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  • DHCP Server on local machine

    - by EralpB
    Hello I am trying to setup a dhcp3-server on Ubuntu. But my question is more generic, if dhcp server is in a blockbox and all clients are connected to it I think I get what is going on but when dhcp server is installed on one of the "clients" that confuses me. When I send a dhcp packet from that client to the dhcp server, will my ethernet card read and write at the same time? Or will it handle it internally without writing any data to ethernet cable. It's the first time I am encountering these network things so I am a little bit confused. Also I wonder If I am in a big network with lan IP let's say 192.168.0.100 and I install a dhcp server to my computer, can any other computers accidentally get IP from my dhcp server? Every computer has one ethernet card (if that matters?). And every computer is connected to one router. I guess the answer is no because the broadcast message won't reach to my computer since when router receives a dhcp search packet it will answer and it won't let other computers know about it because they don't need to. And without router sending that packet one by one, it cannot travel further. I'd be glad if someone enlightens me. Thank you very much.

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  • Virutal Machine loses network connectivity on Hyper V

    - by Chris W
    We're running a number of VMs on a 6 node failover cluster of blades using Hyper V. We have an intermittent issue (every few days at different times - not a fixed frequency) of VMs losing network connectivity. Console access to the VM suggests all is fine and the underlying blade has normal connectivity. To resolve the problem we either have to re-start the VM or, more usually, we do a live migration to another blade which fires up connectivity and we then migrate it back to the original blade. I've had 3 instances of this happen with a specific VM running on a particular blade however it has happened once with a different VM running on a different blade. All VMs and blades have the same basic setup and are running Windows 2008 R2. Any ideas where I should be looking to diagnose the possible causes of this problem as the event logs provide no help?

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  • How to configure a gateway virtual machine

    - by user225706
    I have a VM-host configured with eth0 (10.145.73.207) and eth1(192.168.101.231), and three VMs connecting the Internet through NAT, with the default gateway of 192.168.122.1. Now I want to configure VM2 as a gateway. I added eth0 (192.168.122.63) and eth1 (172.16.1.109) for VM2. It can connect to the Internet with each of them. I changed the default gateway of VM1 from 192.168.122.1 to 192.168.122.63. However, when I traceroute google.com on VM1, it shows that the packet only reaches 192.168.122.63, no further. Any help is appreciated. Thanks.

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  • I am trying to set up a ubuntu sever 12.04 on my machine [migrated]

    - by Jseb
    I am trying to set up a server on my home network which will eventually host rails. I am not great in linux server and i try to follow the prompt. I did succesfully get to a black screen which then prompts me to a username then password to then do anything ( assuming). However here what i try to do I kinda fellow his tutorial http://www.ubuntugeek.com/step-by-step-ubuntu-11-04-natty-lamp-server-setup.html but however the command where not 100% like him not in same order but same idea. Then i want to install ubuntu server with gui here the command i try with sudo apt-get upgrade sudo apt-get install ubuntu-desktop Which however give me the following error Err http... inRelease w Failed to fetch ht... So been ignored if i try the desktop one i get E: unable to locate package ubuntu E: unable to locate package desktop So i am assuming i am not connected to the internet, so i try the following command sudo vi /etc/network/interfaces here the output it gives me and i know my gateway on my laptop is 192.168.1.1 address: 192.168.1.148 netmask: 255.255.255.0 network: 192.168.1.0 broadcasts: 192.168.1.255 gateway: 192.168.1.1 Btw i do not know the command to get out of vi and saving it. Err http://us.archive.ubuntu.com precises InRelease Err http://us.archive.ubuntu.com precises-updates InRelease Err http://us.archive.ubuntu.com precises-backports InRelease Reading package lists... Done W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/InRelease W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backport/InRelease

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  • Getting FC11 to run under VMware Server, converted from physical machine

    - by Kristian
    I have a FC11 installation that I have converted to a VMware disk image to run om my VMware Server. I converted it with qemu-img, as the VMware Converter software apparently only converts Linux hosts to VMware Infrastructure servers. The disk image boots fine (grub is loaded and boots the kernel) but it seems like the disk is not found by the kernel, and the boot process stalls. Hotplugging USB devices work (the kernel prints debug information) and I'm able to press keys (Ctrl-Alt-Delete for instance). The VMware guest OS is set to RedHat Enterprise Linux 5 (32 bit), and I have tried both the LSI Logic, LSI Logic SAS and VMware Accelerated SCSI SCSI controllers, to no avail. I'm able to boot an installer disk and get into rescue mode and mount the filesystem, so my question is, what do I need to do to the guest kernel / initrd image to make it recognize the virtual disk?

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  • Large Users Profile - Windows 7 - Machine running slowly

    - by Richard
    I have the MD of a client of ours who has a Windows 7 Profile that is currently 14GB thanks to Videos/Music and Documents. The first thing we did was to switch from roaming to local. What I need to know is now the profile is local am I wasting my time by reducing it any further? Does it really make a difference to performance having a large local user profile? Only the 4GB outlook ost that talks to the network frequently. Thanks in advance.... Richard

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  • Need IP port forwarding to access an internel service running on an internal machine

    - by appleluo
    I am trying to configure iptables to do port forwarding for certain request. The scenario is like this: Login node A can be accessed from outside Compute node B that running the service can be accessed from A but not from outside. I want to set up iptables so that a request for the service on B from outside can be accessed through A. A has two ethernet ports: Internal eth0, with ip internal_A and External eth1, with ip external_A. B has 1 ethernet port, internal eth0. let's say its ip is internal_B The service listens to internal_B:5900. We open external_A:10000 for user access. I configure my iptables with the following commands: echo 1> /proc/sys/net/ipv4/ip_forward /sbin/iptables -P FORWARD ACCEPT /sbin/iptables -t nat -A POSTROUTING -j MASQUERADE /sbin/iptables -A PREROUTING -p tcp -t nat --dport 10000 -j DNAT --to-destination interal_B:5900 /sbin/iptables -A OUTPUT -p tcp -t nat -d external_A --dport 10000 -j DNAT --to-destination internal_B:5900 But it didn't work. Can anybody help me?

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  • Per-machine decentralised DNS caching - nscd/lwresd/etc

    - by Dan Carley
    Preface: We have caching resolvers at each of our geographic network locations. These are clustered for resiliency and their locality reduces the latency of internal requests generated by our servers. This works well. Except that a vast quantity of the requests seen over the wire are lookups for the same records, generated by applications which don't perform any DNS caching of their own. Questions: Is there a significant benefit to running lightweight caching daemons on the individual servers in order to reduce repeated requests from hitting the network? Does anyone have experience of using [u]nscd, lwresd or dnscache to do such a thing? Are there any other packages worth looking at? Any caveats to beware of? Besides the obvious, caching and negative caching stale results.

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  • Windows shared printers: Process job on server machine, not the client

    - by asr
    Hi. While working with Linux clients to Windows SMB/CIFS filesharing servers, from time to time I find myself having to print to a printer with no drivers available under Linux. For some reason, the Windows computer expects the job to be sent in an already processed format, so it can be fed directly to the printer in its own, weird language. It would be great if I could send the print job in Postscript or other standard format to the Windows computer sharing this printer, and then this PS could be processed under Windows. Is there a way to accomplish this? Because I don't seem to find the option. Thanks a lot.

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  • Need help diagnosing my machine

    - by Tom Collins
    I have something that just slows my computer to a crawl sometimes. Not running anything big. Yesterday all I had running (besides background apps) were Firefox & Windows Explorer and could barely even switch screens. Nothing showing up in the task manager as hogging CPUs. I have all non-essential services stopped (MySQl & MSSQL) unless I need them. I made some restore points not long ago, but they disappeared. This is a development mach with a LOT of apps installed, so I really, really do not want to re-install Windows. So, what I'm looking for are ideas or tools I can use to help diagnose this problem. The only clues I have is this started right after I installed Office 2013 (with Office 2010 still installed as well) installed Visual Studio 2012 (also keeping 2010 as a co-install) and installed MSSQL 2012 (upgrade from 2008, no co-install) Also, computer runs fine in Safe Mode. I've just ran out of ideas of what to check. Any help / suggestions would much appreciated. Thanks P.S. I'm running Win 7 Pro (x64). Office is also 64 bit. Visual Studio & MSSQL are 64 bit if that option was available (not sure).

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  • pxelinux hanging when booting client machine

    - by Blasphemophagher
    I'm kind of new to all of this, so please forgive any vagueness/misunderstandings on my part. I'm using pxelinux and VMs to create CentOS 6.0 machines that have the same install every time. I have a new VM set to boot from network, but in the process of booting up it gets stuck at "Loading 10.1.1.20:/pxelinux.0" (10.1.1.20 is the address of the server it's getting info from). pxelinux conf: http://pastebin.com/4XfZZPY1 I'm pretty sure all my config files are correct, could it be VirtualBox related? I have both the building server and the new client set to Host-only adapter and PCNET-FAST.

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  • Best practice for setting up SQL server on a Virtual Machine

    - by CrazyCoderz
    This is my first attempt at virtualizing SQL server on VMWare and I want to make sure I am doing things correctly. Should I have SQL server installed on the C: drive / same partition as the OS, Then add a virtual disk for the Data files, say 300GB, and then another virtual disk for the log files say 100GB? Or should I add 2 300GB vdisks, for the data files mirror them in the operating system, and then add a non mirrored vdisk of 100GB for LogFiles??

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  • Can't get bridged networking to work between linux guest virtual machine and Mac host

    - by tgoneil
    I'm trying to establish bridged networking from linux mint vsn 12 in virtualbox to a Mac Lion host. Mac config: Network setting: en3 configured by DHCP Sharing setting: Internet Sharing selected, Share connection from en3 to computers using en3 Virtualbox Linux setting: Network setting: Bridged Adapter, Name: en3 I can ping from host (192.168.2.1) to guest (192.168.2.2) and guest to host, but I Cannot ping from the Linux guest to the outside world. Connection in host is up, because I can ping from the Mac host to the outside world. Something else that's seems weird to me, in the Mac Network setting, the IP Address generated by DHCP says 169.254.243.185. What the heck is that?? When I open a terminal up in the Mac, however, ifconfig shows its en3 inet address as 192.168.2.1.

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  • Building optimal custom machine for Sql Server

    - by Chad Grant
    Getting the hardware in the mail any day. Hardware related to my question: x10 15.5k RPM SAS Segate Cheetah's x2 Adaptec 5405 PCIe Raid cards Motherboard has integrated SAS raid. Was thinking I would build 2 RAID 10 arrays one for data and one for logs The remaining 2 drives a RAID 0 for TempDB Will probably throw in a drive for OS. Does putting the Sql Server application / exe's on a raid make a difference and is there any impact of leaving the OS on a relatively slow disk compared to the raid arrays? I have 5/6 DBs combined < 50 gigs. With a relatively good / constant load. Estimating 60-7% reads vs writes. Planning on using log shipping as well if that matters. Any advice or suggestions?

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  • Recommended apps for new desktop machine install?

    - by Eddie Parker
    I'm hoping to harness the collective tips of superuser to gather recommended apps/configurations to keep a new desktop clean, virus free, and hopefully lower software rot. I ask because I've recently come across tools like dropbox, deepfreeze, returnil, etc, and I'm curious what other ones are out there to protect a new box. I personally am interested in Windows, but feel free to comment on whatever OS you'd like, freeware or otherwise. Ideally specify the price/OS in your answer(s).

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  • Virtual machine won't connect to networking interface

    - by Keyo
    I have moved my virtual box hard drive (.vdi file) from windows7 on a laptop, to windows7 on a desktop. No big deal I thought. The OS is ubuntu 10.10. Now networking is broken. I don't have a solid understanding of windows networking, maybe someone can help. Anyway, the networking no longer works. I've tried to setup eth0. I have virtualbox setup in bridge mode, my wifi connection on windows to an intel card on the virtualbox side. I think it might be something to do with windows not allowing the connection to bridge properly (security issues). I've provided some screenshots, which will hopefully help.

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  • How to enable Ipv6 on my ubunutu 11.04 virtual machine

    - by liv2hak
    I have installed 3 VM's on my PC.(Ubuntu 11.04).I want to setup an IPV6 network to review and test some of the IPV6 tools like NDPMonitor.(monitors ICMP messages of Neighbour Discovery Protocol.) IP v6 addresses are as follows. linux_router - fe80::a00:27ff:fed5:f7e9/64 labhack1 - fe80::a00:27ff:fed2:8bd1/64 labhack2 - fe80::a00:27ff:fed7:2f2d/64 The below commands have been run on both linux_router and labhack1. sudo ip r a 2001:468:181:f100::/64 dev eth0 sudo vim /etc/radvd.conf /file looks like below./ interface eth0 { AdvSendAdvert on; /*means that we are sending out advertisments.*/ MinRtrAdvInterval 5; /*these options control how often advertisments are sent*/ MaxRtrAdvInterval 15; /*these are not mandatory but valueable settings.*/ prefix fe80::a00:27ff::/64 { AdvOnLink on; /*Says to the host everyone sharing this prefix is on the sam local link as you.*/ AdvAutonomous on; /*Says to a host: "Use this prefix to autoconfigure your address"*/ }; }; sudo sysctl -w net.ipv6.conf.all.forwarding=1 I try to do a ping6 -I eth0 fe80::a00:27ff:fed5:f7e9 I get Destination unreachable: Address unreachable.I am not sure what I am doing wrong here.I am a beginner at linux administration.Basically I think I am missing whatever is analogous to physically connecting VM's.Any help that would point me in the right direction would be greatly appreciated.

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