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• Server Fault Wiki: How does Subnetting Work?

  - by Kyle Brandt

  How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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• nginx reverse proxy hide redirects

  - by NZCoderGuy

  I've Nginx as a reverse proxy for two sites A and B running behind. The users go from public - reverse proxy - site A - site B (from A to B clicking links) What would be a typical configuration for a scenario like this? The url in the browser should be always the reverse proxy This is what I've so far but is not working worker_processes 2; error_log logs/error.log info; events { worker_connections 1024; } http { server { resolver 127.0.0.1; listen 8080; location / { set $target 'siteA'; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; rewrite ^(.*) $1 break; proxy_pass http://$target; } } }

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• Need help with Microsoft Access 07 & Reports

  - by Moe

  I'm finding it difficult to get MS reporting working to what I'd like to show. What I'm trying to do is: a) In my database store a URL file (HTTP external file), that is a .jpeg. I'd like to use that URL to call the image on the report sheet. I have tried to use 'Control source' on the data panel, but with no success. Any way I can get Dynamic Images to show up on each database. Also, I have a couple of Relational Databases. One Defines Values: For Example: DefinePets('petID','Name of Pet') The other one links the Main DB with the 'DefinePets' database. Eg: connect('petID','mainID','extraFeild') I'd like my report to Go into the "connect" Table, where the the currently viewed Record Value = mainID, then find petID and return Name of Pet. There is a many to many link between definePets and the main Table. (Therefore connect is joining them up) Or is that too much to ask from a simple package like Access?

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• Cannot open the device or file specified for office files

  - by MadBoy

  Recently I've noticed on couple of computers that when users try to open Office files or links (to server path) to office files they get this error "Windows cannot access the specified device path or file", but the files itself open up without problems. This happened on 4 Windows XP computers already with Office 2003 installed. One one computer it was XLSX file being opened and every time user executed it, it opened up, but the error pops out. On the other hand when I open it directly from Office it works fine, without error. On another 3 computers it was after user pressed on the link to Access DB and it error out, but Access began MSI configuration (since it was first time user logged in to his computer) and in the end it opened up properly. After closing access and doing it again problem disappeared. Some faulty patch ? Eset Smart Security 4 is installed.

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• How to relink user folders in Windows 7

  - by Jonathan

  The short story: Win7 lost track of my user folders location (desktop, my documents, my pictures etc...). They now reside on a different partition. How can I relink these folders? The long story: The way I partition my drives is: C: - SSD drive for Windows and Program Files D: - A large regular hard drive for all my user data The first thing I do after a fresh Win7 install is move my user folders to D:, by right clicking on these folders under C:\users\username\, choosing the Location tab and clicking on Move. I've just completed encryption of D: using TrueCrypt. It shows a lot of warnings before the encryption process, but (hrrmm...) it does not mention the fact that after encryption the data is located on a new drive letter, say E: This broke Win7's links to my special user folders. How can I relink these folders?

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• Deny Access to directories from unauthorized users

  - by JasonS

  I am not being paid for this and I would like to know the quickest way to do the following. A former client has a page which only members can access. This page links to a number of galleries which he only wants members to access. The galleries are not protected by any kind of authentication. What I assume is the quickest way to do this is to create a .htaccess file which only allow people to view the site when the come from a certain referrer. Would this work? My current thinking is that I could use a php script to deploy a .htaccess file into each of the gallery directories. (There are around a 100 at the moment.) I found this link which might be what I am after but to be honest I really don't get it. Is my thinking sound?

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• Getting rid of Plesk on a VPS

  - by TomA

  I've been using a relatively expensive VPS for hosting about 30 domains and I want to migrate to a cheaper one, without Plesk. Both use CentOS. My users will not care, they don't use Plesk anyway. But I will not be able to use it for creating new virtual hosts, FTP accounts etc. I'm not a commandline guru, esp. not in a server environment. Is there a free Plesk alternative for these purposes? I need to: Create a new virtual host with it's own FTP account Setup some basic FTP quota I don't need: DNS management (the new VPS service has an external DNS management GUI) Mail server management (I use Google Apps) Any suggestions welcome, from Plesk alternatives to "RTFM" or links to tutorials.

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• How can I get more pages with mod_rewrite

  - by wesszzel

  I use the mod_rewrite on my website, but some things arent working. I want four pages. Index Contact News Portfolio But all my links end up linking to Index! How do I change this? I use this code: <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] </IfModule> Thank you!!

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• Bonding: works only from one link

  - by Crazy_Bash

  I would like to install bonding with 4 links. but only one of them is active. eth4 is always active. the others simply don't work. those are my configs: DEVICE="eth2" BOOTPROTO="none" MASTER=bond0 SLAVE=yes USERCTL=no NM_CONTROLLED="no" ONBOOT="yes" DEVICE="eth3" BOOTPROTO="none" MASTER=bond0 SLAVE=yes USERCTL=no NM_CONTROLLED="no" ONBOOT="yes" DEVICE="eth4" BOOTPROTO="none" MASTER=bond0 SLAVE=yes USERCTL=no NM_CONTROLLED="no" ONBOOT="yes" DEVICE="eth5" BOOTPROTO="none" MASTER=bond0 SLAVE=yes USERCTL=no NM_CONTROLLED="no" ONBOOT="yes" DEVICE=bond0 IPADDR=<ip> BROADCAST=<ip> NETWORK=<ip> GATEWAY=<ip> NETMASK=<ip> USERCTL=no BOOTPROTO=none ONBOOT=yes NM_CONTROLLED=no /etc/modprobe.d/bonding.conf alias bond0 bonding options bond0 mode=4 miimon=100 updelay=200 #downdelay=200 xmit_hash_policy=layer3+4 lacp_rate=1 Linux: Linux 3.0.0+ #1 SMP Fri Oct 26 07:55:47 EEST 2012 x86_64 x86_64 x86_64 GNU/Linux what i've tried: downdelay=200 xmit_hash_policy=layer3+4 lacp_rate=1

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• How small is too small (of laptop for a programmer)

  - by defn

  Im thinking of replacing my HP Pavilion dv5-1004nr with Acer Aspire AS5738-6444, I'm a CS student... so im torn between screen size (liking the 15in and decent gpu.. but it weight nearly 8 pounds and battery can barely last 2 hours in power saver mode) and wanting something portable to carry to classes/take notes ect (3 pounds and up to 8 hour battery life of the acer) what would you guys suggest? acer any good? i love my hp keyboard.. (or have links to other good laptops, im aiming for 600$ range?)

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• Conect to remote server using

  - by Vlad

  Hi, I’m using Zen Cart (php) for my web site. I have images that is on my supplier’s remote server and my site is on Host Gator the only way to get the images show up on my site is to connect to their server using links to the images (per agreement). They tell me that ZenCart PHP does not allow you to serve images from a remote host. And I need to have a PHP programmer take a look at the code to see if he can manipulate the source code to allow this. Does anyone have solution for this? Thank you!! Vladi

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• How could I represent 1.625 by 0 or a 1 (binary digit)?

  - by pepito

  This is an excerpt from wikipedia about 'full rate' speech coding standard. Full Rate or FR or GSM-FR or GSM 06.10 was the first digital speech coding standard used in the GSM digital mobile phone system. The bit rate of the codec is 13 kbit/s, or 1.625 bits/audio sample. And this one is an excerpt from wikipedia about bit. In computing parlance, bit is the abbreviation for a single binary digit, represented by a 0 or a 1. How could I represent 1.625 by 0 or a 1? Actually, that's my lecturer's question that I could not answer. Some links to papers are more than welcome. Thanks in advance.

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• Problem after system update. Root permission denied, user lib permission denied.

  - by gregor

  As I updated opensuse 11.1 with update packages from october and november 2009, I couldnt use the command ping. For root it gives Permission denied and for a regular user I get libresolv.so.2: cannot open shared object file: Permission denied. The other coulprit besides the update could be the instalation of google-chrome (.deb file to .rpm, some symbolic links for libs to make chrome work). When the system rebooted, X server also became blank. Before the reboot it worked, as did chrome, but the ping command didnt work even before the reboot. Any ideas? I ran some sort of disk check from a rescue CD, libresolv seems as other libs, root has uid=0 ...

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• PostgreSQL: performance descrease due to index bloatper

  - by Henry-Nicolas Tourneur

  I'm running a PgSQL 8.1 on a CentOS 4.4 system (not upgradable unfortunately). There's a Java app running on top of the PgSQL daemon and we got to reindex the database every 2 months or so. Also important: the database isn't growing. It looks like the bloat is now coming faster than before and this tends to increase. My config is available here, autovacuum daemon is enabled and running quite often: pastebin.com/RytNj7dK You can also find the output of this query wiki.postgresql.org/wiki/Show_database_bloat 3 hours after running reindex: http://pastebin.com/raw.php?i=75fybKyd 72 hours after running reindex: http://pastebin.com/raw.php?i=89VKd7PC Does anyone have any idea what should I tweak to get rid of that growing bloat? Thanks for your help PS: due to antispam prevention system, I had to remove the first 2 http:// prefixes for my two first links.

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• Are there any home/soho NAS devices that will backup/sync to the cloud?

  - by 3rdparty

  Looking for a home office (SOHO) market (priced) network hard drive (NAS) that will sync some or all of its content to a cloud-based backup service. The only option I've been able to find so far is NetGear's [ReadyNAS Vault][1] however from what I've read it's not as secure as it could be, and the service is quite expensive ($200/yr for 50GB of cloud storage) - it's 'powered' by ElephantDrive Ideally would love to see something like Wuala integrated into a Lacie Network HDD - conveniently, I suspect this is in the works as Lacie recently acquired Wuala, however nothing has come of it yet. I know there are options to use rsync with a customizable NAS (such as the very versatile and hackable D-Link DNS-323, but the easier this is to setup and maintain, the better. Thanks! ps. I had many links posted within this question, but was limited to posting with only one due to anti-spam restrictions - gotta get my 'reputation' higher!

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• Why does a website server recieve local files much slower than recieve files on other websites?

  - by T...

  The server at http://any2djvu.djvuzone.org receives same files from local computers much slower than from links on other websites (with the same files have been uploaded to the other websites, such as dropbox.com). The speed of uploading a file from local computers to other websites such as dropbox is also much faster than to any2djvu website. For example, a pdf file of 17MB needs more than 1 min to be uploaded to any2djvu server from a local computer with normal ISP such as Comcast High-speed internet, but takes less than 3 seconds from a dropbox link to any2djvu server, and takes around 10 seconds from the same local computer to dropbox. I wonder why there is such big differences for the speeds of different uploading ways to a web server? Thanks!

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• How does iperf calculate throughput and jitter?

  - by Someone

  I've read that iperf basically tries to send as much information down a connection as quickly as possible reporting on the throughput achieved. This tool is especially useful in determining the volume of data that links between two machines can supply. is it possible to gather the same results by sending regular data, as in not testing data? what I'm trying to do is this; sending data in the foreground while in the back ground gather statistics (throughput and jitter). so can anyone tell me how iperf calculates these two values ?

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• Linux/bsd tcp load balancing with 10 gigabit ethernet

  - by user37899

  Okay, I've been looking at layer 4 load balancing solutions for 10 gigabit links. I need the following properties Works at 10Gig ethernet speeds. Can support long live tcp connections. up to 1mil live tcp connections. Balancer not involved in the return path. Fault tolerant with tcp session fail over. low latency and good through put. can be scripted. Either a software or hardware solution. Can it be done? Anyone doing this?

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• Troubleshooting MySQL : can connect to localhost but not to 127.0.0.1 or IP

  - by mireille raad

  Hello, I'd appreciate some help on this, it is bit tricky to find the correct keywords to google :) Using PHP i am able to connect using the following connection string : $link = mysql_connect('localhost', 'wlek' , 'wlek'); but when i use 127.0.0.1 or 10.10.40.15 (self-IP), i am getting connection failed Could not connect: Can't connect to MySQL server on '10.10.40.15' (13) I used yum install mysql , yum install php yum install php-mysql 1 - is there anything more i should install for php ? 2 - any troubleshooting tips ? 3 - what keywords, links do u recommend | % | mir | xdb | | 10.10.40.15 | mir | xdb | | localhost | mir | xdb | [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql port=3306 bind-address=0.0.0.0 old_passwords=1 [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid ~ appreciate it :)

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• Google Chrome Automatic Page Load

  - by WDC

  Google Chrome keeps loading the second page of certain websites which is helpful on sites like Netflix so that instead of clicking on a link for page 2, I can just continue scrolling down and it'll automatically have the next page ready for me. But on online clothing sites, it just gets backed up loading all the next pages, misplacing links and loading the next page so that it actually replaces the page I'm trying to view literally every millisecond. Considering clothing sites generally have upwards of 20 to 200 pages of clothing, this is really annoying since Chrome tries to load all of them. How do I turn off the automatic page load???

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• Microsoft Excel 2013

  - by Dan LaMoreaux

  We use a spreadsheet as our timecards. The template is stores on the server with links to it on the individual Desktops. I am trying to figgure out the VB so that wnen the cell for username (B5) is blank, the VB will place next sundays date in (B7). After the user enters thier name in B5, I need it to not change B7 again. If I use a formula in B7 "=IF(B5="",TODAY()+8-WEEKDAY(TODAY()),B7)" i need to enable the curcular calcualtions, which don't follow from the template to the spreadsheet, thus causing errors for every individual. Corporate says that they need to be in Excel, because of the import software. Otherwise I'd use Word and the "CreateDate" function. I've been trying to learn the VB to do it, but I was hoping that soem expert could whip out the code in 5 min. flat and just let me disect it.

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• OpenGL - What softwares are needed to learn Open GL on Osx

  - by sugar

  I strongly believe that - my question isn't related to programing, so that I asked my question here ( super user ). Here, I am not asking what links should I follow to learn OpenGL. I am asking that - What software are needed for learning Open Gl? Let me explain more briefly, I want to learn openGL for iPhone game development. Tools for creating 3D objects which are preferable tools are targeted for osx would be preferable. In short I would like to know, The list of application which are used by iPhone professional game developers on osx. Thanks in advance for sharing your knowledge. Please add comment before down voting. Sagar.

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• What is the current state of development for the FLAC codec?

  - by TwentyMiles

  I have a pretty large collection of FLAC files created from my CD collection. I love the FLAC format and the sound quality that you can get from it. Lately, however, I've been trying to write a few tools to manipulate the files and I've been noticing what seems to be a stagnation of the community around the codec. Some of the links on the official FLAC page point to thing that are no longer relevant (7digital, for example, appears to no longer sell FLAC encoded songs). It's pretty hard to find hardware players that support FLAC any more (most noticeably it's not present on lower end players when it used to be, and playback is absent on Android). Programming language tools (Java and .NET libraries) are at best old, and at worst unfinished. What's the current state of FLAC development? Has it been replaced by another codec?

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• vimperator copy/pasting

  - by hasen j

  I'm trying out vimperator, I mainly wanted it for the hjkl scrolling, I like it's "hint" system for following links, these two features are really all I need; I think. I don't mind the other features, it just sometimes get in my way. The thing that annoys me the most is copy/pasting. I'm used to ctrl-c/ctrl-v, I don't mind using another shortcut, but .. :help yank indicates that copying selected text is done with Y, but the only method mentioned for pasting is the middle mouse button! This is so ridiculously against the spirit of vim! How can I paste in vimperator without using the mouse?

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• How to disable Yoxos popups in Eclipse on Linux

  - by MikeN

  I used the http://eclipsesource.com/en/yoxos/yoxos-ondemand/? tool to build an Eclipse distribution, but they keep giving these annoying Yoxos popups. I don't even get whether Yoxos is free or paid or just annoying as heck. How do you get rid of these Yoxos popups? This is the text of the popup: POPUP: Thank you for evaluating Pydev Extensions. If you wish to license Pydev Extensions, please visit the link below for instructions on how to buy your license: Buy When you license it, not only will you get rid of this dialog, but you will also help fostering the Pydev Open Source version. If you wish more information on the available features, you can check it on the link below: Features Matrix Or you may browse the homepage starting at its initial page: Pydev Extensions Main Page The links don't allow you to register buy the PyDev extensions. How can I switch to free pydev extensions? My other eclipse installs I just used the free PyDev and it is exactly the same.

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