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  • Get/Assign IP addresses assigned by the DHCP sever with DLink switches in between

    - by Ranjith Kumar
    In our office the setup is like we have a UBUNTU server with DHCP Server connected to all the PCS via 24 port and 8 port DLink switches. How can I find all the PCS(with client name, ip and mac address)in the network?? When I do "vi /var/lib/dhcp3/dhcpd.leases", I get all the ip addresses for the switches. I have used "arp-scan --interface=eth0 --localnet" to get all the IPs and MAC Addresses in my local network. I couldn't find any option to diplay client name. Also I would like to assign particular IP for a particular PC. I have done the changes in the dhcp.conf file but it is not working as they are not directly connected to DHCP-server(DLink switches in between). How can I assign IPs for PCs in this kind of setup. Thanks in advance

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  • Can one build a single disk RAID 1 array?

    - by Core Xii
    I have an Nvidia hardware RAID 1 array and need to reformat. But I don't have any spare storage media, so I need to get along with the 2 disks in the array. I figured I'd do as follows: Delete the array, so I have 2 separate but identical disks, A and B, with my files Put disk B aside Reformat disk A, build RAID 1 array with it, install Windows XP Put disk B back in Boot to Windows on disk A, copy my files from disk B to disk A Add disk B to the RAID 1 array, rebuild array And now I'd have a new RAID 1 array, fresh install and all my files intact (the ones I copied). Here are the parts I'm unsure about: Can I build a RAID 1 array using just one disk, then add the other one later? Can Windows on disk A see disk B and allow me to copy my files over?

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  • HPC Cluster planning workflow?

    - by Veronica
    After three days of intensive Google searching, I have not found any high-level workflow of how to build a low profile - cheap - computing cluster (we are not interested in HA yet). This is just a front-end plus a node for now. We want to start small with rockscluster, provide a web-based server for offering services, and then add nodes as our budget increases. We're small company, so we haven't enough human resources to implement it smoothly. Here are some facts about our environment: Our hardware is not constant (we will add nodes). Our workload will vary (in the order from 200Mb - 1Tb) Our software will change (scientific applications for data mining) Do you know any visual workflow, worksheet, chart, describing the general necessary steps to begin our cluster planning?

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  • How to make VirtualBox headless answer on rdp port?

    - by stiv
    I'd like to run windows xp on RDP: $ VBoxManage modifyvm winxp32 --vrdeport 3389 $ VBoxHeadless -s winxp32 -v on Oracle VM VirtualBox Headless Interface 4.1.18_Debian (C) 2008-2012 Oracle Corporation All rights reserved. (waiting) in another window: $ telnet localhost 3389 Trying 127.0.0.1... telnet: Unable to connect to remote host: Connection refused Yes, I've read about extension: $ sudo VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-4.1.20-80170.vbox-extpack 0%... Progress state: NS_ERROR_FAILURE VBoxManage: error: Failed to install "Oracle_VM_VirtualBox_Extension_Pack-4.1.20- 80170.vbox-extpack": Extension pack 'Oracle VM VirtualBox Extension Pack' is already installed. In case of a reinstallation, please uninstall it first Looked through all manuals and all help requests. No success. What's wrong? Any ideas?

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  • Redhat 6 gui installation VS kickstart gives me different packages?

    - by jonaz
    If i do the graphical install and select basic server + aide and screen i get a system with 535 installed packages. If i look at the /root/anaconda-ks.cfg file in that freshly installed system i see: %packages @base @console-internet @core @debugging @directory-client @hardware-monitoring @java-platform @large-systems @network-file-system-client @performance @perl-runtime @security-tools @server-platform @server-policy @system-admin-tools pax python-dmidecode oddjob sgpio certmonger pam_krb5 krb5-workstation nscd pam_ldap nss-pam-ldapd perl-DBD-SQLite aide screen If i then install a NEW system using a kickstart only containing those packages i get 620 installed packages. So basicly my question is why does the system install almost 100 more packages when using kickstart compared to the GUI installation when the exact same packagegroups are selected?

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  • Port based bandwidth shaping

    - by nixnotwin
    I have an interent connection with the speed of 4000k bits up and down. I want to do port based traffic shaping on a ubuntu machine, which acts as router. eth0 is the WAN interface. This is how I would like to allocate bandwidth: For ports 80 and 445 the bandwidth usage can go upto 90% For ports above 1024 upto 65535 the bandwidth usage can go upto 10% For remaining ports the bandwidth usage can go upto 40% The easiest way for achieving the above is using a router with tomato firmware. I have used it and it is very efficient. I want to try if it can be done on a Ubuntu or any GNU/Linux machine. I have googled extensively about the topic and I feel there isn't much information.

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  • What are the mandatory Linux kernel modules to run inside of ESXi

    - by Marcin
    I'm used to rolling my own kernels for servers, as it nicely minimizes the number of exploits (and the resulting patches) to take care of. In a traditional (bare metal) world, the whole process is about knowing what you have (hardware), and what you need (Ethernet, IPv4, iptables, etc.) In a virtualized environment, some things stay the same (still need Ethernet and IPv4), some things go away (power management), and then there are some new needs (vxnet3, or vmware-tools, even though that's compiled outside of the kernel). So my question mostly concerns itself with the last two categories: what can I remove completely, and what new stuff do I want? For example, what IO scheduler do I want, if all my disk operations are going through another filesystem/scheduler/cache to get to the virtual disk? Do I need hyper-threading enabled, or is the VM going to show them to me anyway as a CPU anyway? Do I need Large Receive Offload turned on, or is that something that the hypervisor's network drivers are going to do for me?

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  • What is IPKVM and why would I need that to install SQL Server on my Web Server?

    - by Eric
    Hello. I have a dedicated server, and will be installing SQL Server. However, my hosting company said they can connect an external CD ROM drive and give me KVM over IP to install SQL Server. My question is, what is IPKVM, and how does it work? Do I need special hardware or software on my side to use it....or do I just connect via remote desktop? Also, why can't I remote into my server through remote desktop instead of using KVM over IP?

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  • Cannot assign port 4 to WAN on TP-Link WR740N by DD-WRT wiki

    - by Victor Sergienko
    I'm following the DD-WRT instruction to get TP-Link WR740N v3's Port 4 on a different VLAN, but this doesn't happen. First, I have no "Setup VLANs" settinngs tab in DD-WRT v24-sp2 (07/20/12) std r19519. I can get Internet on Wi-Fi if assigning eth1 to "WAN Port", but then all Ethernet ports get on the same VLAN and any wired connection grabs the DHCP address and Internet connection from router. When following the "old" instruction, if I run, say, nvram set vlan2ports="2 5*", should there appear a new interface, vlan2, in ifconfig, after ifconfig vlan2 up? It doesn't - does it mean there is no support for different VLANs in my software/hardware? What am I missing? Is it impossible to create more VLANs on TP-Link740?

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  • Is it possible to have a portable plotter that can print QR codes on burlap?

    - by Brian Ballsun-Stanton
    This is a hardware question. Is there a class of plotters that are portable and accept sharpies? The use case: I have a burlap sack. It will be taking very specific potsherds from an archaeological dig. It needs an indelible QR code (or bar code) printed on the burlap. (Stickers have far far too short a lifetime). It was my thought that a plotter that uses sharpies and that works in the field would be the optimal solution for this problem. Is a portable plotter the right solution? If so, who makes them? If not, what is a better solution?

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  • Configuring ejabberd on ubuntu ami of amazon ec2

    - by andy
    This is my first experience with ejabberd. Spare me if I miss anything. I have installed ejabberd server on ubuntu 12.04 AMI on Amazon EC2. I have successfully installed the server, added the admin user and host in the config file and opened up reqd ports (5222, 5223, 5269, 5280). Now I tried to login the web admin interface using the admin user id and password. I could log in, BUT I could only see one section, Virtual Hosts. No Control Lists, Access rules, Nodes and Statistics Menu items on the left. Also, when I click Virtual Hosts Menu item, the page that comes up does not show anything. Here are the screenshots

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  • How to connect SharePoint Online with Dynamics CRM Online using BDC?

    - by ripperus
    I try to connect SharePoint Online with Dynamics CRM Online using BDC. But without any results. I'll try to using Account's from CRM in SharePoint Online like a list. I mean - when I have 100 account's (customers) in CRM I want to export this account's to SharePoint Online like a list. And when I will bed edited account in CRM the elements in the list will be update (and when I edited element on SharePoint list it will update in CRM). Is there any possibility to connect in this way? If if what I should use - SharePoint Designer 2010, Visual Studio or do this on web interface?

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  • telnet to 3389 connects, RDP remote desktop app bails ?

    - by scott_lotus
    I can TELENT 192.168.10.10 3389 and get a connection. But RDP client to 192.168.10.10 immedietly bails (i.e less then 1 sec) "connect" button greys briefly, RDP app remains on screen. Have tried these from many nodes on the subnet to 192.168.10.10 with same result. On 192.168.10.10 Allow Remote Desktop is enabled. On 192.168.10.10 windows firemall is off. Im connecting from the same subnet i.e no firewall hardware / routers in the way. AV software is installed but other nodes on same subnet allow RDP connection using exact same AV settings (network group profile) Checked 192.168.10.10 for any additonal AV software or local firewall products. Im sure non exist. Checked regedit to ensure 3389 was the port set for listening. Seems to be an XP problem (sp3) ( 2 nodes on the my LAN have this issue) and many work fine. Thanks for any help Scott

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  • Does a portable secondary laptop LCD monitor exist?

    - by Dougnukem
    I'm looking to buy a portable secondary LCD monitor for my Macbook Pro, does anything like that exist? I found some laptops that provide a dual 15'' monitor solution (but it's already baked into the hardware). Also some ideas posted about creating this type of setup back in 2007. I'm looking for something that is as thin as a laptop LCD (with maybe a bulky power supply that I could easily daisy chain or plug into a power strip along with my laptop). How difficult would it be to buy a 17'' laptop screen and hook up a DVI connector and power supply, and build a simple monitor stand for it? I've gotten to used to a dual-monitor setup at work and at home with my laptop that having to use my laptop in single-screen mode makes me feel crippled.

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  • "MAS SMS-CDMA" Bluetooth service

    - by TuxRug
    I have my phone (LG Rumor Touch on Sprint) connected to my Windows 7 computer by Bluetooth. Usually, one of the services is unidentified and no driver is installed. Occasionally I have an issue that is solved by removing and re-pairing my phone with my computer. The last few times I have paired my computer and phone, the unidentified service was found and installed, as "MAS SMS-CDMA". It sounds like an interface that allows sending and reading SMS messages via Bluetooth. However, there is no software available from Sprint or LG that I have found that offers such functionality. Searching Google for "MAS SMS-CMDA" (with quotes) did not provide anything useful, only what appear to be CMDA information written in Spanish. What can I use this service for, and how do I use it?

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  • Are there significant performance difference between chipsets?

    - by Let_Me_Be
    I wanted to build a single PC to fit all my needs, but since hardware virtualization support (Vt-d specifically) is a huge problem, I decided to build multiple single-use oriented computers. In this scenario I want these computers to be as minimal as possible. So the core of my question is: "Are there significant performance difference between chipsets?" I'm considering Sandy-Bridge i7 or i5 for my "game console" computer. And since I will use only one graphic card, one or two HDD, 4-8GB RAM and nothing else, I would be fine with a micro-ATX board with a Q67 (or some other low-end chipset).

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  • Accessing multiple local HD's or RAID with ESXi 4.0

    - by Shawn Anderson
    How to I get additional HD's to be recognized and used by ESXi 4.0. When I purchased my system I had two 2TB HD's, but when I installed ESXi it only recognized one of them. I'm happy to get whatever number of drives that I need (I have a four bay SATA in my Dell T310). What are some options? RAID? If so, is it supported. I guess I would need hardware instead of software since ESXi is so small. The VMWare forums (where I've lived for the last two days) are a charlie foxtrot of outdated and conflicting info. I want to utilize my T310, with 32 GB RAM, 2.8GHz quad core to run many lab Windows VM's. I don't need production level availability but I do want decent performance, even though it's in a lab environment. A huge thanks to Jim B., Zypher, Helvick, and Jeff Hengesbach who posted answers to my earlier predecessor question on why ESXi was so sluggish.

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  • compTIA-AT EXAM

    - by SysPrep2010
    Hello everyone, I have been in the IT field only for two years. I have been dealing with servers, firewalls, routers, switches, backup servers, and desktop. For the desktop, i have been dealing with WDS (Window deployment services). Not a lot of hardware. My question is this, is it really important to have an AT cert under your belt. I dont see the point anymore. When a desktop goes down, what have been seeing, they just buy a new one. I mean I can rebuild systems they are fun, but I haven't in a while?

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  • Scaling up an apache server

    - by pehrs
    I have an Ubuntu server running apache2 which i expect to be hit by around 500-1000 (concurent) users for a limited amount of time. The server serves a mixture of custom (rather light) php pages connected to a postgresql db (around 20 Mb in size) and static content. The hardware is stable and pretty beefy: Intel Xeon E5420 @ 2.5 GHz 12 GB RAM During previous rushes on this server I have increased ServerLimit, the MaxClients for the MPM modules and decreased Timeout and KeepAliveTimeout. It has worked, but been sluggish and I have a feeling more can be done. How would you suggest configuring the Apache server to handle this kind of load?

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  • OS Missing? Messed up the MBR on Win7 64-bit

    - by hom3lesshom3boy
    I have a Windows 7 machine with two hard drives: a 1TB C: drive and 500GB J:. I had Windows XP installed on C: and Windows 7 installed on J:. I installed Windows 7 after Windows XP from an installer .exe I (legally) bought and downloaded. It, and all of my other files, are sitting on my J: drive intact. While under my Windows 7 install, a few days ago I decided to use Priform's CCleaner and use its DriveWipe utility to wipe the C: drive. 1% into the process, I cancelled and attempted to use it again. It gives me an error saying it can't format the drive, so I poke around the Internet a bit, give up, and restart my computer. I first get an "OS is missing" error after the computer boots past the BIOS. I downloaded and put UBCD on a bootable USB to use another drivewiping tool to completely erase the C: drive, hoping it'll take the problem with it. No luck. I try to use TestDisk to make my J: my primary active drive, but no luck. I still get the "OS is missing" error. Or sometimes it'll hang at Verifying DMI Pool. Or sometimes I'll get the "NTLDR is missing" error. I get hold of Hiren's and put it on another bootable USB. I first I tried the Boot Windows 7 from Hard Drive option, and I get "Error 15: File Not Found". I tried the "Fix 'NTLDR is Missing'" option (I'm not quite sure why this is even showing up, since I'm trying to get into a HDD with Windows 7 installed. Probably messed up somewhere when I used TestDisk) and I get this list: I'll run through the error messages I get: 1st Try - Windows could not start because the following file is missing or corrupt: \system32\hal.dll 2nd Try - Windows could not start because the following file is missing or corrupt: \system32\ntoskrnl.exe 3rd Try - Windows could not start because of a computer disk hardware configuration problem. Could not read from the selected boot disk. Check boot path and disk hardware. 4th - 8th Try - Same as #3 9th Try - I/O Error accessing boot sector file multi(0)disk(0)fdisk(0)\BOOTSEC.DOS. And computer freezes. 10th Try - computer restarts Needless to say, not a single one of those works. I then tried to open up the Windows 7 exe I have sitting on my J: from the Mini-XP OS on Hiren's, but it won't run because I'm trying to run a 64-bit file from a 32-bit exe. At least, that's the problem according to these guys: http://social.technet.microsoft.com/...-b2f54e9c7d18/ I then borrowed a 64-bit Windows Home Premium CD from a friend to get to the recovery options. But I get the error message: This version of System Recovery Options is not compatible with the version of Windows you are trying to repair. Try using a recovery disc that is compatible with this version of Windows. I pressed Shift + F10 to get to the Command Prompt directly. These are the exact steps I took from there (paraphrased a little): X:\Sources>bootrec /Fixmbr The operation completed successfully. X:\Sources>bootrec /Fixboot The operation completed successfully. I restarted my computer, but it still didn't work. I unplugged the C: drive, then tried bootrec and Diskpart: X:\Sources> bootrec.exe X:\Sources> bootrec /RebuildBcd Total identified Windows installations: 1 [1] \\?\GLOBALROOT\Device\HarddiskVolume1\Windows Add installation to bootlist? Yes(Y)/No(N)/All(A):y The requested system device cannot be found. X:\Sources>DiskPart DISKPART> List Disk Disk # Status Size Free Dyn Gpt Disk 0_Online_465GB_0B_______* Disk 1 Online 1000MB 0B (this is Hiren's on a bootable usb) DISKPART> Select Disk 0 Disk 0 is now the selected disk. DISKPART> List Partition Partition # Type Size Offset Partition 1 System 465GB 31KB DISKPART> Select Partition 1 Partition 1 is now the selected partition DISKPART> Active The selected disk is not a fixed MBR disk. The ACTIVE command can only be used on fixed MBR disks. DISKPART> exit Leaving Diskpart... X:\Sources>bootrec /Fixmbr The operation completed successfully. X:\Sources>bootrec /Fixboot The operation completed successfully. Before I go any further, is there anything I'm overlooking/doing wrong? All I care about is making the J: and Windows 7 bootable again. SPECS: Windows 7 Professional 64-Bit GIGABYTE - Motherboard - Socket 775 - GA-P35-DS3R (rev. 2.1) Crucial Ballistix 2048MB PC6400 DDR2 800MHz (2x2GB) Intel Core 2 Duo E6700 Processor (2.6 (6GHZ) I think... not sure anymore C: HDD - SAMSUNG HD103UJ (1TB, not plugged in) J: HDD - WDC WD5000AKS-00V1A0 (500GB)

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  • Use router as external high powered Wi-Fi adapter

    - by skywinder
    I need a powerful external Wi-Fi adapter for a couple of days. I heard that some types of router support this mode, allowing me to connect the router to my notebook and just use it as an external Wi-Fi interface. Is it possible to connect a router as an external Wi-Fi adapter? How can I determine it? Updated: My purpose is to set the router to monitor mode and check networks around through my notebook to provide better configuration for my network (power, channels, etc). My internal notebook Wi-Fi adapter is too weak for this purpose. Should I use special drivers for that? If yes, can someone describe, step-by-step, how to do it? p.s. I want to use ASUS RT-N56U as an external Wi-Fi adapter on OS X or Ubuntu.

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  • Application Launcher for Hyper-V Server

    - by peterchen
    We are currently in the process of setting up a HyperV R2 Server machine. Though there's not a lot we need to do wihtin the HyperV Server itself, the command line is sure minimalistic. There are a few administrative / Hardware Monitoring tools that we want to run on he machine itself (accessed through remote desktop). I am looking for a simple program/application launcher where we can hook up these maintenance tools (and one to open a new cmd.exe window in case I habitually close the one I'm working in!) However, all tools I tried by now more or less assume explorer is present, and fail in different ways. Before I go and write a simple one myself, any recommendations?

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  • How to play games in widescreen in Windows 7, Dell Studio 1555

    - by blasteralfred
    I have a dell studio 1555 laptop with a GPU inside. The details are below; Hardware details Software details I can play games in widescreen in Vista, but not in 7. I am using Windows 7 Home Premium. I have the latest Catalyst Control Center. Instead of widescreen, the games are running in a classic style, say 1024x768 ratio. When I play need for speed underground, the maximum possible resolution is 1024x768 (all other games are like this). I have no problem with HD videos and anything else. How can I fix this? Thanks in advance...:)

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  • 4 - 7 second delay accessing Mysql across the network

    - by Kristiaan
    Hello, our company has recently purchased a new server with the intention of replacing our aging database server. its a full 64bit 2008 enterprise system, i have got the basic server setup and configured and then installed the 64bit version of mysql on the server, this has then been configured to match where possible our existing server as much as it can. however i have noticed that when it was swapped with the production database server our software systems had an increased delay accessing the mysql database this was anything beween 4 - 7 seconds. i have tried disabling TOE, IPv6 and a few other suggested soultions to this but so far cannot find out where this slowdown is coming from. replacing the server with the production one and the delay goes away. in terms of software and hardware the servers are not very identical at all due to one being windows 2003 std with a 32bit server and the new one being windows 2008 enterprise with a 64bit server. thanks Kris

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  • HTTP traffic through PIX VPN from outside site

    - by fwrawx
    I have a remote site with a website that only allows access from the outside IP assigned to our local PIX. I have users connecting to the local networking using a VPN that need to be able to view this remote site. I don't think this works because the packets want to come in and go out over the same (ext) interface. So I'm looking for a way to make this work using the PIX or setting up a service on a server on the local network to act as a middle-man for the HTTP requests. The remote site doesn't support setting up a VPN to our PIX. The remote website is dishing out pages over a non-standard port. Can I use squid or something similar to proxy just one site?

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