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• How to calculate bandwidth limits per user on WiFi network

  - by Lars

  A typical 802.11g access point can provide around 25 Mbps of bandwidth. How is the bandwidth shared among the users? Furthermore, how many users can be served by a single access point using 802.11g in an environment with low interference, and average web activity from the users? The goal is to use bandwidth limitation to avoid starvation for some users in case some of the users start to download a file or stream HD video or some other bandwidth intensive activity. Can someone break down the math on this?

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• What would happen if I did a "Boot to VHD" to a VHD that was configured to run under Hyper-V?

  - by tbone

  Microsoft has a Hyper-V based VM I'm interested in running, however, I don't have access to a Windows Server 2008 machine to try it on, only a Windows 7 Pro x64 machine (Windows 7 does not support Hyper-V). This is the VM in question: This download contains three Windows Server 2008 R2 SP1 Hyper-V Virtual Machine set for evaluating and demonstrating Office 2010, SharePoint 2010 and Project Server 2010. 2010 Information Worker Demonstration and Evaluation Virtual Machine (SP1) http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=27417 I came across a somewhat relevant article from Scott Hanselman: Less Virtual, More Machine - Windows 7 and the magic of Boot to VHD: http://www.hanselman.com/blog/LessVirtualMoreMachineWindows7AndTheMagicOfBootToVHD.aspx I realize other options are to convert this VM to a VMWare compatible VM or some of the options to run it under VirtualBox. But instead of those routes, I'm wondering: What would happen if I tried to go the "Boot to VHD" route using this Hyper-V VHD? Is it possible that during the boot process, Windows would simply notice that hardware had changed and adjust accordingly, installing the appropriate drivers and continuing on without a hitch?

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• Multiple VLANs on a single subnet

  - by mstaessen

  I would like to establish the setup shown below. The image is taken from (http://gcharriere.com/blog/?p=620) and explains how to set this up on a brocade device. I would like to use an ubuntu server to do the routing. Right now, the switch and the server/router are connected with a trunk and the server uses the vlan package, kernel module and (inner) subnets for routing. I would like that: no IP addresses get lost in the subnetting (outer subnet is /26, inner subnets are /28) I don't want the rigorous subdivision of my outer subnet. I want to assign a VLAN to any IP in the outer subnet. How do I need to configure my interfaces? What is the "ubuntu" translation of "ip follow ve"? Thanks!

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• Should I limit end-user gigabit ports to avoid saturating uplink/trunk connections?

  - by Joel Coel

  We have a campus with 16 buildings and older 850nm 1Gbps fiber links between the buildings, that all come to a core switch for our servers that also uses 1Gbps ports. We're finally starting to replace our aging 10/100 end-user switches, and much of what we're looking at are 1 Gbps units. My question is, since the trunk/uplink lines are still 1Gbps, if I were to install 1 Gbps switches for end users, should I limit the ports to 100Mbps until I can also upgrade the trunks to avoid allowing a bad-behaving host to saturate a trunk line (since we're a college, we have plenty of mis-behaving hosts) and thereby create a DoS situation for a building, or will TCP congestion control typically take care of that for me? What if we have a lot of UDP traffic (games, video chats, even a small amount of bittorrent)?

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• Re-downloading accidentally deleted podcasts in iTunes

  - by Matt

  I deleted some previously deleted podcast episodes in iTunes 9 and I'd like to re-download them. (I don't want to manually re-download them because then they won't show up in the podcast's list in the iTunes Podcast section.) I've read http://blog.krisgielen.be/archives/54 as well as Way to get old podcasts in iTunes where the suggestion is to delete the iTunes entries for the podcasts I'd like to recover, then hold shift while re-opening that podcast's little triangle icon. Here's the problem though: holding shift and re-opening the triangle tells iTunes to refresh the RSS feed, and it's possible that the RSS feed no longer contains the item you want. What I'm really looking for is a means of getting the "Get" button (that normally appears on un-downloaded podcasts) to reappear on the episodes I've previously downloaded but deleted.

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• OS X 10.8.3 + attempt to change VPN settings = no more VPN access

  - by nicole

  I am running Mountain Lion and had gotten very tired of re-entering my password at random times when using my school's VPN network (I don't know much about these, but the type is Cisco IPSec according to the setup instructions I followed a while back). In an attempt to make life easier, I followed the instructions here, but, alas, any attempt to connect with VPN was met with the message "A configuration error has occurred. Verify your settings and try connecting again" (or something along those lines.) I then tried to do the steps in the blog post in reverse and change everything back. Upon (supposedly) doing that, though, a new error message came when attempting to connect to VPN: "The negotiation with the VPN server failed. Verify the server address and try reconnecting." Now I have no idea what to do. Is there a way to reset all VPN-related things in my system so that I can follow my school's instructions and just start over?

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• Is there any Mac Pro hardware parts that can ONLY be purchased thru Apple?

  - by bigp

  I'd like to know if I need to be concerned about any hardware parts that I should include in a brand new Mac Pro purchase, instead of trying to hunt it down on 3rd party vendors (or whitelist vendors / hardware suppliers). The main components I'm interested for "upgradeability" are: Processors (If starting with Two 2.4GHz Quad-Core "Westmere"); RAM (If starting with the least possible, which seems to be 6 x 1GB); Video Cards (If starting with one ATI Radeon HD 5770, can a 2nd one be purchased elsewhere?) Hard-Drives (Since these are mounted in specialized trays [if I'm not mistaking], are they also sold elsewhere? And can they be bought as SSDs?) Power Supply (Do I need to be concerned about this at all, or does it auto-adjust depending on the new component upgrades?) I just want to be sure by choosing a Mac Pro with lower component specifications that I can in fact purchase upgrade parts cheaper elsewhere. Thanks!

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• Motherboard memory question

  - by JERiv

  I am currently drawing up specs on a new workstation for my office. I am considering the Asus P6X58D for a motherboard. This board's specs list it as supporting 24 gigs of memory. Suppose I were to use six four gig memory cards and then two video cards with 1 gig of memory apiece. Is the maximum supported memory similar to how 32 bit operating systems only have enough address space for 4 gigs of memory? Simply: Will the board post? If so, will the system be able to address all the memory, both the 24 gigs on the ddr3 bus and the 3 gigs on the graphics card?

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• Server reboots every 4.5-5.5 minutes...

  - by Andy

  Hi, I've recently installed a server in colocation, and my server is rebooting every 4.5-5.5 minutes. Regardless of the OS I run, it reboots. I have all ECC memory in the server, so it should correct errors if there is a bad bit in the memory, right? It's weird because it always happens about 4.5-5.5 minutes after bootup. My motherboard is a Supermicro X8DTL-iF. I read on a blog that another person had the problem, and supermicro recommended to do a BIOS update. Is this the right course of action?

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• Remote desktop connection drops before login can appear

  - by Keatly

  Hi Everyone, Someone asked this question a few months ago and I have the exact same problem. I have tried all of the suggested solutions in the other posting (in particular reinstalling the video card on the server), but have not had any luck. I have gone through this troubleshooting guide in detail with no results: http://theillustratednetwork.mvps.org/RemoteDesktop/RemoteDesktopSetupandTroubleshooting.html I have a client with Remote Desktop enabled that I can't connect to in our local network. When I enter in the machine ip/port in the connect box and hit Connect, it briefly gives the normal "Connecting..." dialog box. However, after 2 seconds it just drops. No error message, nothing. Just disappears as if nothing was happening. •Windows XP SP3 •Windows firewall is open for 3389TCP •Machine is on a domain •RDP is enabled in My Computer •User is a local admin I have loads of other machines on the same domain with the same GPO that work fine. Any ideas?

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• Screen is black at login screen if display driver is enabled

  - by Amir Rachum

  I have a Lenovo x200 and recently its screen didn't work, so I took it to a repair lab. The guy told me they replaced the screen inverter. I powered up the laptop and the ThinkPad logo was shown, so I was happy. When I got home the computer would boot up, then instead of the logon screen, I got a black screen. Went to safe mode, disabled the display adapters, reset the computer, and I got a clean boot. Then I tried to reinstall the drivers, and it just led to the same condition. My video card is (from device manager): Mobile Intel(R) 4 Series Express Chipset Family. Now my laptop works as I'm working with display drivers disabled, but without display drivers I can't watch movies, etc. Any solution to this problem? Edit: I plugged in an external monitor and it works on it with display drivers enabled. However, it does not find the laptop monitor.

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• Identifying the version of ATI Catalyst drivers

  - by Snark

  I have bought a new video card based on the ATI Radeon HD 5670 chipset. I couldn't make it work with the latest ATI Catalyst drivers found on their website, only the drivers found on the CD delivered with the card worked. How can I know the version of Catalyst that is installed on my PC (running Windows 7 64-bits)? The ATI Catalyst Control Center returns the following information: Driver Packaging Version 8.673-091110a-092263C Provider ATI Technologies Inc. 2D Driver Version 8.01.01.973 2D Driver File Path /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS/{4D36E968-E325-11CE-BFC1-08002BE10318}/0000 Direct3D Version 8.14.10.0708 OpenGL Version 6.14.10.9120 Catalyst™ Control Center Version 2009.1110.2225.40230 I do not recognize anything pointing to a "marketing version". The website says the current version of Catalyst is 10.2.

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• Nginx Cache-Control

  - by optixx

  Iam serving my static content with ngnix. location /static { alias /opt/static/blog/; access_log off; etags on; etag_hash on; etag_hash_method md5; expires 1d; add_header Pragma "public"; add_header Cache-Control "public, must-revalidate, proxy-revalidate"; } The resulting header looks like this: Cache-Control:public, must-revalidate, proxy-revalidate Cache-Control:max-age=86400 Connection:close Content-Encoding:gzip Content-Type:application/x-javascript; charset=utf-8 Date:Tue, 11 Sep 2012 08:39:05 GMT Etag:e2266fb151337fc1996218fafcf3bcee Expires:Wed, 12 Sep 2012 08:39:05 GMT Last-Modified:Tue, 11 Sep 2012 06:22:41 GMT Pragma:public Server:nginx/1.2.2 Transfer-Encoding:chunked Vary:Accept-Encoding Why is nginx sending 2 Cache-Control entries, could this be a problem for the clients?

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• Volume randomly turning itself down on Windows 7 64-bit

  - by Arda Xi

  This is the weirdest issue I've ever encountered with my PC. Every so often, my sound will start playing back at a lower volume. This happens when watching video, listening to music, all independently. It usually lasts anywhere up to a minute, after which it will turn up again. The weird thing about it is that the volume control in Windows remains at 100%, even though the volume is audibly a lot lower. (No, I'm not going deaf, it's just my PC. I checked.) I just have no idea where to go to troubleshoot this, even. I'm using Windows 7 64-bit with an on-board Realtek sound-card. Oh, just in case someone finds this question on Google or whatever, making sure this is on Do Nothing may fix your problem. Unfortunately, it did not work for me. My settings all seem fine. This is my audio slider. (Took the screenshot while the issue showed.)

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• Recommend a Software for documenting work/research

  - by Rogue

  Need a software for documenting my work & research. I was considering to use blog engine but then I don't want to be playing around with backing up the databases and the matter separately. The specifications for the software would be: 1) To catalogue work by categories, tags and date. 2) Easy editing and drawing features 3) Easily incorporate saved html files into matter I'm writing, with the formatting and pictures. (probably use the mht format, don't want to be wasting timeformatting html pages) Would like the html pages to be directly displayed in the software and not opened on demand Software should be for Windows. Any recommendations? 4) Language tools could be an addition but only an optional feature

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• Thermal risks to other components when watercooling CPU

  - by B Sharp

  I recently ordered all the components for a new desktop system to replace my old, dying computer. I wanted to have a really quiet desktop, so I got a case rated for being quiet and opted to try a closed-system CPU water cooling kit (Antec Kuhler H2O 620) that was on sale for a very good price over the Thanksgiving weekend. Most of my components are still in transit, but I became somewhat worried when a friend mentioned that abandoning air cooling units can result in heat buildup inside the case due to heat generated by the video card and other components such as RAM, the northbridge, MOSFETs and voltage regulators radiating heat that the CPU fan would normally at least keep circulating around so it doesn't build up in localized areas. Is this a realistic problem? What other precautions should I take to remove heat from other components? Adding more case fans seems like it would get really noisy. Are there quiet alternatives?

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• Client can't reach my production webserver. It's their ISP's fault, but now what?

  - by MikeN

  I have a customer in Michigan who can't access my production SaaS webserver that is hosted on Slicehost. All other companies across the US/Canada/Europe have no problem reaching the site. This problem is occuring intermittantly, and Slicehost customer service says it's a problem with the client's ISP. I got the IP address of my client, and ping'ing that IP address from my PROD server fails, but ping'ing the IP address from my dev box or our seperate blog server (also hosted on slicehost) works. How do I debug a problem like this? I asked the client to reach out to their local ISP and ask about this problem. A traceroute shows that the packets are getting stopped on a Comcast Michigan node which is the client's ISP. Is there anything I can do additionally to fix this problem for my client?

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• In an Excel calendar, how can I create a calendar event for a date based on an entry for another date?

  - by James

  Sounds a bit confusing, doesn't it? I've created an 'events calendar' in Excel for my local area. Each date throughout the year is assigned to a row. What I want to do is, when I enter an event for a particular date, then automatically create an entry elsewhere in the calendar for an action to be taken. So for example, There's an event on the 30th July, so I enter it into the calendar. I'd like to be able to specify that an entry should be made 4 weeks earlier, on the 2nd July, to tell me to blog, tweet or whatever about that particular event. Can Excel help me to do that and if so, what do I need to do?

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• Power supply issue? New Radeon5850's fan runs at full speed and PC doesn't boot.

  - by Kris

  I recently bought a new ASUS EAH5850 graphics board. I installed it a custom PC which had an ASUS p5n-e SLI mobo along with a 500w Thermaltake W0093RU power supply. Sometimes when doing a cold boot the 5850's fan will run at full speed and the PC will not boot. Powering off by holding down the power button and powering back on sometimes remedies the situation and everything boots normally. Warm reboots also never seem to have problems. For some reason though cold boots almost always do. Another issue I notice is that when the PC does boot normally it takes longer (+30 secs) to POST than with my last video card. I flashed the mobo with the latest available BIOS but it had no effect. Is my problem a power issue or incompatible motherboard or something else I'm missing?

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• How to debug high memory usage by registry?

  - by bkr

  I have a windows 2008 r2 server running ADFS2 and some web apps that is having issues with low memory. Digging around I found that the 5.5 GB were being used under Kernel Memory (paged). Further digging with Poolmon, I discovered that the majority of that (5GB+) was being used by CM - configuration manager. Also known as the registry. I'm really now sure how to tell why the registry is using so much memory however, or how to release it? Looking at the physical registry files they don't appear that large. EDIT #1 Using the powershell script @ http://jdhitsolutions.com/blog/2011/05/get-registry-size-and-age/ confirms what I saw looking at the physical registry files, that they're relatively small Computername : (removed) Status : OK CurrentSize : 67 MaximumSize : 2048 FreeSize : 1981 PercentFree : 96.728515625 Created : 4/1/2011 11:38:02 AM Age : 454.23:41:28.2540682

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• Where to find Linux drivers for my notebook

  - by smwikipedia

  Perhaps it is not proper to post on this forum. Sorry for any inconvenience. I have finally make up my mind to use Linux (Ubuntu 10.04) as the SOLE operating system on my notebook. The last obstacle is that where to find proper drivers for my devices? Such as: ATI Xpress 200M Video Adapter Texas Instrument SD Card Reader And many more... Could someone give me some advices on where to find these drivers? Many thanks.

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• Looking for Kiosk-style / camera store easy photo memory card to CD/DVD burning program for Windows-7 Notebook? For non techie user.

  - by Rob

  I'm looking for a Kiosk-style / camera shop easy photo memory card to CD/DVD burning program? For non technie user. The kind of system you see in a camera shop / store, e.g. in the UK, Jessops and Boots stores. This is for my Dad who is adept at general PC usage as a notebook owner, but would prefer something fairly simple. The task of burning photos to CD/DVD, in their original photo file .jpg form, i.e. NOT as CD or DVD video or slideshow, is what I'm looking for. I'm guessing this might be possible in Picasa, but all the options available might be superfluous and confusing. He could probably learn to use that but thought I would try simpler options first. Looking for something that guides the user through the steps/stages of the process, 'Wizard' style. Any suggestions? Platform: HP Windows 7 Home notebook with CD/DVD burner and SD memory card slot.

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• Mountain Lion screen crashes after returning from sleep

  - by Aron Rotteveel

  During the past 3 days I have experienced the following issue: when returning from sleep, I see an extremely garbled version of my desktop. The only thing that seems to help is a reboot. My first guess is that this is related to the video card. After looking into this issue, I found a lot of problems related to ML and returning from sleep, such as this post on AskDifferent, but I think this is a different issue because it does not speak of a garbled screen. Some more details: System: MacBook Pro 15" early 2011, 2,2GHZ I7, 8GB Ram, AMD Radeon HD6750M 1024 The issue seems to happen only when I open my laptop in the morning; if I close and open my laptop during the day, it does not seem to happen. The issue 'solves' when rebooting. Photo of how this looks: Update November 27th 2012: I re-installed my laptop a couple of weeks ago, which seemed to have solved the problem, but sadly, it still persists.

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• How to Find Out What Version of Display Driver is Installed

  - by Artium

  One of my favorite games, "Wolfenstein Enemy Territory", has stopped working lately. It throws a segfault during the initialization phase. I suspect that the reason is a recent update to the video card driver. The problem started after I updated Ubuntu but I do not remember if there was a driver update in the list. My question is how can I check this. How can I view the current version of the display driver installed and the date it was last updated? If I discover that this is indeed the problem, will it be possible to revert the update and stay with the previous version of the driver?

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• How do I publish a Power Point Presentation that is High Quality and no lag on the Web?

  - by Luke Hutton

  I have a ~22MB Power Point Presentation (2007) that I need to be presented on a website for viewing. The file contains audio over several slides and some embedded images. What is the best practices or best way to present the presentation so it gets delivered the quickest and best quality to users? Some ideas I've thought of are: Somehow compress the file (.wav audio files, images) into a smaller presentation and save it as a Power Point Show (pps) so users can download it and use the free Power Point viewer? Convert it to video format (.avi) or something and stream it off the web? (Hopefully freeware) Save it as a web page? (but then it's only viewable in IE I believe)

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