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• Calculating Utilization in a Stop-And-Wait Protocol

  - by AlanTuring

  So theres this question in my book and it doesn't state exactly how to go about actually calculating utilization anywhere, and i'm not being able to find any substantial information regarding everything i need to solve this question.(My mid term is next week). Anyway, here's the question: The distance from earth to a distant planet is approximately 9 × 10^10 m. What is the channel utilization if a stop-and-wait protocol is used for frame transmission on a 64 Mbps point-to-point link? Assume that the frame size is 32 KB and the speed of light is 3 × 10^8 m/s. Suppose a sliding window protocol is used instead. For what send window size will the link utilization be 100%? You may ignore the protocol processing times at the sender and the receiver. thanks to anyone who has any idea.

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• Can I upgrade to the new Ubuntu 10 from Ubuntu 9.10 without formatting my computer?

  - by Tom Brito

  I'm using Ubuntu 9.10

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• Direct URL to a Google docs revision

  - by user12889

  I have a Google doc document. Using Edit-File-See Revision History I can see older revisions and go to them. I want to give some-one a URL which points directly to a specific revision of my document which is not the current one. How do I do this? (Note: The link from the revision list does not work outside that list, if you enter it in the address bar you just get the list, not the document; the URL in the address bar when you load the older revision does not work either)

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• Focus issues in OSX Spaces

  - by AK

  Spaces rarely returns focus to my last used window. Haven't been able to peg universally reproducible steps, but spend any time switching among spaces and windows and you'll come across this. It often happens with finder windows. I'm thinking this is because osx treats Finder as a single app, so bringing finder forward in one space brings it forward in all spaces. Extremely annoying! Anyone have a fix for this?

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• Can I run a mix of static addressing and NAT?

  - by aroth

  Let's say that an ISP offers a plan with 5 static IP addresses, but I have more than 5 devices, many of which (such as a networked printer, for instance) I do not want or need to have a static IP address. So the topography I'm planning goes something like: ISP -> Router -> Switch -> Computer (static address) -> Computer (static address) -> Printer (DHCP/NAT) -> Tv (DHCP/NAT) -> (...) -> Wireless Devices (DHCP/NAT) Generally speaking, is it possible to run a network like that? If not, then what sort of setup do I need so that I can assign static addresses just to the things that need them, and use DHCP/NAT for everything else? Also, what internal networking devices will consume a static IP address? I'm pretty sure the router will, correct? Does the switch also?

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• How to pass an IP address to inet_addr?

  - by November

  I can't seem to pass an IP address to inet_addr. I have gone through the debug but I still can't figure out why this won't work. printf("Server IP\nIP:"); scanf("%s",cmdPtr); //Bind socket address.sin_family = AF_INET; address.sin_addr.s_addr = inet_addr(&cmdPtr); address.sin_port = htonl(SERVER_PORT); lenC = sizeof(address); if (connect(sdC, (struct sockaddr *) &address , lenC) < 0) { perror("Could not bind Socket\n"); return -1; }

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• tagging all email addresses from my mac microsoft outlook 2011

  - by N.Sankar

  I have been using Outlook for Mac 2011 for last 2 years. Now I want to list out all the people in my email correspondences (sent and inbox) and send them one email. Where can I find the database of everyone's email address in my Mac? The mail will have to have email addresses one after another like this: [email protected], [email protected] all in the format which is accepted in outlook and which can be emailed immediately. I need to basically tag all my email address to send them one email.

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• How to get rid of InternetCorkboard.com virus (specifically)?

  - by ADSMarko

  The other day I picked up the new version of InternetCorkboard.com virus, the one that doesn't come with any program I've installed (as far as I can tell) and that doesn't show among Firefox add-ons. I've tried as much as I could google and even installed brand new version of Microsoft Security Essentials. I did the full scan with MSE and it didn't find anything. ATM I'm back at three-years old Firefox, but I wanna kick the bastard out. I got redirected here from Stack Overflow, but I need an answer since everything I could google is worse than useless. So anyone has any idea how to kick InternetCorkboard virus specifically?

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• Please insert a disk into SD/MMC - Vista problem [closed]

  - by Naunidh

  Possible Duplicate: Please insert a disk into SD/MMC - Vista problem Hi I tried pushing my 2GB micro SD card using the inbuilt card reader. On clicking the drive I get "Please insert a disk into SD/MMC". This problem is really frustrating. The card works fine on other computers so does the microSD to SD attachment. I have done following o fix. - Updated Vista and installed SP1. - Updated the TI drivers for FlashDrive. - Checked Vaio site for updates (none required). - Added a new entry HKLM\SYSTEM\ControlS* et001\Services\tifm21\Parameters/SDParam=1 took the hint from (http://tinyurl.com/nk33tp) I have restarted the PC multiple times. As soon as I put the card in, the SD/MMC device icon blips, so it seems the hardware is at least detecting something. The card reader was working fine few days back. I guess some windows update has broken something, does any one have any idea on how to proceed. MY laptop is VGN-N365E.

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• Default browser hangs

  - by Craig Hinrichs

  Intermittent hangs would occur when I would use Internet Explorer to open a new main page or new tab to a site I know would be up. The browser would open and say "Waiting for site example.com" and do nothing more. If I closed the window and reopened it it would immediately connect. Over time I would have to close and reopen the window to get to the page. This would happen to any page, including Google. Got sick of it and started using Chrome. I recently upgraded my anti-virus and am now experiencing the same issue with Chrome. I use AVG for my antivirus. Empirically it seems that if I don't make Chrome my default browser I don't experience the issue. I tested this theory for over two hours yesterday. Possible issues I have found this could be but not confirmed yet: MTU settings are not correct. I am infected but my antivirus has not caught it (unlikely but possible) ?? I would like to think this is related to my antivirus but I am unsure how to verify. I don't like the idea of killing my antivirus if #2 is a possibility. I am looking for tips on how I can troubleshoot possible issues.

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• How to reflect in the database a new belongs_to and has_many relationship in Ruby on Rails

  - by Ken I.

  I am new to rails (usually a python guy) and have just been trying to build a simple task manager application for fun. I am using Devise for authentication and have a single Task object I am trying to relate to a user. I have added the following to the Task model: class Task < ActiveRecord::Base belongs_to :user end and I have added the following in my User model for Devise: class User < ActiveRecord::Base has_many :dreams <<normal Devise stuff>> end Whenever I added this information I then ran: rake db:migrate. It then gave me an error that the database field did not exist for user_id when I tried to do anything with it. I am sure it is something rather simple that I am missing. Thanks for the help.

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• Minidump folder cannot be found

  - by Saxtus

  Although I have enabled the creation of minidump files in my system, it appears that either Windows doesn't create them where the Startup and recovery dialog points to (%SystemRoot%\Minidump) or at least I can't find them. Even the Minidump folder under Windows directory is missing and I had numerous BSODs till now. I've searched all my HDs for mini*.dmp files only to find some old ones in a backup folder from my Vista x86 installation, before I install Windows 7 x64. Any thoughts of why this is happening and how to fix it? Pre-thanx!

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• Microsoft Access 2003 menu bar is missing under toolbar customize

  - by tintincute

  Last time I was trying to hide the menu bars in my existing database. I added code in my module which I found on the internet. But now when I start Access I can't find the menu bars where I can usually see the File, Edit etc. I tried to restore the default, the menu bar can't be found under the customize toolbar. Any idea what happened? This is added from the website: Dim i For i = 1 To CommandBars.Count CommandBars(i).Enabled = False Next i I tried it but it didn't solve the problem. confused:(

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• What is Google Docs' SLA?

  - by Walter White

  Hi all, I am evaluating online storage and for me, that means either Amazon S3 or Google Docs. Amazon very clearly posts there reliability and SLA: http://aws.amazon.com/s3/#protecting Their rates are obviously higher than Google's, but it is really hard to compare without having an SLA. Does anyone know what Google's commitment is for reliability? Is it 99.99% for data, is there anyway to make that more durable? I have to ask too, wouldn't google docs at least be inheritently more reliable than a hard drive? Thanks, Walter

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• Windows XP computer can't see Windows 7 shares

  - by Alex Brault

  I am building a network containing notably a laptop running XP and a computer running Windows 7. Both computer have shared folders and the 7 has a shared printer, to which another laptop running 7 is able to print. If I attempt to see the laptop's network shares on the PC, everything works perfectly: I am able to see and enter the folders. The reverse operation however doesn't work. Xp doesn't see the Windows 7 PC. Other things to note: As mentioned above, another Windows 7 computer is able to see the printer and I can ping both computers from either PC. Both computers are in the same workgroup named ALLAITEMENT Password-protected shares are turned off on the PC. The 7 Computer uses 40/56 bit encryption The Windows XP laptop has SP3

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• run or send a command to a tmux pane in a running tmux session

  - by cjroebuck

  I want to write a shell script which will attach to a named tmux session, select a window (or pane) in that session and run a command in that selected window (or pane). How do I do this from a bash script? I know tmux new-window -n:mywindow 'exec something' allows you to send commands to a freshly created window. But I need something like tmux select-window -t:0 'my command' I suppose I could use send-keys but seems like their should be something that takes a command or list of commands that get run.

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• How to detect VPN disconnection with vpnc?

  - by Abhinav

  What is the easiest way to detect that a vpnc connection on Linux/Ubuntu has disconnected? Manually, I think the way to detect is to check whether the interface (tun0) appears in /sbin/ifconfig output. Is there a better way to find out immediately, so that a script can be run to restart the connection?

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• DHCP not responding from laptop or router, but works on directly plugged PC?

  - by Matt H

  I'm at my sister in law's place in Singapore. I'm not from Singapore but am here for a few months. She has some sort of cable modem made by motorolla (SB5101 Surfboard). I think it goes, through starhub or similar provider. Anyhow, her PC is directly attached by cable (not wireless) and she can access the internet. There is no wireless router connected to it. The PC is configured with DHCP and appears to be working. However, the moment I unplug her PC and plug in my laptop, it doesn't get an address. The interesting thing here is that I also see this toredo tunnel adaptor etc. I'm not familiar with what that is. It appears to be being assigned an IP v6 address and an IP v4 address. I thought perhaps it's my laptop, but also when I plug in my DDWRT based router, it also fails to get a DHCP assigned address on the WAN port. I can't also seem to connect into any web configuration on the motorolla modem either. Any ideas? what kind of setup is this? all I'd like to do is plug in my wireless router so I can roam around the house and also access the internet.

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• Ubuntu 11.10 Virtual-box Unity 3D not working

  - by naveen

  After struggling for four hours, I still cannot get Unity 3D of Gnome 3 to work on my VirtualBox - I have been pouring through Internet and forum posts but to no avail. Here's what I've done so far: VirtualBox 4.1.4r74921 on Windows 7 Installed Ubuntu Desktop 11.10 ( 32 bit ) Enabled 3D acceleration Allocated 1.5GB of RAM Allocated 50MB video memory (hope this is not the culprit) Installed Guest edition 4.1.4 Did apt-get update and apt-get upgrade Booted back in to Ubuntu - falls back to Unity 2D Shared folder, mouse integration all works, so guest edition is properly installed Tried the command and below is the output /usr/lib/nux/unity_support_test –p OpenGL vendor string: Mesa Project OpenGL renderer string: Software Rasterizer OpenGL version string: 2.1 Mesa 7.11 Not software rendered: no Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: no GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: no I am trying to find what the "no" means but cannot find any good answers. Inter Core i5 processor 4GB of RAM on the host Display adapter: NVIDIA GeForce 8400GS Is anyone else facing the same problem? If so, can you point me to a solution or any reference where I can find a solution?

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• The public link of dropbox doesn't work

  - by user828896

  Recently, I find the public link of dropbox such as https://dl.dropboxusercontent.com/u/209352/Temp/Mycss.PNG don't work sometimes. I have to use share dropbox link such as https://www.dropbox.com/s/nr4bb00sd80pgl9/Mycss.PNG It seems that share dropbox link works well. Could tell me what is different between public link and share dropbox link? Can I always use share dropbox link instead of public link ?

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• Windows 7 playback of dvr-Microsoft files stutters

  - by Jim Lynn

  I've just had to install Windows 7 on my Media Center machine because my Vista installation had a faulty drive. I've got the latest drivers that I can find - Intel 945GM integrated Graphics, Realtek audio drivers. Things are working OK with one exception. Playback of old recordings, from dvr-Microsoft format files, is choppy. The picture freezes for a fraction of a second, then quickly catches up. The sound is uninterrupted and doesn't pause. These freezes happen once every 5 seconds or so. It's very regular. Playback of Live TV from the digital tuner is perfectly smooth. DVD playback is perfectly smooth. As an experiment, I used the MPEG editing package VideoReDo to create a small test file in three different formats. This program takes the raw MPEG streams and repackages them into the desired container. I took the same clip and created three files in three formats: dvr-Microsoft (Microsoft's old recorded TV format); mpg (standard MPEG); and ts (raw MPEG transport stream of the kind often produced by PVRs). When these three files are played back under Windows 7, the mpg and ts files play smoothly, but the dvr-Microsoft file stutters. The last piece of data I have is that two other Windows 7 machines can play back dvr-Microsoft files smoothly with no stuttering. One is a netbook, with less grunt than the media centre. So there must be something specific about my Media Center machine that's causing the problem. Does anyone have any idea where I can look now? I don't know much about AV software, codecs, filter graphs etc. but I suspect that's where the problem lies. Rendering the video isn't the problem, but extracting the streams is. How would I go about diagnosing the problem? Edited to add: I just used the GraphStudio tool to look at the filter graph on the offending PC. The filter graph it uses by default for dvr-Microsoft looks identical to the other machines, and, interestingly, when I play the files using GraphStudio they run smoothly. Under Windows Media Player and Windows Media Center they stutter. I'd like to see the filter graph for Windows Media Player but GraphStudio won't show it. It looks like Windows Media Player and WMC are using a different decoding path to GraphStudio. Edited again to add: Today I purchased a new HDTV. The same Media Center driving the TV at 1080p is now playing back the old Recorded TV files smoothly, without stuttering. So whatever the cause of the original problem, using a different resolution seems to have removed the problem. It might also explain why nobody else has had this problem. I doubt many people use Media Centre with a 14in portable TV.

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• Does VPN connection on virtual machine bypass host VPN?

  - by Daniel Valland Torgrimsen

  I wanted to see if i could channel my traffic trough two vpns, so as an experiment i set up a windows xp virtual machine in virtualbox (using NAT shared network setting), connected the host pc(windows 7) to a vpn, and then the virtual machine to another vpn. this seams to work fine. However, my question is, is the traffic sent trough both vpn servers, or is the virtual machines vpn bypassing the host machines vpn connection? thanks.

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• Flashing the BIOS - what is it?

  - by studiohack23

  What does "Flashing the BIOS" mean? Are there benefits to flashing it? Is safe? Should it be done inside or outside of an OS, say my current Win7 installation? Thanks!

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• Components needed for VPN

  - by Anriëtte Combrink

  Hi there We eventually got our Mac Mini Server. We now want to set up a small Remote Access VPN using this Mac Mini Server. Firstly we are not sure of the components needed additionally to the server to setup this VPN. We currently have the following: 1 Mac Mini Server 1 Firewall Router (Billion 802.11g ADSL2+ router with VPN capabilities [it says so on the box]) 4Mbps ADSL connection (which should have VPN capability enabled by the service provider, or so we heard) We are not sure what else needs to be included to enable our small VPN. Any advice would be really helpful.

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• How much thermal paste should apply to the CPU?

  - by iconiK

  There a million different pages around the Internet with conflicting information on how much thermal paste to apply and how to spread it. Some say a half-bean-sized drop in the middle, others say a circle or rectangle on the CPU. Some tell you to let the heatsink's base spread it, while others say to spread it with a knife or your finger with a plastic bag on it. Some coolers even come it with applied fully on the base, like Corsair H50 and all Arctic Cooling products. What is the best way to apply and spread thermal paste, and how much of it?

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