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• How can I set up VLANs in a way that won't put me at risk for VLAN hopping?

  - by hobodave

  We're planning to migrate our production network from a VLAN-less configuration to a tagged VLAN (802.1q) configuration. This diagram summarizes the planned configuration: One significant detail is that a large portion of these hosts will actually be VMs on a single bare-metal machine. In fact, the only physical machines will be DB01, DB02, the firewalls and the switches. All other machines will be virtualized on a single host. One concern that has been is that this approach is complicated (overcomplicated implied), and that the VLANs are only providing an illusion of security, because "VLAN hopping is easy". Is this a valid concern, given that multiple VLANs will be used for a single physical switch port due to virtualization? How would I setup my VLANs appropriately to prevent this risk? Also, I've heard that VMWare ESX has something called "virtual switches". Is this unique to the VMWare hypervisor? If not, is it available with KVM (my planned hypervisor of choice)?. How does that come into play?

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• How to install nvidia drivers (GT 440 ) on Xubuntu 12.10 , screen res gone to 640x480 :(

  - by shaggyjack

  Hi all after days of endless googling I finally gave in and decided to try and directly ask for help. I have just installed Xubuntu and updated to 12.10 on a pretty old (12 years) machine, and I am now struggling to install the correct drivers for the nvidia 440 gt card.. I have managed to get "additional drivers" but the app does not show in the menu, I went through a few procedures which ended up in my screen going no higher than 640x480, and tried all the sudo apt-get variations with nvidia-current and current updates... I think I got the right version of the drivers ( 93.43.07 ) but they won't install from terminal as they say I am running an X server. So I learnt how to shut the graphic interface but then I try and install them from there but after I write the exact same command (sudo home/username/Downloads/NVIDIA-Linux-x86-96.43.07.pkg1.run ) nothing happens and the terminal says something like command not found. I am desperate for help if anybody could point me in the right direction that would be greatly appreciated. There are lots of similar topics on installing nvidia drivers but I seem to understand that current drivers are no good for my old GPU. So if anybody could show me how to install the right version that would be excellent. Thanks in advance! Jack

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• Major permission repair needed on Mac Os

  - by Luke1111

  I made the fatal error of copying and pasting a sudo command into my terminal without double checking it, here it is. sudo -R mysql / What this does (for those that don't know) is recursively change the owner every file from the root down to mysql!! obviously not what i was intending This has of course played havoc with my system, the first thing i did was the apple permission repair but that only works for files that it has an idea of though it has changed a lot of file ownerships back to root. It seems that many library files are still owned incorrectly, as a lot of problems don't work. What i propose doing as a temporary fix until i can reinstall mountain lion is to recursively set all ownerships that are mysql to Luke. I'm not sure what they should precisely but this is still better than nothing. Is this possible using a shell script? I realise that this won't fix the problem properly and i will have to reformat but i need the machine in a workable state just for this week.

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• Accessing local files through an http:// address

  - by RexE

  I would like to access a folder of mp3 files on my local Windows machine through http:// addresses. For example, typing http://localhost:9999/songs/test.mp3 into my browser would play test.mp3, which sits in a specified folder on my C: drive. What is the very simplest way to do this? (Background: a program I'm using wants me to enter the URLs of these files, but assumes they are remote and accessed over http. It doesn't accept URLs of the form file://C/Users.... So, I'd like to give these local files addresses that makes them "look" remote.)

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• Troubleshooting VMware on Ubuntu

  Summary of different problems while using VMware products on Ubuntu. This article is going to be updated from time to time with new information about running VMware products more or less smoothly on Ubuntu. Following are links to existing articles: Running VMware Player on Linux (xubuntu Hardy Heron) Running VMware Server on Linux (version 1.0.6 on xubuntu) Using ext4 in VMware machine   VMware mouse grab/ungrab problem (Source: LinuxInsight) Upgrading GTK library in Ubuntu since Karmic Koala gives you a strange mouse behaviour. Even if you have "Grab when cursor enters window" option set, VMware won't grab your pointer when you move mouse into the VMware window. Also, if you use Ctrl-G to capture the pointer, VMware window will release it as soon as you move mouse around a little bit. Quite annoying behavior... Fortunately, there's a simple workaround that can fix things until VMware resolves incompatibilities with the new GTK library. VMware Workstation ships with many standard libraries including libgtk, so the only thing you need to do is to force it to use it's own versions. The simplest way to do that is to add the following line to the end of the /etc/vmware/bootstrap configuration file and restart the Workstation. export VMWARE_USE_SHIPPED_GTK="force" The interface will look slightly odd, because older version of GTK is being used, but at least it will work properly. Note: After upgrading a new Linux kernel, it is necessary to compile the VMware modules, this requires to temporarily comment the export line in /etc/vmware/bootstrap.

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• How to to specify network address for a dhcp client

  - by drecute

  I have setup and configured a DHCP server on a sparc running Solaris 10. Now I want to test the DHCP server by creating a DHCP client on another computer running Solaris 11. I would like to know, how do I specify a network address for a dhcp client such that its generated ip address is within a specific subnet. For example: The DHCP server host = 172.1.1.1 So I want the client machine to have an IP Address in the range of 172.1.1.1 255.255.255.0. Please help me.

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• Windows 2003 - logging off the Administrator account makes web applications inaccessible

  - by Saravana

  Consider a web application installed on a Windows Server 2003 SP2 machine with the admin account. The application is accessible in the server as well as in the network when at least one session of the admin account is logged in. If there are no active sessions of the admin account, the web application is not accessible via the network, nor accessible locally when logged in with another user account. What would cause the web application to be inaccessible there's no Administrator session? Please suggest anything that might help find the solution.

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• Ubuntu won't boot, only displays GRUB terminal

  - by Badea Sorin

  I have a problem with my Ubuntu 11.04 installation. I've installed Ubuntu 11.04 from Windows, it worked fine for days, but today it won't boot. When I start the machine, GRUB loads. There is the Windows 7 loader, I select Ubuntu from there and after that, I should see the Ubuntu GRUB menu, where I'd select the mode to boot Ubuntu. However, I can't see that anymore. I directly get to a GRUB terminal. Can anyone help me with this? How would I recover my data or reset the boot loader?

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• What determines the time to first ping response in an OS?

  - by Stuart Woodward

  When a server (say Windows, Linux) is rebooted, it will take some time to respond to ping. I'm assuming that the software firewall has to be up before pings will be returned as there might be a setting to disable ping responses. Everyone knows that Windows and Linux have have totally different architectures so lets treat them separately. The answer I'm looking for is "After XXX is running, pings will be returned." It would be helpful to know where in the boot order this is too. i.e. at the start or end. I ask because we get questions from a customer about why it takes so long to respond to ping after creating a Virtual Machine. I'm sure this is just an artefact of the OS boot behaviour.

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• Streaming video in Virtualbox jumpy

  - by Kevin

  I am trying to get Netflix to work on my Ubuntu netbook. I know it will not run in Linux so I am trying it in my Win XP virtual machine. It streams the video but the sound and video are out of sync and the video often freezes and jumps. I have tried Firefox, Chrome, and even IE. I am thinking my Atom N455 processor does not work well with virtualization. All other apps in the VM work fine. The only issue is streaming [YouTube is jumpy too].Does anyone know of Virtualbox settings I can try to possibly fix this issue or am I out of luck?

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• Disappearing Windows Explorer pinned items

  - by surfmadpig

  This has happened twice now in three months: After rebooting, ALL the pinned items from my Windows Explorer taskbar jumplist are gone. Also, recent items from Windows Explorer are much fewer, only one or two if I remember correctly. After the first time I re-pinned the items I wanted, but about a month later it happened again. I re-pinned All other pinned items in other jumplists (e.g. Word) are fine and have never disappeared. Googling for the problem showed that ccleaner can affect this, but I personally do NOT use any cleaners or related progs on this machine. I also think that both times it happened it was after a windows update, although I can't recall what kind of update it was. After each time, Little Registry Editor showed invalid references in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs , but I had NOT used it prior to the deletions. Any ideas on why this happens and how to prevent it?

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• Troubleshooting USB Hub on Snow Leopard MacOSX

  - by calmcajun

  I just bought a Belkin F5U701-BLK 7-port USB Hub and when I plug it into my iMac it does not seem to recognize it. Do I need to reboot my machine or install a driver? If I have to install a driver where do I get it from? I tried going to Belkin's website to search for drivers and and support info for the hub but I could not find anything. Edit: The USB hub is powering the other devices but my iMac does not recognize both hard drives.

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• Mac OS X: pushing all traffic through a VMWare VM

  - by bj99

  I want to set up an Astaro (Sophos) UTM in a Virtual Machine. The Setup should be at the end the following: Cable Modem (one IP adress) | [Ethernet] Sophos UTM (running as VM [VMWare Fusion 5] on the MacMini) | [WIFI] Airport Express v2 (for sharing Local Network to wireless and wired clients) 1)| [WIFI] 2)| [Ethernet over Thunderbolt Ethernet Adapter]* Clients MacMini (Local File Server) *To have the Mini also protected behind the UTM So the setup process for the UTM works fine, but then the problems start: I just have one external IP (from my cable modem provider)== So if I put the VM in briged mode my Internet connection drops, because the MacMini also has its IP adress. If I put the VM to NAT mode the Mini itself is not protected by the UTM So: is there a way to hide the en0 interface(Ethernet) and the en1 interface (Wifi) from the MacMini, so that they not even appear in System Preferences Network section but are available to the VM? That way the Mini must connect to the en2 interface (Thunderbolt adapter) to make any Internet/LAN connection and I just use the given single IP from the Cable Modem. Thaks for any suggestions... Sebastian

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• How to send a pipe with psexec?

  - by Pierre-Alain Vigeant

  I'm trying to execute a pipe on a remote server by using psexec. The command that I'm trying to execute is psexec \\servername DSQUERY USER -name *userpart* | DSGET USER -samid -display Currently, the | pipe symbol get executed locally which is not what is wanted (since dsget does not exist on my machine). I tried to use quote around the whole command psexec \\servername "DSQUERY USER -name *userpart* | DSGET USER -samid -display" but that resulted in psexec trying to run that whole quoted sentence as one executable, which obviously does not exist. How can I pass a pipe symbol to the remote server so that it can execute it?

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• How can I programmatically change the keyboard layout?

  - by Jason R. Coombs

  I want to run a shell command or script that will configure each of my Ubuntu Precise boxes to use the Dvorak keyboard layout as the default (and only) layout. With earlier versions, I was able to set the XKBVARIANT in /etc/default/keyboard but when I make this change in Precise (and reboot), the keyboard layout appears to be unaffected (both in console and in gnome). I tried also setting the XKBMODEL to pc105 and XKBLAYOUT to us, but that did not seem to help. I know I can set the layout for gnome using the 'keyboard layout' tool... but I want the change to affect the console, and I want to automate the process. How can I accomplish this? Edit: To clarify, I want to know how I can cause to change (using only a script or command-line) the keyboard layout to be Dvorak as the default and only keyboard layout for both Gnome and the console. I want this change to be persistent (survive reboots), just as it is when the change is made through the Keyboard Layout tool. Edit: Let me put it another way. If I had installed the operating system myself (which I did not because the OS was installed by the virtual machine infrastructure), I could have selected the desired keyboard layout at install time, and that layout would be applied persistently, system-wide. How can I change the layout to appear as if I had set it during the install process?

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• remote symbolic link / junction

  - by Blueberry

  Might be a pretty obvious one but have had some trouble finding solid answers. I have a directory on a windows network share containing different versions of an application. I would like to have a link to one of these called 'current', which will be a symbolic link to the directory sitting beside all the other versions and pointing to one of these. Creating this link seems to be more of an issue than I would have thought. Looks like symlink only shows the link on the same machine as where it was created (which is not going to work for obvious reasons) and junction needs to be run on the server which is practically impossible due to various restrictions. What would be the best way to go about this? Would I just need to copy the files twice or can I have a symbolic link which can be created and accessed remotely?

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• Slow Web Performance on two Windows 2008 R2 Terminal Servers

  - by Frank Owen

  We have two Windows 2008 R2 servers that we use for agents to log into to access our customers systems. Saturday morning we received complaints that on both servers the web is running horribly slow. This happens on all websites and the majority of the time the web site times out trying to load. Other users located at the same site but using their desktop machine do not see any issue. We have rebooted the boxes and checked settings and cannot find the cause. The CPU/Memory/Network/Disk Space use on the server is very low. I thought it might have been a MS update causing the issue but it appears the last update was applied in January. We have rebooted both boxes and I am in process of trying a different browser. Any ideas what could be causing this?

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• Word 2003: Bullet style renamed; is there some way to reverse this?

  - by Margaret

  I have a machine that seems to have had its bullet style permanently changed - I previously was creating a document which had a question/answer format, where the answers were bullet points, so I created a style for them. The problem is, it seems to have stuck. If you click the "Bullet" button, the paragraph is formatted in the style. I've tried deleting the style in Normal.dot, and even deleting the Normal.dot file in the entirely - neither seems to fix the problem. Anyone have any other bright ideas on how to fix it?

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• Umbraco on Windows 7 64-bit

  - by HeavyWave

  I'm trying to install Umbraco CMS on Windows 7 64-bit and I get the following exception: [HttpException (0x80004005): Could not load file or assembly 'ImageManipulation, Version=1.0.2105.41209, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Failed to grant minimum permission required. The application pool's trust mode is set to 'Full', all the user permissions are just as on other sites hosted on the same machine. I went through all relevant topics on Umbraco's forum, but all advices are about the trust level. How do I fix this?

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• Able to ping but does not get the data

  - by Dany

  I am facing a problem in my client server program; when using wireless I can ping but not receive any data. There is a source which receives a streaming request from client via server. This works fine when all the machines are connected through LAN cable but when I put all the computers in wi-fi network, all the machine are able to ping each other but when the client send the stream request to the server the ping request between server and client says destination unreachable. It works all well until the client does not send the streaming request. What might be the issue?

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• Windows Server vs Sharing

  - by Mark Lawrence

  Not sure if this is the right place for this question. I have a friend that owns a small business running 3 local machines, that are connected to the internet, and a server that each local machine connects to. He has recently bought a newer server, and by server I mean a Windows Vista box. He wants to use this purely to store data that the 3 local machines can access, kind of like a glorified external hard drive. Im suggesting to fore-go the server option and simply setup sharing on the 'server' box. Interested in hearing any suggestions as to whether the server idea is preferable?

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• Can't find generic USB audio driver for a Samson COU1 USB microphone

  - by user10321

  I am unable to use a Samson USB CO1U microphone on a PC running XP, SP3. When I plug it into the USB port, Windows generates the sound indicating that it has found new hardware, and the green LED on the mic lights. But, it does not work, and the device manager reports that it cannot find a driver after searching. The same mic works on a Vista machine. Samson has no driver on their Web site, and insists that the generic audio driver in Windows should work. (http://www.samsontech.com/PRODUCTS/productpage.cfm?prodID=1810). I cannot find a generic USB audio driver at Microsoft.com. Can anyone help? Larry

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• Nagios: Which services should I monitor on different roles of servers?

  - by Itai Ganot

  I've started working in a new workplace and my first task is to build a Nagios server and configure it to monitor the servers in the network. Since I'm starting from scratch I wanted to hear from you, experienced users, which checks should I configure for each role? For example, there are some basic checks which I run on each Linux machine I monitor: SSH, Ping, Load, Current Users, Swap Usage, etc... Now my question is, which specific checks should I run for a DataBase server, for a Networking Switch, for Httpd servers? (I currently monitor how many httpd processes are running) Thanks in advance

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• Understanding why a 450W power supply is destroying my ATX motherboards but not mATX

  - by T. Webster

  Maybe I'm missing something really obvious here, but after going through 3 new motherboards in trying to build my new machine, I'm finally certain that the 450W power supply I bought has been destroying them. It seems like it should be simple: just connect the connectors where they fit and switch the thing on. But today after hooking it to my ASUS Sabertooth 990FX TUF Series Motherboard and switching it on, I could see and smell the smoke coming out of the motherboard. What I don't get is why I can hook this same 450W power supply up to my mATX motherboard and not run into the same problem. What am I missing here? Where on the box or manual is this? (I have 8x2 GB RAM, AMD FX-4100 3.6GHz CPU, 1 512MB ATI graphics card, 1 WD 7200 RPM SATA hard drive. )

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• Keepalived with apache unable to bind interface on Backup server

  - by davideagle

  I have two debian 6 servers running keepalived 1.1.20 with one server acting as a Master and the other as a Backup. Both servers host apache 2.4 that have a global Listener on all interfaces on port 80 (Listen *:80) how ever I have some sites that require a listener for port 443 (SSL) and that is configured for each VirtualHost in the Apache config since I do not want every VirtualHost to listen on port 443. The problem is when I try to start Apache on the Backup machine that does not hold the virtual interface the VirtualHost is supposed to be listening on, I get AH00072: make_sock: could not bind to address 1.1.1.1:443. I know this is expected behavior of Apache. The real question is are there any known workarounds or solutions to this scenario?

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