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• Network Role based routing

  - by Steve Butler

  Apologies my networking skills are a tad rusty. I'm looking for a way to setup a system that gives me the ability to setup Role-based access to specific network resources. For example, i have three private subnets for specific groups, users will need access to one one or more subnets. I'd like to have all client machines on the same subnet/vlan, and then use 802.1x to authorize into a router(NAC device/whatever), the router would then see what user had authenticated(huge plus if it could determine AD group), and then allow routing to one or more of the three private subnets based upon their group membership. I've looked at packetFence, and it appears to work by assigning a client to a VLAN, but i'd still need a way to route some users into different back-end networks.

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• Ubuntu on Oracle VirtualBox: Shared folders

  - by Rosarch

  I looked at this question, but it didn't help. I'm running Windows 7 as a host with Ubuntu 10.10 as a guest with VBox 4.0. I want to have a shared directory between the two. I have installed Guest Additions. I went to the VBox control panel in Windows, added a Shared Folder (sharename Shared_Folder), and chose "Auto Mount". A directory named "sf_Shared_Folder" appeared in /media on Ubuntu, but when I put files in that directory from an OS, I can't see them on the other one. I then tried to create a directory without automounting (sharename collectivefiles), and to run the following command: foo@foo-VirtualBox:~$ sudo mount -t vboxsf collectivefiles FileShare /sbin/mount.vboxsf: mounting failed with the error: No such device What is causing this error? I rebooted both the VM and VBox itself, but I'm still observing this.

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• Does PCI bus really occupy 1.8GB

  - by Neil

  I am using a Dell Vostro 1700 laptop which currently has 2GB of RAM. I was considering buying some more memory to upgrade it to 4GB. I am running 32 bit Windows Vista and I know that there can be issues that prevent it from making use of a full 4GB which I believe relate to the fact that memory mapped devices, e.g. graphics card, also need to be allocated addresses in the 4GB range addressable with 32 bits. Consequently I was looking at device manager - resources by connection - memory to see what devices where allocated what memory addresses. I was surprised to see that there was an entry for [80000000 - F3FFFFFF] PCI bus. That is a 1.8GB range of addresses. When I expanded it the only thing in it was [E0000000 - EFFFFFFF] NVIDIA GeForce 8600M GT which is only 256MB. So my question is does the PCI bus really occupy 1.8GB of address space and will it prevent my computer from making use of any more memory than it already has.

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• How do I bridge a connection from Wi-Fi to TAP on Mac OS X? (for the emulator QEMU)

  - by penx

  I'm trying to setup a bridge between my Wi-Fi connection and an emulator (QEMU). I need a virtual machine to be on the same LAN as the host, with its own IP address. QEMU requires using a TAP (virtual network device) so I have installed tuntaposx, have it running, and can open up QEMU using a TAP: qemu-system-arm -kernel zImage.integrator -initrd arm_root.img -m 256 -net nic -net tap,ifname=tap1 -nographic -append "console=ttyAMA0" I have a script that configures the bridge once QEMU has opened up the TAP interface: sysctl -w net.link.ether.inet.proxyall=1 sysctl -w net.inet.ip.forwarding=1 sysctl -w net.inet.ip.fw.enable=1 ifconfig bridge0 create ifconfig bridge0 addm en1 ifconfig tap1 0.0.0.0 up ifconfig bridge0 addm tap1 ifconfig bridge0 up If I manually set an IP on the VM, I can ping from the VM to the host, but not from the host to the VM. Also, I can't access the rest of the network from the VM - including not being able to set an IP over DHCP. Any ideas?

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• RocketRaid gives me stuttering computer

  - by Dan

  I have a SANS DIGITAL TowerRAID TR8M-BP (with the RocketRaid 622 raid device) with 5 x SAMSUNG Spinpoint F4 HD204UI 2TB 5400 RPM SATA 3.0Gb/s harddrives in a raid 5. It connects via 2-esata cables. My drivers are up to date. When I'm writing data to the drives my computer stutters (meaning freezes for a 1/2 second every 2 seconds or so). My screen freezes, my music goes into a loop, its really annoying. I get the same thing in windows 7 as I do in linux. The only difference is it seems to happen less in linux, but occassionally linux will crash (I've never had linux crash for any other reason, so I'm assuming they have poor linux drivers and kernal mod). Any tips for how to deal with this? Thanks

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• solving network connection problem on xp

  - by doug

  Hi there I feel so stupid, because I have to fix my dad computer(which was mine years ago). So it is an old computer on which I have installed windows xp and the drivers for main-board. The device manager says that I have no more problems with the hardware. That computer has to connect to a router from my room but it doesn't. On ping 192.168.2.1 I get "Request time out"., The other computers are connecting to that router. Only the old computer doesn't connect to the LAN and later to the internet. Also it doesn't get a good IP(from the same class). After running ipconfig command I know that i have an IP with 169.... What can I do? Do you have any tips for me?

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• Setting up WiFi extenders... is it possible to daisy-chain them?

  - by Bigbio2002

  At a location with limited cabling, I've had to set up WiFi signal extenders to cover the whole area. Here is a crude diagram... Internet - WiFi/Gateway - Extender 1 - Extender 2 | | PC (ethernet) WiFi device I was able to successfully daisy-chain three together, and I can access the internet from WiFi devices connected to the farthest extender. Is this a supported configuration? If not, what kind of issues can arise from it? The reason why I ask is that the PC keeps reporting IP address conflicts, and I'm wondering if that's caused because of the way this is configured. Additionally, I noticed that the extenders named their own SSID similar to the one they are connected to, but with a suffix. Would there be any issue in naming them all with the same SSID, to enable seamless roaming as you would with multiple standalone APs?

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• Session cach and tmp folder error on cPanel Centos

  - by Danialzo

  One of my clients has come across multiple breakdowns in their websites with the following error PHP Code: Warning: session_start() [function.session-start]:open(/tmp/sess_1d6616afe1b8a0d91a8d9ec29254b453, O_RDWR) failed: No space left on device (28) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/index.php on line 177Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in /home/***/public_html/system/library/currency.php on line 45&#65279;Notice: Error: Can't create/write to file '/tmp/#sql_4c5_0.MYI' (Errcode: 28) Error No: 1 They are experiencing this problem while: Nothing has been recently changed on the server tmp and other folders are occupied with not more than 10% of their total space The error come and goes I would really appreciate it if anyone could guide me through. Thanks in advance

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• Is there a way to share a scanner with an Airport Extreme?

  - by Electrons_Ahoy

  I've got an Airport Extreme as my home network's router. (Sidebar: I love it.) The printer sharing is pretty phenomenal - I've got my printer hooked up to the base station and all the machines in the house can print to it just fine. However, I have one of those combined scanner/printers, and nothing on the lan seems to be able to see the scanner. Is there a way to get the Airport Extreme / Bonjour to also share the scanner half of the device? For the record, this is an all Windows LAN, so I'm using Bonjour for Windows to get the print sharing to work. Also, I'm hoping to not add a whole stack of extra software to the ecosystem - only one machine in the house needs the scanner, so I can just plug the printer back into that machine and share the printer that way. Still, the Airport and Bonjour seem fancy enough that this seems like it should be doable.

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• Can't downgrade or update jailbroken iPhone

  - by showline2

  I can't update or downgrade my iPhone 3GS, Firmware 4.3.5 tethered with redsn0w. Whenever I try to update it, I get a "device isn't eligible" error. I researched on how to do that, like changing host files, but none of them worked for me. I use OS X Snow Leopard. ## # Host Database # # localhost is used to configure the loopback interface # when the system is booting. Do not change this entry. ## 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost 74.208.10.249 gs.apple.com This is my host file – not sure if it's the orginal one or not.

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• Sudden slow read & write speed on all IO

  - by user23392

  I have a custom built rig that has 2 storage drives. for OS: Western Digital 1.0TB HARD DR 64MB for other stuff: Corsair Performance 3 128GB (SSD) [ expected read speed: 400 mb/s ] The system was incredibly fast for a couple of months, then one day i was playing a game then it started to get buggy (some sounds and objects disappearing), i stopped the game and the system seemed to be unstable so i had to shut it down, next morning i couldn't start it up, it was saying something about corrupt device. I formatted both disks and installed a fresh copy of windows, all i can say that since that day the system was never like before, it takes 10 minutes to boot up (the icons and desktop slowly appear). but once it's done the slowness isn't as noticeable. Here's my benchmark on the HDD ( read speed - write speed ): And the SSD: Anyone knows what could be the issue?

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• Problem with Windows Boot Manager after using GParted

  - by Cenoc

  I Get the follow: Windows failed to start. A recent hardware or software change might be the cause. To fix the problem: Insert your windows installation disc and restart your computer. Choose your language settings, and then click "Next." Click "Repair your computer." If you do not have this disc, Contact your system administrator or computer manufacturer for assistance. Status: 0XC0000225 Info: The boot selection failed because a required device is inaccessible. After I tried to expand the Windows partition. I dont know where I put the Windows 7 CD and I was wondering if anyone knew of any way of fixing this problem? I'm guessing I deleted something I shouldnt have deleted....... I actually wanted to get some more space at the expense of the recovery drive. Thanks in advance!

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• MacBook repeatedly disconnects from WiFi

  - by redwall_hp

  I have an early 2008-model MacBook (2.4GHz). The WiFi router I have at home is a Linksys WRT54GX2 that I have had for a few years. My MacBook has recently started disconnecting from the router every few minutes, which is rather annoying. I can reconnect again without having to restart the router or anything, as it seems that the MacBook is just dropping the connection. I have tried changing the channel on the router, and upgrading the laptop from Leopard to Snow Leopard made no difference either. I'm only about six feet from the linksys device, so distance isn't an issue. This only happens with the Linksys router, while I can use the local library's open network without issue. The problem also seemingly becomes more pronounced after midnight. Any ideas as to what the problem could be?

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• Need Assistance on ASUS K55V USB ports not working

  - by Pascal Schilling

  I have a K55V ASUS laptop, W7 Home (64bit). Whenever I try to use a mouse (or any other USB device), it doesn't work because of a driver problem. The automatic update tries to update the driver and requires me to reboot directly after. It doesn't work. Windows update then wants to re-attempt the update and then I have to reboot (etc). Now, after 10 tries it still doesn't work. Can some one help me out on this? No USB ports work at the moment, it has 2 USB 3.0 ports and 1 USB 2.0 port.

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• How to switch easily between a 5.1 headset and 2.1 speakers ?

  - by Wookai

  I have a 5.1 headset that I mostly use for gaming and watching movies. It is connected using 3 jacks to the rear panel of my motherboard (plus one for the microphone). I also have some small 2.1 speakers that I sometimes use to listen to music or to share a video/movie with someone. For now, what I do is crawl under my desk, and switch the cables. As my motherboard has 7.1 capabilities, I am wondering if there could be a way of having all 4 jack cables always plugged in, and switching on which device to output the sound programmatically. Has anybody had a similar problem, and how did you solve it ?

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• What is the "real" difference between a NAS and NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over standard ethernet, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over NFS on servers?

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• Distributed website server redundancy

  - by Keith Lion

  Assume a website infrastructure is very complicated and is fully distributed (probably like most large web companies). Am I right in thinking that although there are all these extra web servers to handle multiple client requests, there is still a single "machine" whereby users must enter? I am guessing this machine will be the one physically associated to the IP address? I ask because I need to know whether, in places where distributed systems exist, there is still a single point of failure- usually the control node or, in this example, the machine connected to the public internet? Surely there cannot be two machines connected to the internet, as they would have to have different IP addresses? This "machine" may not be a server per se, but maybe it is a piece of cisco equipment. I just need to know whether, in the real world, these distributed systems still have a particular section where they depend on the integrity of one electronic device?

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• Can I backup my IMAP Gmail account locally using only Alpine?

  - by BasicObject

  I recently discovered cli email clients and have fallen in love with their speed and simplicity. After playing around with mutt and alpine I decided I favor alpine. I am a Gmail IMAP user and have many years of emails that I'd like to store locally. Is there a more or less convenient way to retain IMAP functionality and backup only the emails that haven't been backed up already on a weekly basis? I have alpine setup with my Gmail with IMAP and it's working great. I'm just wondering if there is a way to make an offline backup or "archive" locally on my computer while retaining the multi device access that IMAP offers. I apologize if this has been asked before, I did search for it and did not find my answer. Thank you for reading.

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• Newly installed DIR-615 - how to connect to the wireless?

  - by JK123

  I've just installed a D-Link DIR 615, but can't figure out how to connect to the wireless.. When I double click my wireless icon in the tray, it does show the new network. Its starts the "WiFi protected setup wizard" and the first thing it asks for is the "Device Ownership Password". I have no idea what that is - I've tried the PIN and the router password. On the next page it says: SSID: _(name)__ Security type: _wpa2 personal aes ccmp_ Password: _some long key that is not what I entered during router setup_ I change the key to the one I created when setting up the router. I've also tried leaving the key as it is shown in the dialog. But it does not connect either way. All it says is "Configuration failed" So how do I connect to the new wireless network??

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• Slow performance with WAMP localhost access from other devices

  - by Adam

  I setup a localhost WAMP server and other device can access my localhost site on my win8 laptop with computer name instead of IP (bc I have use DCIP so that the wireless router can assign me IP otherwise it will not work). However, problem is that the website (WordPress), access speed is extremely slow on other devices other than my localhost computer, usually a 3s task take at least 10 seconds. (i.e. view my localhost site with computer name in a phone within the same wireless network.) Is that normal? What could be the reason causing it? Thank You

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• Backup solution

  - by user66115

  We are currently looking for a new backup solution. Our current network is 5 remote location with a tape backup in each plant. Right now we are looking at a MPLS VPN and running backups out of our main plant. The main thing that we backup are user private folders and department files. And each plant has it's own file server that houses CAD drawings. My main plan is to have every thing but that CAD drawing at the main faculty. We would start with a main backup of the drawing files and then do change backups back to the main plant. Besides tapes what would be the best way to backup. Our contact at Pc Connection is point us toward a Tandberg Data device.

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• Easiest way to move my Windows installation to an SSD?

  - by Jon Artus

  I've taken the plunge and bought an SSD and want to move my existing Windows installation over. The current hard disk is 500Gb, but I've trimmed the contents down to about ~40Gb. I'm transferring it across to a 100Gb SSD and looking for the easiest way just to copy everything across and set the SSD up as a boot device. I've looked at a few tools like Macrium Reflect, but they don't seem able to restore to a smaller drive. Do I need to go for something like PING to do this? I'm trying to avoid scary Linux-based boot utilities if possible, does anyone know of an easier way?

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• Xen VGA passthrough: is it possible to have dual GPU's with single monitor

  - by user489481

  I hate dual-booting between Windows when I want to play a game and Linux when I need to work. I don't fancy running Linux in a VM and Wine almost never works for me. So, I'm thinking about buying a new mainboard and CPU that is compatible with Xen's VGA passthrough and HVM virtualization. I want to be able to switch between the Linux Dom0 and Windows DomU with ease, but the problem is I need two GPU's and have only one monitor. Right now I have a nVidia GTX 260 in my PC, but I also have a Radeon 4850 sitting in my closet that I was going to sell. My question is, can I salvage the Radeon card to run the Dom0 and have the nVidia card run the DomU while having some kind of device/software to connect them a single monitor? Power supply and airflow issues aside. If not, what would you suggest? Is this even possible?

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• SonicWALL NetExtender - Client Install?

  - by JArmani

  We are about to push out a new VPN solution for our organization. One of the beautiful things we saw in SonicWALL's SSL-VPN was the thin, browser-based solution of NetExtender. Does anybody have experience with this? My specific concern is that, at least in Windows 7 during testing, it prompts for admin credentials to install the ActiveX NetExtender plugin, which is standard for installing anything in a Windows domain environment. But doesn't this mean I actually have to go in and install the client on all domain laptops that will be using the VPN in the field? They wouldn't actually be able to simply visit the site and run the client, as advertised? By the way, we're using the SonicWALL NSA 3500 device. We do have ManageEngine's Desktop Central, which can push out software installations, but it usually has to be in the form of a .MSI package. Is there any solution to this, besides hitting up all my organization's computers?

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• What does SQL Server do if you select more than 1 full backup when doing a restore?

  - by Rob Sobers

  I have a backup file that contains 2 backup sets. Both backup sets are full backups. When I open SQL Server Management Studio and choose "Restore..." and pick the file as my device, it lets me pick both backup sets. The restore operation completes without error, but I'm not sure exactly what SQL server did. Did it restore the first one, drop the database, and then restore the second one? Will it always let the most recent full backup prevail? It doesn't seem to make sense for SQL server to even allow you to select more than one full backup.

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