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• Atheros AR928X wireless connection makes neighbourhood machine drop off line

  - by funicorn

  I have an Acer laptop with Atheros AR928X wireless card installed, supported by ath9k driver in the linux kernel. There are other 5 computers sharing wireless connection via a TPLink 150Mbit/s wireless router. At first I found the network is a little bit slower than it's in Windows7, which I accepted as it should be. However a very strange thing is, each time I connected to the router and downloaded stuff for a while, one of the computers running Windows7 in my local network dropped off from the router. And if I run my laptop under Windows7, everything is fine. What's even stranger is although the network becomes slower, only the certain computer drops and totally freezes in connection with the router. I'm not willing to conclude it's due to the unhealthy connection from my laptop to the router, however we have confirmed this for more than one times and there is no problem with the network when I'm running WIndows7. I'm extremely confused about what's going on. As a Linux user running Ubuntu over 5 years, I am awared that wireless driver in Linux is badly notorious of lack of stability and slow speed. But is it so bad that the unhealthy wireless connection can do damage to another computer in the same local network? I do see a lot of "Tx excessive retries" in iwconfig output. But how exactly does this happen ? Thanks for your help. I guess I have to use this answer box to show the outputs $ sudo iwconfig wlan0 IEEE 802.11bgn ESSID:"TP-LINK111" Mode:Managed Frequency:2.427 GHz Access Point: E0:05:C5:E8:A9:92 Bit Rate=121.5 Mb/s Tx-Power=16 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=47/70 Signal level=-63 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:2 Invalid misc:23 Missed beacon:0 To show what's wrong with the wireless connection, I ran iwconfig again within 3 minutes, during which time I hardly did anything and the network was not much busy than being nearly idle $ sudo iwconfig wlan0 IEEE 802.11bgn ESSID:"TP-LINK111" Mode:Managed Frequency:2.427 GHz Access Point: E0:05:C5:E8:A9:92 Bit Rate=121.5 Mb/s Tx-Power=16 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=48/70 Signal level=-62 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:9 Invalid misc:28 Missed beacon:0 You can see Tx excessive retires and Invalid misc increase very quickly. $ sudo iwlist wlan0 modu wlan0 unknown modulation information. $ sudo iwlist wlan0 channel wlan0 13 channels in total; available frequencies : Channel 01 : 2.412 GHz Channel 02 : 2.417 GHz Channel 03 : 2.422 GHz Channel 04 : 2.427 GHz Channel 05 : 2.432 GHz Channel 06 : 2.437 GHz Channel 07 : 2.442 GHz Channel 08 : 2.447 GHz Channel 09 : 2.452 GHz Channel 10 : 2.457 GHz Channel 11 : 2.462 GHz Channel 12 : 2.467 GHz Channel 13 : 2.472 GHz Current Frequency:2.427 GHz (Channel 4)

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• Unable to install Ubuntu 12.10 on windows 8 machine/ error no5

  - by JOBIN VARGHESE

  installing crashes at halfway of 'copying files' showing an i\o device error error no5; there was problem in beginning of installation too, ubuntu was not detecting the installed windows 8. my system is a dell inspiron 5520 laptop ,with 1 tb WDC hard disk in GPT ,with EFI . my current partition is like 102 mb EFI SYSTEM partition 200 gb Windows 8 ntfs 22 gb root Ext4 8 gb swap 20 db home Ext4 680 gb ntfs Drive for storing all my files. i tried both dvd disc and usb drive, both resulted in same error. inbuild dell hardware diagnosis utility showed both hard disk and dvd drive as healthy what may be the reason and how can i install ubuntu along side my windows 8?

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• Need to configure 4 Serial ports virtualbox guest win machine (my host is ubuntu 11.10)

  - by ubu

  I have an application that run's on winNT and requires the APCI-7500 card (a 4-multiport serial card), so I've installed the winNT thru virtualbox, but as i try to configure the serial ports I notice that virtualbox shows only 2 serial ports, only 2 tabs in the ports configuration section.How can I add the other 2 ports and configure them. My host is ubuntu 11.04 My guest is winNT My virtualbox version is 4.0.4_OSEr70112 I'll appreciate any help. Thanks in advance. I've followed these threads but still get no light in this issue How to access serial ubuntu host serial port on VirtualBox guest OS Can't access host serial port on VirtualBox Winxp

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• Foraward Traffic from local machine to proxy server using iptables

  - by Vaibhav

  I am using Ubuntu Server 12.04. My IP is 192.168.4.160. I want to route the HTTP traffic generated locally from my system destined to a particular URL (say x.x.x.x) to pass through proxy server. My proxy server is 192.168.0.13:3128. I added following rule in iptables sudo iptables -t nat -A OUTPUT -p tcp -d x.x.x.x --dport 80 -j DNAT --to 192.168.0.13:3128 However, this rule does not seem to work for me. I captured packet in wireshark and I saw that packet is still going to x.x.x.x I am not very much familiar with iptables, so please try to be specific. Thanks in advance

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• Working on a virtual machine as a developer

  - by Johnny000

  In the company I'm currently working in, they decided that each developer will move to a VM desktop (Citrix/WinServer2012) an develop/test from there with restricted/no rights to install new software. The Server we will be working on are in a remote Datacenter. So i.e. if for some reason or another the internet brake down, we can't work till the connection is up again. As a developer I don't want to use windows as OS for my working/development environment as there is no need because we don't develop OS specific software. What good points could I raise in an argumentation against moving to the VMs beside the loss/restriction of freedom and the loss of connection to the internet?

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• Fastest way to run a JSON server on my local machine

  - by Mohsen

  I am a front-end developer. For many experiemnets I do I need to have a server that talks JSON with my client side app. Normally that server is a simple server that response to my POSTs and GETs. For example I need to setup a server that saves, modifies and read data from a "library" database like this: POST /books create a book GET /book/:id gets a book and so on... What is the fastest and easiest technology stack for database and server in this case? I am open to use Ruby, Nodejs and anything that do the job fast and easy. Is there any framework (on any language) that do stuff like this for me?

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• Can't uninstall trial version of Expression Blend 3, error writing to file Config.msi

  - by rem

  I can not remove a trial version of MS Expression Blend 3 from my pc. I am always getting the same error: "Error writing to C:\Config.msi\6e6288.rbf." The name of the file varies. On the error message window there are two buttons: "Retry" and "Cancel", but clicking on any of them gives the same result - uninstall is cancelled and everything is rolling back. I tried to change access permissions to that folder in many ways, but result all the same.

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• Ghost in the machine

  - by GrumpyOldDBA

  Well it does relate to ghosts, in this case dbGhost, http://dbghost.com/    which is what this post is about. Ghost creates databases on the fly, something I personally don’t like too much, which it then compares to a “base” database to produce release scripts. ( The brief description ). As with all things sometimes all is not well and the server is left with a number of ghost created databases so I have to have a job to delete these every night before backups, it’s not difficult to code...(read more)

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• Grub messed up on dual boot machine - can't boot live usb

  - by Sam

  I have a laptop on which I had Win 7 and Ubuntu 12.04 installed. The hdd has two partitions (one primary and one extended). Grub wasn't loaing initially so I ran the boot disk repair tool which seemed to sort it out. However, I mistakenly removed python (long story) from the Ubuntu OS and this obviously messed up Ubuntu a lot. So I decided to reintsall both Win7 and Ubuntu 12.04 in an attempt to get things back fresh. Win 7 went fine, but now when I try and use the Live USB to install Ubuntu I get: error: no such device: grub rescue I guess grub is still there despite the Win 7 reinstall and it can't find the partition for Ubuntu (which I deleted prior to the fresh install). I have tried fixmbr in windows console and the boot-repair-disk utility, but no joy. I cannot boot the live usb so no access to linux. A real mess. Any suggestions from the community?

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• Static IP Address on Ubuntu 12.04 Virtual Machine

  - by chrisnankervis

  I've setup a VM running Ubuntu 12.04 specifically for local web development and am having some problems ensuring it has a static IP address. A static IP address is important as I'm using the IP address in my hosts file to assign a .local suffix to addresses used both in browser and to connect to the correct database on the VM. Currently, every time I connect to a new network or my VM is assigned a new IP address I need to reconfigure my whole environment which is becoming quite a pain. It also probably doesn't help that the default-lease-time on the Ubuntu VM is set to 1800 by default. At the moment I'm using VMWare Fusion and the Network Adapter is enabled and set to "Autodetect" under Bridged Networking. I've tried to set a static IP address within the dhcpd.conf using the code below: host ubuntu { hardware ethernet 00:50:56:35:0f:f1; fixed-address: 192.168.100.100; } The fixed-address that I've used is also outside the range specified in the subnet block (which in this case is 192.168.100.128 to 192.168.100.254). I've tried adding and removing the network adapter and restarting my Mac after each time to no avail. Below is an ifconfig of the VM that might be of some help: eth0 Link encap:Ethernet HWaddr 00:50:56:35:0f:f1 inet addr:192.168.0.25 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe35:ff1/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1624 errors:0 dropped:0 overruns:0 frame:0 TX packets:416 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:147348 (147.3 KB) TX bytes:41756 (41.7 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Are there any specific issues with 12.04 that I'm missing? Otherwise has anyone else got any ideas? Thanks in advance.

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• Fixing a typo in machine name

  - by justSteve

  When i installed windows i had a typo in the machine name that i corrected from the system's 'Computer Name/Domain Changes' - the workstation is a member of a workgroup not a domain. From everything i can see the renamed machine name is correct. Shift gears.... I'm importing SQL logins from my remote server to this, my development workstation and have used the script presented here - a script that generates a CREATE statement for each login found. While I was preparing to run this script's output (from the remote box) i needed to change the domain name from the remote to my local's name - so i ran the same script locally (in order to see what SQL things my domain name is. SQL has the original machine name - the one with the typo. However, the scripts are tossing errors if i try to create logins with that identifier. CREATE LOGIN [Setve\Admin] FROM WINDOWS WITH DEFAULT_DATABASE = [master] But works correctly if i use the updated machine name: CREATE LOGIN [Steve\Admin] FROM WINDOWS WITH DEFAULT_DATABASE = [master] So the problem is: do i have a problem i need to solve? Somewhere, deep in the guts of SQL Server, it has record of a Domain name that does not exist. Should i find and fix that discrepancy? thx

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• how to fetch the website code in my local machine

  - by vipin8169

  i have a local GIT repository in my system by name 'git_repo' under which i had the whole codebase for a website(pre-configured by someone else), including all the jsps, js, css etc. I used the following commands to create the local git repository out of the main repository: git branch //to show the current branch git checkout -b branch_local_name origin/Main_branch_name //to create local repository in current branch git fetch //to fetch the current build Accidently, i deleted all the contents of the local folder and i don't know what to do fetch the contents of that website again. Please help !!!

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• MongoDB: ReplicaSet slower than a corresponding Master/Slave config

  - by SecondThought

  Is it true that a mongoDB configured as a replicaset (lets say two nodes + an arbiter) will always be slower than the same DB and server specs but configured as a Master? I've run some tests and found out that for a fresh DB, RS is a little quicker than Master/Slave config but when the DB is getting bigger than ~100k records the latter is getting much snappier. am I missing something here? PS: I was testing it with mongoid driver for ruby.

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• VPN sharing on Mac OS X 10.5 machine

  - by Jens

  I have a rather weird problem. I want to share a VPN connection that has been established by my Mac OS X 10.5 computer with another machine in my network. This is what I did: In the /etc/hostcongig file on the main computer I added the line: IPFORWARDING=-YES- I assigned a fixed IP address to my computer (192.168.178.30), a fixed one to the other machine (192.168.178.60) and my computer's IP address as gateway on the other machine. I connected to my VPN using the internal Mac OS X VPN client (PPTP connection) I run this script: #!/bin/sh natd -same_ports -use_sockets -unregistered_only -dynamic -interface ppp0 -clamp_mss ipfw -f flush ipfw add divert natd ip from any to any via ppp0 ipfw add pass all from any to any sysctl -w net.inet.ip.forwarding=1 Source: Using (and sharing) a VPN connection on your Mac Now everthing works smootly, however speed is an issue. I get 1,8 MBit/s on my main machine and only 0,3 - 0,6 MBit/s on the other one. My question: What could possibly be wrong? Do I have to tweak MTU settings, is there any packet inspection ongoing that needs time....? Any help appreciated!

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• How to Send and Receive Faxes Online Without a Fax Machine or Phone Line

  - by Chris Hoffman

  Some slow-moving businesses and government agencies may not accept documents over email, forcing you to fax them in. If you are forced to send a fax, you can do it from your computer for free. We’ve previously covered ways to electronically sign documents without printing and scanning them. With this process, you can digitally sign a document and fax it to a business — all on your computer and without any printing required.    

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• Modeling player mechanics with a finite state machine

  - by K..

  I have three states standing walking jumping When I press D standing transitions to walking. The velocity will be set to a defined value and the player moves. When I release D walking transitions back to standing, which sets the velocity back to 0. When I press W and the state is walking it transitions to jumping, but when the player hits the ground, it goes back to standing. jumping has a transition land that always leads to standing because a state doesn't know about its previous states. Since standing sets a velocity of 0 the player stops walking, when he hits the ground. How do I prevent this?

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• Fastest way to set up a JSON server on my local machine [closed]

  - by Mohsen

  I am a front-end developer. For many experiements I do I need to have a server that talks JSON with my client side app. Normally that server is a simple server that response to my POSTs and GETs. For example I need to setup a server that saves, modifies and read data from a "library" database like this: POST /books create a book GET /book/:id gets a book and so on... What is the fastest to set up and easiest technology stack for database and server in this case? I am open to use Ruby, Nodejs and anything that do the job fast and easy. Is there any framework (on any language) that do stuff like this for me?

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• [nginx] Merging variable with string in config file

  - by Swistak

  Hello, I have following setup in my conf file upload_set_form_field $upload_field_name.name "$upload_file_name"; but I want change chosen param name to: upload_set_form_field ($upload_field_name+"[name]") "$upload_file_name"; so I can get "attachment[name]" but this dont work. I would be very happy if some one help me with merging variable with string in nginx config file :). Best regards, Ernest.

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• algorithm for Virtual Machine(VM) Consolidation in Cloud

  - by devansh dalal

  PROBLEM: We have N physical machines(PMs) each with ram Ri, cpu Ci and a set of currently scheduled VMs each with ram requirement ri and ci respectively Moving(Migrating) any VM from one PM to other has a cost associated which depends on its ram ri. A PM with no VMs is shut down to save power. Our target is to minimize the weighted sum of (N,migration cost) by migrating some VMs i.e. minimize the number of working PMs as well as not to degrade the service level due to excessive migrations. My Approach: Brute Force approach is choosing the minimum loaded PM and try to fit its VMs to other PMs by First Fit Decreasing algorithm or we can select the victim PMs and target PMs based on their loading level and shut down victims if possible by moving their VMs to targets. I tried this Greedy approach on the Data of Baadal(IIT-D cloud) but It isn't giving promising results. I have also tried to study the Ant colony optimization for dynamic VM consolidating but was unable to understand very much. I used the links. http://dumas.ccsd.cnrs.fr/docs/00/72/52/15/PDF/Esnault.pdf http://hal.archives-ouvertes.fr/docs/00/72/38/56/PDF/RR-8032.pdf Would anyone please explain the solution or suggest any new approach for better performance soon. Thanks in advance.

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• Blockbuster Time Machine

  - by David Dorf

  In another example of clinging to the core business much too long, DISH announced its closing the remaining 300 Blockbuster stores.  This reminds us that we must always be looking over our shoulders for the next big thing.  Blockbuster had the opportunity to buy Netflix, but it passed just as Barnes & Noble decided it didn't need to partner with Amazon.  Its so tempting to stick with a profitable business instead of taking a risk on a new idea.  Nevertheless, Blockbuster is history -- and this video from The Onion seals it. Historic ‘Blockbuster’ Store Offers Glimpse Of How Movies Were Rented In The Past

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• SSD options in /etc/fstab stop machine from booting

  - by nbubis

  I just recently installed 12.10 on a new Lenovo T430, and added these options in \etc\fstab: discard, relatime To \sda1 on which \ is installed. When I rebooted, I got an error claiming that it couldn’t read \, and got thrown into a read-only shell, which necessitated booting from a rescue disk to revert to the original fstab. So: What are the correct options for SSD, and how can I make sure I won't get locked out of the system again?

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• Need to isnatll windows 7 on dual boot machine

  - by user108451

  I have dual boot configured with Windows 7 (32bit) and Ubuntu 12.04(64bit). I installed Ubuntu after windows, now my windows is corrupt due to some virus and I need to reinstall it. Currently when I start my PC, grub loader comes up and I need to select Ubuntu or Windows. I was wondering how can I install windows again and still have my Ubuntu install? Is there a way to do this? I do not want to install Ubuntu again and lose my settings and data there. Thanks, Ketan

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• Restoring Virtualbox machine images from old hard drive

  - by memilanuk

  I recently replaced the HDD in my laptop, and re-installed Windows & Ubuntu. Now I want to restore the various virtual machines I had set up on the old HDD, which is mounted in an external USB enclosure. I can read the HDD okay, and the 'bad' spots seemed to be in the Windows partition... but whenever I try to restore the VDI files the copy errors out. I've tried drag-n-drop in Nautilus, I've tried grsync, etc. Always bombs out on the VDI files. I've copied over multi-GB dvd iso images with no problem, but the VDI files always fail the checksums. Any ideas? TIA, Monte

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• Setting Up Tunneling With a VirtualBox Guest Machine

  Tip of the Trade: VirtualBox makes it easy to set up and run virtual machines on your own desktop. It is not perfect, however, and by default, the guest VM is invisible to the host or any other machines on the network. Here's an easy way to relay instructions to it.

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• Ruby installed on Ubuntu 10.10 slow on one machine but not other

  - by Aaron Jensen

  I have a machine that was provisioned several months ago. RVM was used to install ruby 1.9.3-p125 as well as 1.9.3-p125-perf. When I compared raw ruby performance to another identical machine the older machine smoked them. For example: ================================================================================ With in-block needle calculation ================================================================================ Rehearsal ---------------------------------------------- detect 3.790000 0.000000 3.790000 ( 3.800895) each 2.410000 0.000000 2.410000 ( 2.420860) any 3.960000 0.000000 3.960000 ( 3.972099) include 1.440000 0.000000 1.440000 ( 1.442862) ------------------------------------ total: 11.600000sec vs ================================================================================ With in-block needle calculation ================================================================================ Rehearsal ---------------------------------------------- detect 10.740000 0.000000 10.740000 ( 10.769366) each 6.080000 0.010000 6.090000 ( 6.106323) any 10.600000 0.000000 10.600000 ( 10.641606) include 4.160000 0.000000 4.160000 ( 4.171530) ------------------------------------ total: 31.590000sec I attempted to reinstall 1.9.3-p125 with rvm on the fast machine and that ruby is now slow. It's as if something changed in RVM, or I installed some package that made compiled versions of ruby perform significantly worse. I know this is a tough question to answer, but what things should I look into in order to track down why the performance has suffered so much? edit I just attempted to install with ruby-build and the version installed was fast. Something rvm is doing to build it in my environment is slow.

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