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• Can USB Hubs affect peripheral performance?

  - by Daniel Rasmussen

  Like many laptops, mine has 2 USB 2.0 ports. I'm looking to purchase a USB hub for my peripheral devices. I'm also planning on purchasing a laptop cooler with two USB powered fans, which connects to a USB port but can extend the plug, so it doesn't use one up. (Sorry for the poor description; see the link for a picture.) My questions are these: Can one plug 'too many' peripherals into a USB port? Can I plug my fans into a port, then the hub into the fans, then my keyboard and mouse, mic, and webcam into the extender..? Is it possible to draw too much power from a port? Secondly, will a USB hub affect the performance of any of my devices? I'm mostly worried about my mouse and keyboard. I like wired mice because I've noticed some lag in my Bluetooth mouse.

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• How to stop scheduled chkdisk on windows 7?

  - by AndrejaKo

  Hi! I have a problem with windows 7 64-bit. I was trying out chkdsk command line options and scheduled a chddsk /r on next start. After that I disassembled the laptop on which I set the chkdsk. After I reassembled it, windows gets normally to the point where it should start the check and then hangs when the countdown reaches 1 second. During the countdown, it doesn't detect any input from keyboard. At first I thought that I didn't correctly install the keyboard, but under GNU/Linux, everything is working fine and I can normally mount the windows partition . So is there any way to stop the scheduled chkdsk? I really don't feel like reinstalling windows again because I just finished setting up my tool-chain the way I like it and compiled about 6GiB worth of dependencies I need for some project I'm working on.

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• LAN access via USB from Ipod Touch?

  - by Alec

  I need to browse the local web server from my Ipod Touch to test apps we're developing. I'm not allowed to install a separate wireless access point which would be the easiest solution. Can I use the USB cable for this? Also, the local PC is a Dell Mini 9 running Ubuntu. Has anyone managed to use the wireless port to create an ad hoc connection to an Ipod Touch so the Ipod can browse the Ubuntu web server? This would be an alternate option for me. Thank you!

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• Why did my laptop turn off?

  - by darenw

  Normally I can slip my running laptop into a backpack, go somewhere, and if it's no more than about half an hour later, it'll still be running. At the destination I plug in the AC power unit and all is well. I run it off of the AC unit before and after the trip, have the screen at less than full backlight brightness, and don't have any peripherals that burn power. Sometimes the wireless switch accidentally slides in the backpack, and that causes extra power to be used and the laptop dies before I reach the destination. Sad, but so be it. But sometimes the wireless switch is off, I've reached the destination in less than 30 minutes (typically 10-20 min), and I know the battery was fully charged, yet the machine is off. Is there a way to determine, after the fact, why the machine shut itself off? I'm running Linux on a fairly powerful Gateway with 4GB RAM, fancy nvidia graphics, dual core cpu, chosen more for number crunching power than battery life, but should last easily for half an hour if not an hour.

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• Ubuntu 9.10: switch in KVM, mouse is detected but not usable immediately

  - by CarlF

  I use a KVM switch to jump between my tower and laptop, both placed on my desk. With Ubuntu 9.04 this worked perfectly. In 9.10, when I switch to the tower, then back to the laptop, the mouse is detected (as shown by /var/log/messages) but moving it has no effect. If I use Ctrl-Alt-F1 to switch to the TTY, then Alt-F7 back to Xorg, the mouse starts working. The tower is running Windows 7, but that shouldn't matter. Sometimes, but not other times, the USB keyboard on the KVM switch is also not usable and I have to use the laptop's built-in keyboard to switch to the TTY. The laptop has two monitors, the built-in and an external. It's (obviously) the external panel that is attached via the KVM switch. Any suggestions? Report to Canonical as a bug?

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• Windows 7 Utlimate x64 - No Internet access

  - by rafek

  I've just installed Windows 7 Ultimate x64. As all of my computers at home I've connected to my router via wifi (open/wep). And what has happened is that Wireless Connection is Connected but with No Internet access -- my ipconfig says: Autoconfiguration IPv4 Address : 169.254.33.161 Subnet Mask : 255.255.0.0 Default Gatewawy : (empty) After ipconfig /renew I get: An error occurred while renewing interface Wireless Network Connection : unable to contact your DHCP server. Request has timed out. [..] I'm looking for a solution for 2 hours now...

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• Connect server to router with workstation in between?

  - by letseatfood

  I have a server (9 yr old Dell with Ubuntu 10.04 Server Edition) and a workstation (Laptop with Vista) which are both connected to a router. The workstation is able to access the server via web browser for testing my web development projects. Since the server is old and does not have a wireless card, I am wondering if it is possible to connect the server directly to the workstation while maintaining the ability to connect to the server from the workstation. The reason is that the computers are in a separate room from the router and I am trying to limit the amount of wires on the floor, along with trying to avoid buying more hardware (like a wireless card). Thanks and I will be more than happy to clarify!

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• DCHP and Router load testing

  - by John H

  I manage a campground wifi network with an average of 10 - 60 active users. I have encountered issues where the router starts acting flaky (failing to assign DHCP or failing to pass traffic) without any clear warning (low cpu utilization, etc). I upgraded the router a couple times and ended up with a Netgear ProSafe VPN router that seems to be handling the traffic. The interesting thing is that the Netgear has lower specs than the Buffalo router it replaced, indicating the issue is with the DD-WRT firmware. While I'll be pursuing this issue on the dd-wrt forums, I need a way to test routers. My vision is having 1-2 computers connected on the LAN side and 1-2 computers connected on the WAN side. I want the LAN computers to be generating various type of traffic and connections, as well as requesting DCHP addresses. A few notes: The wireless aspect should be a non-issue. Most clients would connect to a wireless bridge and come into the router through a network cable. I had a monitoring server with Nagios running check_dhcp against the router. This server was connected directly by a network cable, eliminating wifi bridges and other devices from the equation. This question is somewhat related, but not exactly: Load testing wireless LANs I am going to look at IxChariot. While I'd ideally like to use a 1 computer on each side running Linux and preferably free software, I can entertain running Windows, multiple computers, or non-free software. Total bandwidth doesn't seem to be the issue. I can transfer large files all day. Even on the busiest days, the users seemed to only pull ~5Mbps. There is very little "LAN to LAN traffic" and most of it might never have reached the main router. The issue I need to test for seems to be tied to active users, or more appropriately, active sessions. I know active users or active clients is a meaningless term from a router standpoint and wouldn't mind having more appropriate terms to use. Summary: I need a way to test a routers ability in handling traffic from a large number of clients. My current strategy is to purchase a router, deploy it, and see how it fails in the live environment.

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• What is the lease irriating printer manufacturer?

  - by aireq

  Currently I have a Lexmark all in one printer/scanner which has some of the worse drivers I've seen for a printer. The installation takes forever. Then once it's installed the printer will only work if I keep the "Lexmark Productivity Studio" running in my system tray. Then later after I've scanned something 99% of the time the "Save to PDF" button doesn't do anything when I click it. It is also a wireless printer, but of course the only way to set any of the wireless settings is during the driver setup. So if my WEP key changes then I have to go off and reinstall the entire printer driver. Lately I tried refilling one of the ink cartridges with a key I bought off amazon, and now both the printer and the drivers keep complaining about being out of "Official Lexmark Ink" This comic from The Oatmeal pretty much sums up my feelings about consumer printers and their drivers. This question is, of course, pretty subjective but I'd like to know what (if any) consumer printer brands actual provide quality drivers and software with their printers.

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• Samsung i780 networking problem

  - by Infinity

  Hello guys! Maybe this is not the right place to ask this, but I give a try for it. Please don't rate it down, just ignore it if you don't like. So I have a Samsung i780 mobile phone and I would like to use the internet through my wireless router. I have connected to it. I got an IP address. My laptop is also connected to the same wireless network and I can ping the mobile phone and I get answer. When I open the internet explorer and enter an address it says that it cannot connect to the internet. I have googled very much, but can't find the problem. What do you think, what is the solution?

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• Notepad/Edit equivalent for Linux command line

  - by Jason Kester

  I'm looking for a simple text editor that I can use from the command line in Linux to edit files. I'm used to editing files in windows, so I'm looking for something with the same keyboard interface. That means: SHIFT+Arrow Keys/PGUP/PGDN to select text CTRL+C, CTRL+X, CTRL+V to copy/cut/paste And that's pretty much it. Surprisingly I'm having a tough time finding something like this. Vi/emacs are naturally out. Nano comes close, but has its own non-standard cut/paste/select keyboard shortcuts. Surely this thing exists somewhere. Thanks in advance for pointing me in the right direction.

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• Is there no such thing as a Gigabit switch?

  - by Torben Gundtofte-Bruun

  According to the manufacturer specification, even my rather plain desktop computer has "Gigabit Ethernet". So when I want to copy large files over the LAN (not Internet) it would make sense to have a gigabit switch. I'm searching eBay for a gigabit switch for a planned home network upgrade. The products I find are all labeled "gigabit" but they all have 24 x 10/100Mbit autosensing ports and sometimes 2 x 10/100/1000Mbit autosensing ports. It was my understanding that 10/100 is ancient and that modern computers have network interfaces that work with 1000Mbit, so it would make sense to get a switch that has 24 x 1000Mbit ports. Did I misunderstand, or are sellers (deliberately?) mislabeling older hardware? (Let's not dive into wired vs. wireless networks and how "N" wireless is fast. You'd be right, but not answering the question.)

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• 'DNS server isn't responding' error in windows 7 home premium

  - by pradeeptp

  Hi All, I bought a brand new Dell Studio 1558 just last week. It has windows 7 home premium 64-bit installed on it. My friend who is occupying the adjacent room has a laptop with windows XP. Both of us are connecting to the same wireless router of the hotel. My friend is able to connect to the wireless network without any trouble, but when I try to connect, I get the error "DNS service isn't responding". I get this error when I run the troubleshooting option. I met two more people in the same hotel with win XP laptop and they too dont have any problem. I have gone to possibly all the forums and website but I haven't been able to fix this error :(. I have done all the basic troubleshooting but I have no luck yet. Pls help. Following is one forum where the problem seem to have been trouble shooted but not for all. http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/eeb84518-903d-46d1-9398-80cf211878d7

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• SCCM SP2 - OOB Management Certificates Problems

  - by Achinoam

  Hi experts, I have a vPro client computer with AMT 4.0. It was importeed successfully via the Import OOB Computers wizard, and after sending a "Hello- packet" it became provisioned. (The SCCM GUI displays AMT Status: Provisioned). But when I try to perform power operations on this machine, they always fail with the following lines in the log: AMT Operation Worker: Wakes up to process instruction files 7/29/2009 10:59:29 AM 2176 (0x0880) AMT Operation Worker: Wait 20 seconds... 7/29/2009 10:59:29 AM 2176 (0x0880) Auto-worker Thread Pool: Work thread 3884 started 7/29/2009 10:59:29 AM 3884 (0x0F2C) session params : https:/ / amt4.domaindemo.com:16993 , 11001 7/29/2009 10:59:29 AM 3884 (0x0F2C) ERROR: Invoke(invoke) failed: 80020009argNum = 0 7/29/2009 10:59:31 AM 3884 (0x0F2C) Description: A security error occurred 7/29/2009 10:59:31 AM 3884 (0x0F2C) Error: Failed to Invoke CIM_BootConfigSetting::ChangeBootOrder_INPUT action. 7/29/2009 10:59:31 AM 3884 (0x0F2C) AMT Operation Worker: AMT machine amt4.domaindemo.com can't be waken up. Error code: 0x80072F8F 7/29/2009 10:59:31 AM 3884 (0x0F2C) Auto-worker Thread Pool: Warning, Failed to run task this time. Will retry(1) it 7/29/2009 10:59:31 AM 3884 (0x0F2C) After investigation, I've seen that the problem occurs already on the 2nd stage of the provisioning: Start 2nd stage provision on AMT device amt4.domaindemo.com. 8/2/2009 4:55:12 PM 2944 (0x0B80) session params : https: / / amt4.domaindemo.com:16993 , 11001 8/2/2009 4:55:12 PM 2944 (0x0B80) Delete existing ACLs... 8/2/2009 4:55:12 PM 2944 (0x0B80) ERROR: Invoke(invoke) failed: 80020009argNum = 0 8/2/2009 4:55:14 PM 2944 (0x0B80) Description: A security error occurred 8/2/2009 4:55:14 PM 2944 (0x0B80) Error: Cannot Enumerate User Acl Entries. 8/2/2009 4:55:14 PM 2944 (0x0B80) Error: CSMSAMTProvTask::StartProvision Fail to call AMTWSManUtilities::DeleteACLs 8/2/2009 4:55:14 PM 2944 (0x0B80) Error: Can not finish WSMAN call with target device. 1. Check if there is a winhttp proxy to block connection. 2. Service point is trying to establish connection with wireless IP address of AMT firmware but wireless management has NOT enabled yet. AMT firmware doesn't support provision through wireless connection. 3. For greater than 3.x AMT, there is a known issue in AMT firmware that WSMAN will fail with FQDN longer than 44 bytes. (MachineId = 17) 8/2/2009 4:55:14 PM 2944 (0x0B80) STATMSG: ID=7208 SEV=E LEV=M SOURCE="SMS Server" COMP="SMS_AMT_OPERATION_MANAGER" SYS=JE-DEV-MS0 SITE=JR1 PID=1756 TID=2944 GMTDATE=Sun Aug 02 14:55:14.281 2009 ISTR0="amt4.domaindemo.com" ISTR1="amt4.domaindemo.com" ISTR2="" ISTR3="" ISTR4="" ISTR5="" ISTR6="" ISTR7="" ISTR8="" ISTR9="" NUMATTRS=0 8/2/2009 4:55:14 PM 2944 (0x0B80) This error is consistent with all the other 2nd stage provisioning tasks. (Add ACLs, Enable Web UI, etc.) I've opened the certification authority, and I see that the certificates were issued to the SCCM Site server instead of the AMT client! What could be the reason for this failure? What is the problematic definition for the certificate? Thank you in advance!!!

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• Router loses connection to internet randomly

  - by tvanover

  I have a Belkin wireless G plus Mimo router and it randomly loses the connection to the internet. It seems to happen for a second or two, not enough to impact day to day browsing. But enough to disconnect games, or stall videos I am watching. It happens whether I am plugged into the router or connecting via wifi. I am unsure if it is my router or Comcast that is causing this issue. If I connect a computer directly to the modem the problem never occurs, so that tells me it is probably the router. But I also had a Netgear wireless router WGR614, and it had the same problem. I don't know where to start looking for the source of the problem. What logs should I be combing through? All my machines are win 7 of varying versions.

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• CentOS Live CD Creation issues

  - by Dheeraj

  I am creating my customized CentOS 6.3 Live CD. I am following information given at https://projects.centos.org/trac/livecd/wiki/GetToolset My "livecd-creator" command completes successfully and an ISO image is created. But when I try to boot up my system with this ISO, it goes up to the CentOS blue screen and then the CAPS lock and Scroll Lock LEDs on the keyboard starts flashing. Then from here after, the system takes no input from keyboard and I have to power cycle it and it does the same thing. Could you get me any suggestion why this is causing and possible workaround. Thanks.

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• MacPro will freeze after first startup and first time screen saver activates

  - by Rob Segal

  I've run into a bizarre situation every time my MacPro first starts up in the morning when I get to work and the screen saver activates for the first time. When I try to deactivate the screen saver hitting the keyboard or mouse nothing will happen. At best I will get one of the following... Able to move the mouse but clicking does nothing Login prompt will show up but typing on the keyboard does nothing At worst the screen will be fully locked. In all cases I will have to reboot my machine to get it to work again. After this initial restart the machine is fine for the rest of the day. Anyone encountered something like this before?

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• How to create a separated network to customers only?

  - by Valter Henrique

  I work in a company where we have a network ethernet and wi-fi, we would like to create a network where our customers could access our network but don't have access to our computer network. This access would be internet only, nothing more. The customers will not see our computers and the files that we share in our network. I have two routers, how can I do this ? A Cisco Linksys Wireless-N Broadband Router WRT160N V3 and a Netgear Wireless G Router WGR614 v9 and about firewalls there´s only windows firewalls in each computer by default.

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• network user isolation

  - by seaquest

  My question is for a network with a Linux iptables router gateway. How can it be possible to prevent inter-network traffic of those users. Think this case as a public network, IPs are distributed through linux gw and users are authenticated thru the gateway. We want to protect public users from public users. Network is not wireless and I can not use Wireless AP user isolation. Actually I have a simple method. Subnet the network into /30 mask. Give minimum IP of each subnet to the gateay and ditribute those /30 IPs from the subnet. But this is pretty costly for such an aim. I want to ask for other methods Thanks.

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• LAN cable not connected, but it is

  - by Koen

  I have a Windows XP SP2 desktop PC. It connects to the internet with a LAN cable (there's a wireless router for my laptop in between). The problem should be software because: when i tried connecting the same LAN cable to my laptop it works when i plugin the LAN cable (onboard) the green light is on and the orange light flickers when i tried the other cable (that feeds the wireless router) i have the same problem it worked a few days ago, nothing specific changed I tried removing the ethernet card from the device manager, and windows automatically reinstalled it. What could cause this? What can I try?

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• IP Connflict on network

  - by PSU_Kardi

  I keep getting an IP conflict on my home network and can't figure out why. I'm running a Belkin-N wireless router that has an Ethernet connection to my 360 and a wireless connection running to my laptop. It's WPA2 encryption and I have a nice password on my router consisting of letters , numbers and special characters. But for some reason I keep getting IP conflicts at night time...By the time I look into the problem I don't see anyone else on the network. Is my router giving me false positives?

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• Microsoft Ergonomic Keyboards With Card Readers?

  - by Steve

  When I started working at my current job I developed tendinitis in my wrists. Luckily that cleared up when I started using a Microsoft ergonomic keyboard. The problem is that where I work is moving to more security. We will need to stick a card into a slot to log into our PCs. They bought a bunch of new keyboards with these slots built in. All regular keyboards. Is there something like the Microsoft Ergonomic keyboard that comes with such a card slot? Thanks.

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• Why Standards Place Limits on Data Transfer Rates?

  - by Mehrdad

  This is a rather general question about hardware and standards in general: Why do they place limits on data transfer rates, and disallow manufacturers from exceeding those rates? (E.g. 100 Mbit/s for Wireless G, 150 Mbit/s for Wireless N, ...) Why not allow for some sort of handshake protocol, whereby the devices being connected agree upon the maximum throughput that they each support, and use that value instead? Why does there have to be a hard-coded limit, which would require a new standard for every single improvement to a data rate?

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• Setup IIS 7 as FTP Server that is connectable outside of my local network

  - by Usta

  I was able to setup an FTP site that I was able to access via ftp://127.0.0.1/ or my local(static) ip. To do this I followed these instructions (with the exception that I did not bind to 127.0.0.1 as suggested) http://learn.iis.net/page.aspx/301/creating-a-new-ftp-site-in-iis-7/ I have created a firewall exception for port 20 and 21, and setup port-forwarding on my wireless router. But I can only access the site via local-host, and I need to have a friend have read access to it. So how do I enable remote access to it? (I'd rather not purchase a domain-name) My setup: IIS 7.5 Windows 7 Professional Wireless Network Norton Internet Security 2012 An Internal Static IP Address

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• Win 7: Share internet connection via Ethernet and WiFi

  - by Anvaka

  I have the following configuration: Box 1. Running Win 7, connected to the Internet via Eth0. Has one wireless network adapter and one another ethernet adapter (say, Eth1). Box 2. Running Win XP, has one ethernet adapter. I'd like to share Internet connection of the Box 1 with Box 2 via cable and have box 1 also sharing the Internet with other wireless devices. I don't want to buy any additional hardware. Is it possible? PS: Sorry if I'm unclear. I merely know nothing about NAT and network administration.

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