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  • iptables: separate clients from each other

    - by Florian Lagg
    Hello, is there a way to separate clients in a subnet so that they cannot reach each other? The infrastructure currently looks like this: 192.168.0.1/24 Gateway, a CentOS box with iptables. 192.168.0.10-20 Some clients which may reach each other 192.168.0.30 A single client which should not be able to reach the hosts 192.168.0.10-20 should be able to reach the gateway and the internet I don't know if it is possible, maybe you could give me your ideas how it could be done. I cannot influence the machine 192.168.0.30 because it is a virtual machine I want to rent to someone. Thanks.

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  • Centrally manage Windows 7 computers without Active Directory

    - by Sean W.
    I manage three Windows PCs at home using the principle of least privilege. This means that practically every other day when a new version of Java is released, I have to manually install the update using my administrative credentials on each machine. This is starting to become more work than I had expected. I would love to set up an active directory domain at home, but Microsoft has discontinued Windows home server; its replacement, Windows server 2012 essentials is much more expensive (about $500). Are there any free (preferably as in speech) that would allow me to centrally manage the software installed on each machine in a manner similar to that of active directory? I'd also like to find a way to centrally manage security settings, but I doubt there's an equivalent of group policy. Samba 4 would be an ideal solution, but according to its own developers, it is not yet stable enough for production use.

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  • Ping IP: connect: no such process

    - by Matthew
    I am trying to figure out this issue and am getting a weird error. We have two boxes which used to talk to one another on the network. Both are reachable via ssh from a separate network, which means they are able to talk to their default gateways just fine. When we try to ping from the linux machine to the linux machine, we get a bunch of timeouts. When we try to ping from the linux box back, we are getting connect: no such process. I can't seem to find much documentation on this error, though there consistently seem to be references to VPN stuff when googling for this error. The

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  • One way sync with either Dropbox or Google drive on linux and windows

    - by sup
    I could not google this one. I would like to use Dropbox or Google drive only as backup, so I would like to ensure I only upload to those services and never download (unless done manually via the web interface). There would be several of us uploading stuff to one account, so we would need to ensure we don't accidentaly delete something on another guy's machine by doing some changes on our local machine. Is there a simple way to do this automatically - i.e. by running a daemon that will upload eveyuthing in a given folder but never download anything? I am on linux, so that complicates things a bit, but I am also interested in windows solutions.

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  • Cannot flush the DNS on Snow Leopard 10.6.8

    - by Andy Woggle
    I have an absolutely bizarre problem and it has STUMPED me.. I cannot seem to flush the DNS on my Snow Leopard 10.6.8. I have tried sudo dscacheutil -flushcache , i've tried dscacheutil -flushcache and it hasn't worked. I'm building a website, and changed the directories yesterday. Now when I check it on my other machine, it works fine. When I get somewhere from distance to check, it works fine, but it's seemingly stuck in the DNS on this machine as the CSS is not showing. Is there a hard-flush method (if that makes sense)? The two above did not work.

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  • Can Windows Home Server be used on an active directory domain?

    - by Parvenu74
    The situation: an Active Directory network with a few dozen machines. Most of the machines have the same vanilla image applied to them so if there was a hard drive failure getting the machine back up to the standard network image would be quick and easy. However, there are a handful of (eight) machines which have rather unique setups (accounting, developers, the "artist" with CS4 and such). For these machines we would like to use Windows Home Server since the backups are automatic and recovery from a machine failure is quite painless. The question though is whether or not WHS can be used on an A/D network. If not, what "set it and forget it" backup/imaging product is recommended for this scenario?

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  • "SIOCSIFADDR: No such device" after restoring backup

    - by Paul Tomblin
    I bought some new hardware, and tried to restore my backup on it. When I boot, I don't get a network connection. If I type "ifup eth0" on the command line, I see the messages: SIOCSIFADDR: No such device eth0: No such device lspci shows an ethernet controller (Intel 82546GB). ifconfig does not show any controller except loopback. I tried installing bare Debian on the machine and the network worked then, but now I want to make it like my old machine was. Googling this problem only seems to find people having this problem in VMs. I'm not in a VM.

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  • Will the Driver Support for Intel HD Graphics be Improved in 12.10?

    - by Hiranya
    I recently installed Ubuntu 12.04 on a HP Pavilion dv4 laptop. This is a core i7 machine with Intel HD graphics and also a separate nVidia VGA card. I had a lot of issues getting Ubuntu 12.04 working on this system. First there were issues booting up the live CD for installation. I worked around that by using the 'nomodeset' option. Then I continued to have similar issues after installation has completed. So I had to permanently add the nomodeset option to my GRUB boot configuration. At the moment I have a working installation but there are many issues: Ubuntu GUI is a bit flaky at times. The mouse pointer goes on and off when hovering over certain icons. Certain things doesn't get rendered properly on the screen. I can't access any of the tty consoles. Hitting Ctrl+Alt+F[1-6] gives me a blank screen. And once that happens I can't even come back to the UI by hitting Ctrl+Alt+F7. I've realized that tty consoles are actually working. I just can't see the text. If I enter a command like 'sudo reboot' into the empty screen the machine reboots. Can't get external displays (monitors, projectors etc) working. But I think this is probably because the VGA out is wired to the nVidia card which is not being used by Linux. colord program crashes every now and then triggering a popup message. So my main question is, will the support for Intel HD graphics be improved in the next release? Or will I have to keep using the nomodeset option in the new release too? Also I appreciate if anybody can shed some light on any of the issues listed above. Thanks in advance.

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  • How do I boot Windows 8 into Safe Mode?

    - by Earlz
    I have Windows 8 Enterprise x64. It's installed a virtual machine. After trying to update VMWare's guest extension it black screened. After resetting it, now the virtual machine won't boot. It just says "automatic repair couldn't repair your PC" Everything I do ends with an error or it coming back to this screen. If I go to Troubleshoot Advanced Options Start up settings and then go to Safe Mode, all it will do is say "preparing automatic repair" and then "diagnosing your PC" and then will come straight back to the "automatic repair couldn't repair your PC" screen. It's as if it doesn't even attempt to go into safe made. Is there anything else I can do before I reformat?

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  • Generic Windows 98 USB Drive drivers?

    - by Electrons_Ahoy
    I've got an old Win98 machine that I'd like to pull some data off of. (Tens of gigs of data, actually.) The machine still runs fine, but due to the age, it doesn't have a cd burner, and the pre-NT networking won't connect to SMB shares without a fair amount of wrenching on the registry that I don't really want to do. What I really want to do is plug in an external USB hard drive and copy the files. But - Win98 didn't ship with generic USB drive drivers, and external drives don't ship with them these days. Can anyone point me at a reputable generic driver I can install?

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  • Client PC not booting when certain TFT plugged in - TFT or graphics card failure?

    - by Chake
    here comes something quite strange: On a client machine (DELL Vostro 420) we experienced problems when booting: when turning on the machine beeps normal but doesn't display anything and doesn't boot. After some testing I found out, that this only happens if one (of the two) monitors (Iiyama ProLite E2472HDD) is plugged in while booting. If the other monitor (TFT 2) is plugged in everything is fine. Here a small illustration, TFT 1 is the bad guy: TFT 1 | TFT 2 | failure x | x | x x | | x | x | After BIOS-Phase I can safely plug in TFT 1 and everything works just fine. The question is, what can be done to avoide this behavior: Change monitor? (Iiyama ProLite E2472HDD) Change graphics card? (GeForce 9800 GT) Other suggestions?

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  • Samba share external USB device

    - by bioShark
    I managed to share stuff from my Ubuntu 12.04 to my private network, and the data is visible from a Windows machine. I even shared a hdd that has windows on it. So everything seems to work fine. When I want to share a mounted device (USB pen drive, USB HDD... etc) however, I get from the Windows machine: Access denied on file \... I realize that this is due to the missing rights on the mounted folder. By default a mounted folder gets the equivalent of 700 : drwx------, and the owner myself. But, I can't seem to change the rights on the external device... they remain 700. Is there a special trick I need to do in order to share NTFS mounted usb devices? Thanks P.S. from this Question I see that NTFS devices can not be shared....is this true? It's a bit strange, because I have in my PC 2 HDD's with 3 NTFS partitions, and I can share them without a problem.

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  • Limit a process's relative (not absolute) processor consumption in Linux

    - by BobBanana
    What is the standard way in Linux to enforce a system policy to limit the relative CPU use of a single process? That is, on a quad-core machine, I never want a process to use more than 2 CPUs at once, even if the process creates more threads. I do not want an absolute time limit, just a relative limit so that one task cannot dominate the machine. This is also different than renice, which allows a process to use all the resources but just politely step aside if others need them too. ulimit is the usual resource limiting tool, but it does not allow such CPU restrictions.. it can limit the number of processes per user, or absolute CPU time, not restrict the maximum number of active threads of a single process. I've found a couple of user-level tools, like CPUlimit, but not a system level tool or setting. Does such a standard resource controller exist in Linux (Red Hat Enterprise, if it matters.) If there is such a limit imposed, how would a user identify it?

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  • Is there a suitable chain for iptables when eth is in Promisc mode?

    - by user1495181
    I have a fron-end machine. Machine have2 eth cards. I want to use netfilter queue to do some checks on the packets. I set eth like this: ifconfig eth0 0.0.0.0 promisc up ifconfig eth1 0.0.0.0 promisc up I want to have an iptable rule like this(only example): iptables -A INPUT -i eth0 -j LOG --log-prefix " eth0 packet " but the packet is no passed through the iptables ,because it dosnt target to this MAC. Promisc mode didnt help. I saw that there is a way to add iptables chain for PROMISC, but need compilation... Is there any simplier way to have iptables rule when packet is not target to this eth. Currently i bypass this by creating a bridge between 2 eth and put rule on the FORWARD, but i done want to create bridge.

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  • Ping reply not getting to LAN machines but getting in Linux router Gateway

    - by Kevin Parker
    I have configured Ubuntu 12.04 as Gateway machine.its having two interfaces eth0 with ip 192.168.122.39(Static) and eth1 connected to modem with ip address 192.168.2.3(through DHCP). ip-forwarding is enabled in router box. Client machine is configured as: ip address 192.168.122.5 and gateway 192.168.122.39 Client machines can ping router box(192.168.122.39).but when pinged 8.8.8.8 reply is not reaching Client machines but in the tcpdump output on gateway i can see echo request for 8.8.8.8 but never echo reply.Is this because of 122.5 not forwarding request to 2.0 network.Can u please help me in fixing this.

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  • Windows 7 Intermittent Connection Issues (Continuously "identifying")

    - by andrewktmeikle
    I have an issue solely with my desktop windows 7 machine on my network (the network has multiple different devices, on the same and different operating systems) and the issue is that irregularly, although sometimes frequently, I briefly get disconnected from the internet (briefly is for around 5-10 seconds). However, I never loose the bars on the wifi thing, eg I don't get the yellow triangle, but it goes to the identifying stage and then reconnects. The reason I noticed the problem was when I was streaming music it would stop and I would refresh the page and it would start working again ( turned out it was because it took that amount of time to get connected again). So my question is, what would cause the intermittent issues and start the "identifying" process again. I don't think its my router, because no one else is having problems, so the other option is that its a problem specifically with my machine. I'm connecting to a Netgear DG834GT router, and I'm using a Edimax Wireless-N150 USB Adapter. Anyone have any ideas?

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  • How can I display host name on windows desktop

    - by Martin
    I do a lot of work on Windows Server 2008 remote desktops and often lose track of which host I am currently logged on to. Is there a way of displaying (without installing any non-standard apps) the host name or IP address of the host I am connected to in either the wallpaper or the notification area? I tried creating files in the desktop with the name of the machine - but my roaming profile shows the same set of desktop files on every machine, so that was scuppered. Duh! In shell windows this is easy: just set the prompt to display the host name. Surely there is a simple way of doing the same for the graphical desktop.

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  • Cannot get script to run at startup (tried all the simple answers)

    - by Carey Head
    I have Ubuntu Desktop 12.04 LTS running great on an older Acer desktop. I want to use this machine as an in-home server for hosting Minecraft. The command to start the Minecraft server is java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui and that works great when I cd into the correct directory and execute the above. I created a script to do this: #!/bin/bash cd /home/myuser/minecraft-server1 java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui & cd /home/myuser/minecraft-server2 java -Xmx1024M -Xms1024M -jar minecraft_server.jar nogui & exit 0 I made this .sh file executable, and it too runs great when I start it manually from the terminal. The problem I'm having is getting these to execute at startup. I have my user account on this machine to auto login. I have tried the following: Adding the following to "Startup Applications" : sh /home/myuser/myscript.sh (Nothing happens on reboot) Adding the same to /etc/rc.local (Nothing happens on reboot). I even tested this one by running /etc/rc.local from the terminal, and it executed great. Just not at boot/auto login Added the lines from the script directly to rc.local (Nothing happens on reboot). I can't help but think that there's something I'm missing. The script executes great when run manually, but will not run at boot/auto login. Many thanks in advance.

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  • Recovering database files from a corrupted VHD

    - by Apocalypse9
    We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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  • SSL issues with puppet agent at openSUSE

    - by Roman Grazhdan
    I have a master running at my vps, and it has a simple helloworld manifest which works fine with any ubuntu machine I have. It connects, exchanges keys and creates test file allright, so I'm sure it's not server issue. The agent which is running at a virtual machine with openSUSE says: err: Could not request certificate: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed. This is often because the time is out of sync on the server or client I believe it's probably a broken or missing lib, since the package is not built very accurately - it wouldn't start out of the box because of wrong path to lockfile, for example. So how do I figure out what exactly is wrong here? The time is allright, I've checked it. I probably could do without SSL if it's possible, since that SUSE machines are just for training, but it's the last opportunity.

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  • Outlook 2010 and Exchange 2003

    - by user69644
    We've had some issues with a user who has upgraded to Outlook 2010 and attached to an internal Exchange 2003 SP2 server. They get errors more or less saying cannot send, contact your administrator and then a long error string whenever attempting to send. They receive just fine - but can't get any outbound flow. We recreate the users profile on another Windows 7 machine with Outlook 2010 and it worked fine. Concerned this might be an issue that rears it's ugly head later or at some random time. We noted some KB docs about the issue recommending registry changes - we've reviewed and ensure these changes were made and still have the issue on the one machine. Any thoughts?

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  • Remotely start VNC server on computer with no Admin password

    - by Joe M.
    I'm trying to remotely access a particular computer of mine and it seems that VNC has stopped. I can tell that the computer is still running because I can VNC into another machine on the same network and can see my target machine under the Network section in Windows Explorer and can also ping it succesfully. To summarize: I own the target computer I am currently too far to physically access it Remote Desktop Connection feature of Windows is not enabled The computer normally runs a VNC server, but it seems to have stopped The computer is definitely on and connected to the network The computer has no password on the Admin account I can VNC into other computers on the same LAN Given these conditions how can I get into the target to open VNC server, or even just reboot the target (VNC should open on startup)? I have tried PsExec and get "access is denied", and also tried "Connect to another computer.." from the Computer Management console and also get "access is denied".

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  • Dual boot centOS and Win7

    - by user1855965
    I posted this on stackoverflow, but it looks like superuser would be more appropriate. I have a CentOS 5 machine that runs Windows 7 as a dual boot. CentOS is the main OS and each OS is set up in a specific hard drive. This was set up before I joined the company and I don't really have need to run Windows now. My question is: can I, from CentOS, reformat the Windows HD, change GRUB settings and get the HD to be available on CentOS? Happy to provide more info if this helps. Many thanks for your help and apologies if this is a very simple issue... I don't want to blindly test things on this machine as it is used on a daily basis by several users.

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  • Can't connect nonlocally after 12.10 upgrade

    - by user101815
    I've just upgraded one of my systems from 12.04 to 12.10. Now I can't connect on that system beyond my local network. Connections within the local network seem to work fine, and I can make nonlocal connections from other machines (like the one I'm asking this question from). I suspect that some routing information has been messed up, but I don't know where to look for it. It's not a nameserver problem -- pinging outside sites by their IP addresses doesn't work either. I have another laptop next to this one, also running Kubuntu 12.10. On the one that can't connect, arp produces no output. On the other one, it produces 192.168.0.1 ether 00:23:69:fa:ce:ae C wlan0 On the working machine, the output of netstat starts with some tcp entries. On the nonworking one, those entries are absent. I asked this question on the Ubuntu forum but haven't gotten any answers there. One further complication: since the troublesome machine has no outside connection, it's extremely difficult to download anything to it. For what it's worth, "ping 8.8.8.8" produces "connect: Network is unreachable". Update: after a lot of fiddling, I have my external world back. I don't know what the key action was, but the first indication of progress was that "ping 8.8.8.8" worked. At that point I still didn't have a working nameserver, so external URLs didn't work. But I did this (based on an online post, of course): sudo dpkg-reconfigure resolvconf and answered Yes to all prompts. That did the trick!! Apparently my problem was unique, or close to it, since I couldn't find any online references to it: local net working, remote net not working, including explicit IP addresses. So I suppose that if no one else has this problem, no one cares about the solution!!

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