to check 'always run as administrator' but nothing changed. The message I get when I'm trying to launch Chrome is "This program is blocked by group policy. For more information contact your system administrator"... Is it something I could work out alone or I have to convince them to change the " policy " ?

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• Soluto’s New Quick Question Button Makes Family Tech Support Simple

  - by Jason Fitzpatrick

  Soluto, a computer and boot management tool, now features a Quick Question button that allows the people you help out to easily click a button and send you both a short message and a screenshot of the problem. Any time your friend or family member presses F8, Soluto will take a screenshot of the screen, the Task Manager history, and a note from the user highlighting what issue they’re experiencing, and then email it all to you. After reviewing the email you can easily login to Soluto to remotely manage your friend’s computer and help with the problem. For more information about Soluto you can check out our previous reviews of the service here and here, or just hit up the link below to read more and take Soluto for a test drive. Soluto is a free service (for the first 5 computers), Windows only. Introducing Quick Question [The Soluto Blog] Java is Insecure and Awful, It’s Time to Disable It, and Here’s How What Are the Windows A: and B: Drives Used For? HTG Explains: What is DNS?

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• Classic UFO Identification Chart from March 1967 [Retro Image]

  - by Asian Angel

  If you love classic sci-fi goodness, then you will definitely enjoy looking through the various ‘alien’ starcraft featured in this classic chart from yesteryear! View the Full-Size Version (914*1280 pixels) UFO Identification Chart – Stargods Blog [via Cheezburger.com] Java is Insecure and Awful, It’s Time to Disable It, and Here’s How What Are the Windows A: and B: Drives Used For? HTG Explains: What is DNS?

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• The Inebriator: A DIY Arduino-powered Cocktail Machine [Video]

  - by Jason Fitzpatrick

  We’ve seen our fair share of geeky alcohol-related projects over the years but this, this, is something to see. The Inebriator is the slickest automated drink machine we’ve laid eyes on. Before we even start talking specs, check out the video above–don’t forget to first assure your liver that you don’t actually have access to such a magnificent device and it can remain calm. As dazzled as we were? The whole thing is powered by an Arduino Mega 2560, sports a cooler with nitrogen pressurization of drink mix bottles, and relies on a rather ingenious and elegantly simple 12v valve system. It even has an RFID security system to prevent party goers with a few drinks in them from messing up the custom drink menu. Hit up the link below for more information, including photos of the guts and technical specs. The Inebriator [via Hack A Day] Java is Insecure and Awful, It’s Time to Disable It, and Here’s How What Are the Windows A: and B: Drives Used For? HTG Explains: What is DNS?

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• How To Prevent Your Computer From Waking Up Accidentally

  - by Chris Hoffman

  If you find your Windows computer waking from sleep for no apparent reason, your computer is either being woken up by a hardware device – such as your mouse — or scheduled task set to wake your computer. In some cases, the cause may not be obvious. For example, if your laptop occasionally wakes up for no apparent reason, it’s possible that the floor is shaking a bit, causing the mouse to vibrate slightly and wake the computer. Java is Insecure and Awful, It’s Time to Disable It, and Here’s How What Are the Windows A: and B: Drives Used For? HTG Explains: What is DNS?

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• Qu'est-ce qui vous a le plus surpris lors de vos premiers pas en entreprise ? Un développeur donne le top 5 des choses l'ayant stupéfait

  Qu'est-ce qui vous a le plus surpris lors de vos premiers pas en entreprise ? Un développeur donne le top 5 des choses l'ayant stupéfait Pour ses premiers pas en entreprise, surtout lorsqu'on est passé par très peu de stages, on est très souvent face à plusieurs éléments qui nous étonnent par rapport aux attentes qu'on avait du monde du travail. Henrik Warne, un développeur senior partage dans un billet de blog son top cinq des surprises qu'il a eu lors de ses premières années de travail, par rapport à la formation qu'il avait reçue. Voici une synthèse de celles-ci : 5 - L'interaction avec les personnes À force de passer du temps devant son ordinateu...

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• Java : fusion approuvée des éditions SE/EE/ME, la gouvernance du langage remaniée, vers plus d'équité ?

  Java : fusion approuvée des comités exécutifs des éditions SE/EE/ME La gouvernance du langage remaniée, vers plus d'équité ? [IMG]http://adiguba.developpez.com/blog/javacup.png[/IMG] Avec quatorze votes favorables et une abstention de Google du comité exécutif (EC) de Java SE/EE, seize Oui et deux abstentions de RIM et AT&T du comité de Java ME, la fusion des comités exécutifs de Java SE (Standard Edition), Java EE (Entreprise Edition) et Java ME (Micro Edition) vient d'être approuvé. Le JCP (Java Community Process) Document passe ainsi à la version 2.9. Le comité exécutif est un groupe de membres qui guide l'évolution de la technologie Java au sein du JCP. Il...

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• SkyDrive : Microsoft sort l'application Android pour son espace de stockage Cloud compatible Windows, Mac, iOS et Windows Phone

  SkyDrive : Microsoft sort l'application Android pour son espace de stockage Concurrent de DropBox et de Google Drive, également disponible sur Windows, OS X, iOS et Windows Phone Chose promise, chose due. L'application pour Android de SkyDrive, le service de stockage Cloud de Microsoft, est arrivée. Plus besoin de passer par le navigateur et de se connecter au service Web pour synchroniser et/ou sauvegarder des documents avec cet outil. Pour mémoire, SkyDrive est la plateforme Cloud de Microsoft qui vise à concurrencer Google Drive et des services comme DropBox ou hubiC de OVH. L'out...

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• Microsoft dévoile la Preview de Windows Azure Mobile Services, qui fournit un Backend pour les applications mobiles et Windows 8

  Microsoft dévoile la Preview de Windows Azure Mobile Services qui fournit un Backend pour les applications mobiles et Windows 8 La plateforme d'hébergement Cloud Windows Azure vient de s'enrichir d'un nouveau service. Microsoft vient d'annoncer l'ouverture de la Preview de Windows Azure Mobile Services pour les développeurs d'applications mobiles et Windows 8. Windows Azure Mobile Services est une plateforme Backend as a services, qui fournit une solution clef en main dans le Cloud, permettant d'accélérer le développement d'applications connectées côté client. Le service rationalise le processus de développement en permettant d'exploiter le Cloud pour des scénario...

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• Sortie de Avgrund Modal : le plugin jQuery d'un nouvel effet pour popups et boîtes modales

  Sortie de Avgrund Modal le plugin jQuery pour vos boîtes modales et popups. Ce plugin, créé par Dmitri Voronianski, ajoute une impression de profondeur à la page lorsque vous affichez une boîte modale. Le contenu principal fait un zoom arrière (il rétrécit) et se grise. Il fonctionne dans tous les navigateurs récents. [IMG]http://dailyjs.com/images/posts/avgrund.png[/IMG] Simple d'utilisation, vous n'avez qu'à appeler ce code : Code javascript :

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