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  • Latency in TCP/IP-over-Ethernet networks

    - by aix
    What resources (books, Web pages etc) exist out there that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly.

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  • Creating a FAT file system and save it into a file in GNU/linux?

    - by RubenT
    I tell you my problem: I want to create a FAT file system and save it into a so I can mount it in linux using something like: sudo mount -t msdos <file> <dest_folder> Maybe I'm wrong and this cannot be done. Anyway, the problem is this: I'm trying to create the file containing a FAT file system, and I'm running this command: sudo mkfs.vfat -F 32 -r 112 -S 512 -v -C "test.fat" 100 That, accordingly to the mkfs man page, will create a FAT32 file system with 112 rootdir entries, logical sector size of 512 bytes, 100 blocks in total, and save it into "test.fat". But it fails, and the bash tells me: mkfs.vfat: unable to create test.fat What is going on? I think I am misunderstanding how mkfs works and how to use it. It is possible to write a filesystem into a file?

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  • Extract specific files in a tar archive using a wildcard

    - by AdrieanKhisbe
    I'm tring for a script to extract only jpeg pictures from an archive containing maky kind of files. To do so I tried first to use: tar -xf MyTar.tar *.jpg but it failed (*.jpg not found) and suggest me to use "--wildcard". So I tried tar -xf MyTar.tar --wildcard *.jpg I did that, but then the same error and a different warning saying yo me that the option "--wildcard" is ambigious. I've been over the manuel pages for tar, but didn't find a clue about the problem thanks

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  • Unix tool for splitting archives

    - by Richo
    I'm dumping an svn repository to a giant USB disk that is formatted FAT due to necessity (treat this as unchangeable). It conks out when you try to create a file larger than 4 gb. I need a tool that I can pipe data to that will create files of arbitrary size that when catted together will be the original file. I can write a tool to do this, but if one already exists I'd rather use it. Cheers EDIT: A second look at the split man page looks like it might work.

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  • How does one check whether the OS X "disabled" flag for launchd services is set?

    - by Charles Duffy
    According to the man page for launchctl (emphasis mine):    -w   Overrides the Disabled key and sets it to false. In previous versions, this option would modify the configuration file. Now the state of the Disabled key is stored elsewhere on-disk. Because the current state of the disabled flag is no longer set in the .plist file itself, checking for the Disabled key is no longer an accurate way to tell if the service will run on next boot. Where is this "elsewhere on-disk"? More to the point (and more importantly), how does one check whether this flag is set? Also, is it possible to set a service to run on next boot without forcing it to start immediately (as with launchctl load -w /Library/LaunchDaemons/my-service.plist)?

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  • Google Chrome issues

    - by Ben Hooper
    I'm an avid user of Chrome and would defend it to the death but there is no denying that it has issues, and I've been experiencing a lot of them recently. Issues Stuck tabs Issue: Around 60% of the time (higher when the system has just started), when Chrome is launched, some or all of the pinned tabs and startup pages will get stuck in the counter-clockwise-rotating "contacting server" mode and never snap out of it. Fix: Quit and launch Chrome until they load properly (this really isn't good, as quitting and launching Chrome can and has cleared all pinned tabs). Extra Information: If you stop the loading and re-enter the URL then the page will load perfectly. The amount of pinned tabs or startup pages seems to be irrelevant, but I could be wrong.   "Downloaded/out of" Issue: Each item in the download bar has a downloaded status section, formatted as "downloaded/out of". Sometimes Chrome doesn't display the "out of" part.   Collapsed settings windows Issue: In Chrome version 19(ish)+, settings are configured via overlayed / popup windows. Sometimes, the window will open fully collapsed. Fix: Resize Chrome's window or open the developer tools. "Network Error" with large downloads Issue: Sometimes, when downloading large files (500MB+) Chrome will download the entire file, the download status will freeze (for example, "1 GB/1 GB") for a few minutes, report "Network error", and delete the .crdownload file. Extra Information: The same file from the same website on the same computer downloads perfectly in other browsers. The website and file type seem to be irrelevant.   Information: I've experienced some of these issues on my home PC and some on my work PC, both of which are Windows 7 Ultimate x64. The only things that link them are my Google account (all settings are synced). Updating Chrome hasn't worked. Most of these issues presented themselves around about version 17 and have continued right through to 21 (current). Uninstalling Chrome, deleting all data in %programFiles(x86)%\Google and %localAppData%\Google, and reinstalling hasn't worked. I have yet to see whether disabling all extensions would make a difference, but it's hard to diagnose as these issues don't occur 100% of the time.   In my case, I don't know if there's an actual solution. I'm just curious as to whether anyone else is having similar issues to those that I'm experiencing. At least then I'll know it's an issue with Chrome itself.

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  • iptables: limiting bytes downloaded per IP per day?

    - by Miles
    On a public-facing web server, I'd like to limit the total bytes downloaded per IP address per day. For example, after a visitor downloaded 100MB, any additional requests would be dropped or rejected for the next 24 hours. Is it possible to accomplish this using iptables alone? The connbytes, connlimit, hashlimit, quota, and recent options all look promising, but the man page plays its cards close to the vest (e.g., "quota - Implements network quotas by decrementing a byte counter with each packet. --quota bytes The quota in bytes."). Would like to avoid using a proxy (like Squid) if possible.

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  • Folder permissions, red x on user object

    - by Matt Bear
    This question was asked before but was no answer. On shared folders on the file server, for the domain user name object under the security tab, the icon has a red x. There are no symptoms, the users have full access, there is just a red x on the icon for their name. Why is this? For clarification, logged into the windows 2008 r2 file server, browse to a users shared folder, right click on the folder, hit properties, click the security tab. The object representing the users domain name has a little red x on the lower right hand corner of the icon that looks like a single man. There are no symptoms beyond me wondering why the red x is there.

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  • 403 forbidden root on apache mac os x 10.7, but can access user directories

    - by philosophistry
    When I access http://localhost/ I get 403 Forbidden, but if I access http://localhost/~username it serves up pages. Things I've tried: - checking error logs - swapping out with original httpd conf files - changing DocumentRoot to my user directory (after all that should work if I can access ~username) I've seen 30 plus Q&A sites that all point to people having trouble with user directories being forbidden. I have the opposite problem, and so I'm tearing my hair out here.

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  • IIS permissions issue pointing docroot to Samba share

    - by lalalalalalalambda
    I have an IIS project which is stored on a Samba shared, network mounted with the following line: X: \\my-samba-server\dev /user:freddie Connectivity is fine, can read/write files from X:. In IIS, I'm trying to set it as the Physical path via \\my-samba-server\dev\folder\to\my\files, which results in the following 500.19 error: Config Error | Cannot read configuration file due to insufficient permissions It is by default trying to use the Pass-through authentication. If I try to set this to connect as the specific user freddie, I receive: The specified user does not exist What is the correct way to connect to a path which has been setup as described above? *Samba man pages indicate version 3.6 is on the Debian host

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  • Encrypt tar file asymmetrically

    - by DerMike
    I want to achieve something like tar -c directory | openssl foo > encrypted_tarfile.dat I need the openssl tool to use public key encryption. I found an earlier question about symmetric encryption at the command promt (sic!), which does not suffice. I did take a look in the openssl(1) man page and only found symmetric encryption. Does openssl really not support asymmetric encryption? Basically many users are supposed to create their encrypted tar files and store them in a central location, but only few are allowed to read them.

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  • Moving only the contents of a map and not the map itself on linux

    - by WebDevHobo
    Using the cp command, one can move files and folders on linux. I want to make a new user and move the contents of the skeleton map to their home directory. I use this command: cp -r /etc/skel/ /home/testuser/ However, this only creates a skel folder in testuser. The idea is that the contents of the /etc/skel folder be copied to /home/testuser, and not that a map be made in /home/testuser with those contents. I've checked the man page: Link, but nothing on there really seemed like the solution to me. Is there a way to do this, or do files really need to be moved manually, 1 by 1?

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  • Slackware 12 - installed cairo but cannot be seen

    - by piro
    Hi. I wanted to install gtk+ 2.16.5, so i also installed glib, pango and cairo. All seemed to work well, except for cairo. At first I got an error while configuring: Requested 'cairo = 1.6' but version of cairo is 1.4.12 I installed the newest version of cairo without any problems, i rebooted the comp and when i started the configure again the same thing happened and it showed me the same error. I also can see this: Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables BASE_DEPENDENCIES_CFLAGS and BASE_DEPENDENCIES_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. Can someone help me ? Thanks.

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  • IIS 7.5 log to: sql server vs file

    - by stacker
    I want to know if get IIS to log directly to the sql server is resource costive, and a better solution maybe generate log files, and each hour import this files to sql server. Does it VERY big cost to log to sql server each request directly? The pages are open connection to the database anyway for each request.

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  • Firefox can't establish a connection to the server at www.google.com

    - by Tom
    My home page in Firefox [v4.0] and Internet Explorer [v9.0.8112.16421, Update Versions RTM (KB982861)] is currently set to Google but when I depress the quick start icon to start up either browser, I am getting the following immediate results: Unable to connect (In Firefox) Firefox can't establish a connection to the server at www.google.com. The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web. Internet Explorer cannot display the webpage What you can try: Diagnose Connection Problems More information This problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website's domain. There might be a typing error in the address. If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section. For offline users You can still view subscribed feeds and some recently viewed webpages. To view subscribed feeds: Click the Favorites button , click Feeds, and then click the feed you want to view. To view recently visited webpages (might not work on all pages): Press Alt, click File, and then click Work Offline. Click the Favorites button, click History, and then click the page you want to view. Thankfully, I am able to use one browser that I have installed on my computer (Mathon v3.0.20.5000) to search online for technical assistance in this matter. I have seen several WinSock error issues mentioned; but, they are pointing to Windows XP and I am using Windows 7 Pro and remain uncertain whether anything identified as a fix for one OS will work in another. Things I've tried: HiJackThis Complete scan with Avira AntiVirus Premium. What am I overlooking? What should I do to address this problem?

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  • Need to set mailx variable to specify the From address

    - by user256817
    Running Oracle Linux 5.8 (which is just re-branded RedHat EL 5.8) I must change the From address. But we have scripts that use mailx which cannot be re-written to use any extra flags, so I'd like to use internal variables instead, which I see on the linux.die.net manpage on mailx is an alternative to the -r flag: -r address Sets the From address. Overrides any from variable specified in environment or startup files. Tilde escapes are disabled. The -r address options are passed to the mail transfer agent unless SMTP is used. This option exists for compatibility only; it is recommended to set the from variable directly instead. (Source: http://linux.die.net/man/1/mailx) How can we use these mailx variables? I tried adding this to /root/.mailrc, no go: set [email protected] I also added that to /etc/mail.rc with no gold. So I am turning to you, SuperUsers...

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  • Need Varnish configuration advise

    - by Patrick
    Hello fellows, I need some advise here for default.vcl. Here's the rules: 1) Only cache pages with urls that contains '/c/', the rest will pass 2) Set the cache expiry to 3 hours 3) Only cache and server from cache if cookie 'abc' and cookie 'xyz' is empty Thank you!

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  • Service tag urls

    - by Joshua
    I like to keep links to my various laptop support pages in my wiki. Dell makes it easy if you know the service tag. http://support.dell.com/support/topics/global.aspx/support/my_systems_info/details?ServiceTag={Your Service Tag} Are there any equivalent urls for HP, IBM, etc where you can just plug in your service tag equivalent and get a page with links to drivers and what not.

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  • samba - join domain - automatically set workgroup

    - by ftiaronsem
    Hell alltogether Since I have to do this often, I want to automate the joining to a windows domain as much as possible. While joining a domain one has to specify realm = in the /etc/smb.conf, along with some other settings like security=ads. Among these settingst there is workgroup = My question is: Is it possible to fill this field automatically by samba, while joining a domain? Normally I would just have said never, but as I tried leaving this field blank while joining a domain, i got: Failed to join domain: Invalid configuration ("workgroup" set to '', should be 'BLABLA') and configuration modification was not requested This has made me wondering whether an automatic modification is possible and if so how? A search on the internet and the man page brought no results. It would be really great, if someone could answer that. Thanks in advance ftiaronsem

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  • How to convert an CHM file into a single HTML file?

    - by ruslan
    I have tried many different CHM-to-HTML utilities, but I am having a difficult time finding one that is able to produce a single HTML file. I can decompile a CHM file using hh.exe, but I don't know how to easily merge the resulting files into a single HTML file, all while preserving the correct order of pages. Is there a free tool which can do this? If not, how can I merge the HTML files in order?

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  • Apache Subversion and Sudo - Why can't I resolve this hostname?

    - by Hollowsteps
    Okay, I made a mistake and I'll be the first to admit I'm new at this setup. I built a bare bones kit, installed Ubuntu on it, and attempted to set up a source control server for a project some friend and I were going to work on. Unfortunately, I screwed up. I followed a dodgy tutorial from 2005 and when it didn't work, started mixing and matching trying to get to the source of my problem. So now I sit before you, a broken and miserable man. Desperate to escape this annoying echo of 'Unable to resolve host computer.repositoryname.com', I uninstalled apache and subversion. That did not fix it. Next I tried to edit my /etc/hosts, going so far as to remove the reference to '127.0.1.1 computername'. Still I'm plagued. I know I messed up, is there any way to track down this wayward bug?

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  • Free java hosting?

    - by user24729
    Could anyone tell me some free hosting on which I can run my java web application even for a day? I don't want free forever. Free for 2-3 days will be fine I searched a lot on net but couldn't find anything. I just have some .html pages and some servlets in my java web application.

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