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How can I make IPv6 on OpenVPN work using a tap device?

- by Lekensteyn

I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 server side (set as gateway on client) 2001:db8::100:abc:2 tap0 client side 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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Solving programming problems or contributing code?

- by nischayn22

What are the best skills to develop for a college graduate?? Should one spend hours/days trying to solve problems on codechef or topcoder or contribute code to open source organizations? My personal experience says solving problems teaches you how to make optimal code and learn new programming techniques (which someone else has researched and made available) to solve problems, whereas contributing to open source teaches you how to organize code (so others can work on it), use coding conventions and make "real" use of what you have learnt so far, blah blah!! Also another thing to note is that many companies are hiring today based on one's problem solving skills (Is this something I should worry about?) P.S. I have done little of online problem solving and little of code contribution (via GSoC), but left confused what I should continue doing (as doing both simultaneously isn't easy).

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s expression representation for c

- by wirrbel

Experimenting with various lisps lately (clojure especially) i have wondered if there are any s expression based representations of (subsets) of c, so you could use lisp/closure to write macros and then convert the s-expression c tree to pure c. I am not asking for a to-c-compilers of lisp/scheme/clojure but more of using lisps to transform a c syntax tree. Little background to why i am asking this question: i find myself to really enjoy certain clojure macros like the threading macros -> doto etc. And i feel that they would be great in a non FP environment as well.

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Introduction to Oracle's Primavera P6 Analytics

Primavera P6 Analytics is a new product offering from Oracle which utilizes the Oracle BI product, Oracle Business Intelligence Suite Enterprise Edition Plus (Oracle BI EE Plus), to provide root-cause analysis, manage by exception and early-warning problem indicators from your P6 Enterprise Project Portfolio Management projects and portfolios. Out of the box reports and dashboards provide drill-down and drill-through insight to action where you can jump directly into the problem areas in Primavera P6 Enterprise Project Portfolio Management to course-correct or implement best practices based on successful project implementations. A complete view into all of your projects histories provides the trends and analysis needed to identify the best course of action to take next.

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How can I solve this SAT direct corner intersection edge case?

- by ssb

I have a working SAT implementation, but I am running into a problem where direct collisions at a corner do not work for tiled surfaces. That is, it clips on the surface when going in a certain direction because it gets hung up on one of the tiles, and so, for example, if I walk across a floor while holding both down and left, the player will stop when meeting the next shape because the player will be colliding with the right side rather than with the top of the floor tile. This illustration shows what I mean: The top block will translate right first and then up. I have checked here and here which are helpful, but this does not address what I should do in a situation where I don't have a tile-based world. My usage of the term "tile" before isn't really accurate since what I'm doing here is manually placing square obstacles next to each other, not assigning them spots on a grid. What can I do to fix this?

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How to make Devilspie Make an Applet be "silent" but then openable

- by Kendor

Am using gnome-shell with 11.10. I have two panel based applets (Toggl and Gnome Alarm Clock) that I run at startup. The issue is that they start as Windows, and I'd like them to start "silently" but still be able to recall their interface when I need them. I installed Devilspie and gDevilspie which properly "close" the applets after starting them, but there's a "Catch 22." Because of the "close" behavior, they can never be opened again as long as the Devilspie daemon is running.. Is there a way around this? An example of the rule I'm using is this: ( if ( begin ( is ( application_name ) "alarm-clock-applet" ) ) ( begin ( close ) ( println "match" ) ) )

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Samba access works with IP address only

- by Sebastian Rittau

I added a Debian etch host (hostname: webserver, IP address: 192.168.101.2) running Samba to a Windows network with a Windows 2003 PDC (IP address 192.168.101.3). The Samba server exports a public guest share, called "Intranet". The server shows up fine in the network, but trying to click on it produces an error dialog, stating I don't have the necessary permissions. So does entering \webserver manually and using \webserver\internet states that the path does not exist. Interestingly, accessing the share by IP address (\192.168.101.2 or \192.168.101.2\intranet) works fine. DNS is configured correctly, and "smbclient //webserver/intranet" on another Linux client works fine. One complicating issue is that the webserver is only a VMware virtual machine running on PDC server. Here is our smb.conf: [global] workgroup = Foobar server string = Webserver wins support = yes ; commenting out these wins server = 192.168.101.3 ; two lines has no effect dns proxy = no guest account = nobody [... snipped some unrelated bits, like logging ...] security = share [... snipped some password-related things ...] domain master = no [intranet] comment = Intranet path = /srv/webserver/contents browseable = yes guest ok = yes guest only = yes read only = yes create mask = 0775 directory mask = 0775

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Extremely Hybrid Game requirements

- by tugrul büyükisik

What system specifications would a game need if it was: Total players per planet: ~20000 Total players per team:~1M Total players per map(small volume of space or small surface over a planet): ~2000 Total players: ~10M(world has more players than this amount i think) Two of the players are commanders of opposite quadrants(from HUD of a strategy game). Lots of players use space-crafts as a captain(like 3d fps and rts). Many many players control consoles in those space-crafts as under command of captains.(fps ) Some players are still in stone-age trying to reinvent wheel in some planet. Players design and construct any vehicles they have. With good physics engine Has puzzles inside. Everyone get experience by doing stuff(RPG). Commerce, income or totally different resource-based group(like starcraft) Player classes(primitive: cunning and strong, wrapped: healthy, wealthy) Arcade top-down style firing with ships when people get bored very low chance of miraculous things.(mediclorians, wormholes, bugs) Different game-modes: persistent(living world), resetted periodically(a new chance for noobs), instant(pre-built space + hack&slash) I suspect this would need 128GB ram and 2048 cores.

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Detecting tile with height in isometric game

- by Carlos Navarro

I'm trying to create an isometric tile-based game (for iPhone) and I'm having trouble with height in tiles. What I currently do (without heights) is apply some mathematic transformations to my 2D-matrix (which represent the tiles) so that I know where in the screen (x,y) should I place the isometric tile. Then, when the user clicks somewhere in the screen, I take that values and pass them through a function (kind of f^-1) to get which tile it belongs to. This works perfectly. My problem is: imagine that I want some tiles to have a different height from others. In order to draw the tile itself its pretty simple, since the z-coordinate has no transformation in the isometric approach used in games (z'=z). BUT what if I want to calculate the tile coordinate (defined by X-tile and Y-tile) from the touch coordinates (x,y)? Any guess?

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How should I set up UDK with Git and CruiseControl?

- by Martin Sojka

For a new project in UDK, I'd like to set up a Git repository for version control and a CruiseControl.NET-based continuous integration solution. The good news is that he first part seems easy enough and CruiseControl.NET can work off Git repositories. The bad news is that according to my searches, nobody has ever tried to do this. Ideally, I'm looking for a step-by-step guide on how to set up such a development environment assuming more than one development computer, one central repository for the "master" branch, and one machine for building and packaging the binaries via CruiseControl.NET. Related: Version control system for game development with UDK? Options for UDK and version control repositories? CruiseControl.NET and Git

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Have you downloaded the All-In-One Code Framework?

- by Eric Nelson

The Microsoft All-In-One Code Framework is a free, centralized code sample library provided by the Microsoft Community team. It aims to provide typical code samples for all Microsoft development technologies. The team listens to developers’ pains in MSDN forums, social media and various developer communities and write code samples based on developers’ frequently asked programming tasks. Additionally, our team offers a free code sample request service. Awesome?! I think so. Have also just added it to 99 technical resources for developers and architects inside ISVs – also worth checking out. Check it out on codeplex

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Transactional Interceptors in Java EE 7 - Request for feedback

- by arungupta

Linda described how EJB's container-managed transactions can be applied to the Java EE 7 platform as a whole using a solution based on CDI interceptors. This can then be used by other Java EE components as well, such as Managed Beans. The plan is to add an annotation and standardized values in the javax.transaction package. For example: @Inherited @InterceptorBinding @Target({TYPE, METHOD}) @Retention(RUNTIME) public @interface Transactional { TxType value() default TxType.REQUIRED } And then this can be specified on a class or a method of a class as: public class ShoppingCart { ... @Transactional public void checkOut() {...} ... } This interceptor will be defined as part of the update to Java Transactions API spec at jta-spec.java.net. The Java EE 7 Expert Group needs your help and looking for feedback on the exact semantics. The complete discussion can be read here. Please post your feedback to [email protected] and we'll also consider comments posted to this entry.

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Existing Instance, Shiny New Disks

- by merrillaldrich

Migrating an Instance of SQL Server to New Disks I get to do something pretty entertaining this week – migrate SQL instances on a 2008 cluster from one disk array to another! Zut alors! I am so excited I can hardly contain myself, so let’s get started. (Only a DBA could love this stuff, am I right? I know.) Anyway, here’s one method of many to migrate your data. Assumption : this is a host-based migration, which just means I’m using the Windows file system to push the data from one set of SAN disks...(read more)

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Few New Features Added to Geekswithblogs.net

- by Staff of Geeks

After reviewing some of the feedback from our bloggers we added a couple new features to Geekswithblogs.net and there are still more to come. Here is a list of the features we added. Fixed the Twitter parser to better support URLs and Hash Tags Added some hooks behind the scenes to tags posts with common keywords automatically Added Facebook likes and Tweets to the bottom of every post Cleaned up a few skins Images on the main page for bloggers who use Gravatar or Twitter integration Random bug fixes based on Log We are definitely working to make Geekswithblogs.net faster and better. If you have any suggestions, please feel free to share them with the team. On a side note, if that suggestion is move to WordPress, I will reply to you with stop writing ASP.NET for your day job and move to PHP. That request is the equivalent in my eyes. If we have enough bloggers leave the Microsoft .NET Platform for their main source of income, we might consider it. Technorati Tags: Geekswithblogs.net,Features,Version 4.0

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When should one use "out" parameters?

- by qegal

In Objective-C, there are several methods like initWithContentsOfFile:encoding:error: where one passes in a reference to an NSError object for the error: parameter. In this example, the value of the NSError object passed in can change based on what goes on at runtime when the method is being called and whether the body of the method was executed in a certain way successfully. In a way I think of this NSError object as sort of like a second return value from the method, and only differs from an object anObject in the statement return anObject; in that when this statement is called, execution leaves the method. So my question is, not only in the context of error handling in Objective-C, but in general, when should one use an "out" parameter in place of returning said value in a return statement?

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How to determine if class meets single responsibility principle ?

- by user1483278

Single Responsibility Principle is based on high cohesion principle. The difference between the two is that highly cohesive classes feature a set of responsibilities that are strongly related, while classes adhering to SRP have just one responsibility. But how do we determine whether particular class features a set of responsibilities and is thus just highly cohesive, or whether it has only one responsibility and is thus adhering to SRP? Namely, isn't it more or less subjective, since some may find class very granular ( and as such will consider a class as adhering to SRP ), while others may find it not granular enough?

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Efficient way of detecting a touched object in a game?

- by Pin

Imagine a Sims-like 2D game for a touch based mobile phone where one can interact with virtually any object in the scene. How can I efficiently detect which object is being touched by the player? In my short experience, looping through all the visible objects in the scene and checking if they're touched has so far done the job, but when there may be many many moving objects in the screen that sounds kind of inefficient isn't it? Keeping the visible moving objects list can consume time in itself as one may have to loop through all of them each frame. Other solutions I've thought are: Spatial hashing. Divide the screen as a grid and place the visible objects in the corresponding bucket. Detection of the clicked object is fast but there's additional overhead for placing the objects in the correct bucket each frame. Maintaining a quad-tree. Moving objects have to be rearranged all the time, the previous solution looks better. What is usually done in this case?

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Server slowdown

- by Clinton Bosch

I have a GWT application running on Tomcat on a cloud linux(Ubuntu) server, recently I released a new version of the application and suddenly my server response times have gone from 500ms average to 15s average. I have run every monitoring tool I know. iostat says my disks are 0.03% utilised mysqltuner.pl says I am OK other see below top says my processor is 99% idle and load average: 0.20, 0.31, 0.33 memory usage is 50% (-/+ buffers/cache: 3997 3974) mysqltuner output [OK] Logged in using credentials from debian maintenance account. -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.63-0ubuntu0.10.04.1-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 370M (Tables: 52) [--] Data in InnoDB tables: 697M (Tables: 1749) [!!] Total fragmented tables: 1754 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 19h 25m 41s (1M q [28.122 qps], 1K conn, TX: 2B, RX: 1B) [--] Reads / Writes: 98% / 2% [--] Total buffers: 1.0G global + 2.7M per thread (500 max threads) [OK] Maximum possible memory usage: 2.4G (30% of installed RAM) [OK] Slow queries: 0% (1/1M) [OK] Highest usage of available connections: 34% (173/500) [OK] Key buffer size / total MyISAM indexes: 16.0M/279.0K [OK] Key buffer hit rate: 99.9% (50K cached / 40 reads) [OK] Query cache efficiency: 61.4% (844K cached / 1M selects) [!!] Query cache prunes per day: 553779 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 34K sorts) [OK] Temporary tables created on disk: 4% (4K on disk / 102K total) [OK] Thread cache hit rate: 84% (185 created / 1K connections) [!!] Table cache hit rate: 0% (256 open / 27K opened) [OK] Open file limit used: 0% (20/2K) [OK] Table locks acquired immediately: 100% (692K immediate / 692K locks) [OK] InnoDB data size / buffer pool: 697.2M/1.0G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_size (> 16M) table_cache (> 256)

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The best way to hide data Encryption,Connection,Hardware

- by Tico Raaphorst

So to say, if i have a VPS which i own now, and i wanted to make the most secure and stable system that i can make. How would i do that? Just to try: I installed debian 7 with LVM Encryption via installation: You get the 2 partitions a /boot and a encrypted partition. When booting you will be prompted to fill in the password to unlock the encryption of the encrypted partition, Which then will have more partitions like /home /usr and swapspace which will automatically mount. Now, i do need to fill in the password over a VNC-SSL connection via the control panel website of the VPS hoster, so they can see my disk encryption password if they wanted to, they have the option if they wanted to look at what i have as data right? Data encryption on VPS , Is it possible to have a 100% secure virtual private server? So lets say i have my server and it is sitting well locked next to me, with the following examples covered bios (you have to replace bios) raid (you have to unlock raid-config) disk (you have to unlock disk encryption) filelike-zip-tar (files are stored in encrypted archives) which are in some other crypted file mounted as partition (archives mounted as partitions) all on the same system So it will be slow but it would be extremely difficult to crack the encryption. So to say if you stole the server. Then i only need to make the connection like ssh safer with single use passwords, block all incoming and outgoing connections but give one "exception" for myself. And maybe one for if i somehow lose my identity for the "exeption" What other overkill but realistic security options are available, i have heard about SElinux?

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Mastering the Art of SEO

As the name indicates this article is based on one of the very advance concept nowadays which is none other than SEO which stands for Search engine Optimization. Some years back people were concerned only about the main problems or issues of a particular subject matter. But due to the advancements in technology and specifically internet, things have changed a lot. Now each matter is observed and analyzed very deeply and that is the reason that we are getting better results nowadays. One such thing, which has gained the status of universal fame as well, is internet.

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Find Nearest Object

- by ultifinitus

I have a fairly sizable game engine created, and I'm adding some needed features, such as this, how do I find the nearest object from a list of points? In this case, I could simply use the Pythagorean theorem to find the distance, and check the results. I know I can't simply add x and y, because that's the distance to the object, if you only took right angle turns. However I'm wondering if there's something else I could do? I also have a collision system, where essentially I turn objects into smaller objects on a smaller grid, kind of like a minimap, and only if objects exist in the same gridspace do I check for collisions, I could do the same thing, only make the gridspace larger to check for closeness. (rather than checking every. single. object) however that would take additional setup in my base class and clutter up the already cluttered object. TL;DR Question: Is there something efficient and accurate that I can use to detect which object is closest, based on a list of points and sizes?

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Growing a Linux software RAID5 array

- by chrismetcalf

On my home file server, I've got a 1.5TB software RAID5 array, built from four 500gb Western Digital drives. I've got a fifth drive that I usually run as a hot spare (but have out of the array at the moment), but if I can I'd like to add that to the array and grow it to 2TB since I'm running out of space. I Googled for guidance, but there seem to be a lot of differing opinions out there (many of them probably now out-of-date) as to whether or not that is possible and/or smart. What's the right way to go about this, or should I start looking into building a new array with more space? Version details: %> cat /etc/issue Debian GNU/Linux 5.0 \n \l %> uname -a Linux magrathea 2.6.26-1-686-bigmem #1 SMP Sat Jan 10 19:13:22 UTC 2009 i686 GNU/Linux %> /sbin/mdadm --version mdadm - v2.6.7.2 - 14th November 2008 %> cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md1 : active raid1 hdc1[0] hdd1[1] 293033536 blocks [2/2] [UU] md0 : active raid5 sde1[3] sda1[0] sdc1[2] sdb1[1] 1465151808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

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User prompts (MessageBox) with MVVM

- by mukapu

The problem statement: I am tired of thinking how to show a simple message box or user prompt and act based on the response in Model-View-View-Model (MVVM). Common approaches: - It's ok, let's just do this one thing from ViewModel and mock this out for unit testing - Design my own dialog, then what to do from there - Can I write something in view code behind, ah yes, that seems to be the only way out, as anyway MVVM is still not matured... - and what not? I am pretty much one among the few frustrated out in this world looking for some convincing answers. I think we can do it a little neater without having the feeling of violating any of our self defined rules! Solution: The Control - Implement a simple control with no designer visibility. - Allow a property to be bound to tell when to show the MessageBox - Provide command binding for possible user actions, Yes, No, Cancel... How do I Use? - Just place the necessary XAML tags in the view - Implement the command for all user actions in the View Model - Run unit tests on the commands

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Sign multiple domains with single Domain Key (dk-filter)

- by Lashae

Motivation The private shopping website GILT, send periodical update emails from giltgroupe.bounce.ed10.net however all of the mails are signed with domain keys of giltgroupe.com. mailed-by giltgroupe.bounce.ed10.net signed-by giltgroupe.com My Story I couldn't manage to sign x.com with y.com 's domain key using dk-filter under Debian Lenny with postfix. If I try to init dk-filter service with following arguments: DAEMON_OPTS="$DAEMON_OPTS -d x.com,y.com -c nofws -k -i /var/dk-filter/internal_hosts -s /etc/dk-keys.conf" dk-filter service signs with domain x.com (d=x.com) If I change the daemon arg.s as following: DAEMON_OPTS="$DAEMON_OPTS -d x.com -c nofws -k -i /var/dk-filter/internal_hosts -s /etc/dk-keys.conf" then emails sent From y.com is not being signed. the dk-keys.conf file is as follows: *:/var/dk-filter/y.com/mail I managed to do same thing with DKIM, works perfect. However DK doesn't seem to work. I don't have any problem signing y.com's emails with y.com's key and x.com's emails x.com's key, which indicates there is no configuration problem. Do you have any experience/advice to make it possible to sign emails from multiple domains by a specific chosen domain?

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Can I use a desktop as a network server?

- by Jhourlad Estrella

Pardon me if I'm asking the wrong question. But I am a newbie in networking and I'm not sure what direction to go on this. I have just setup an Ubuntu Desktop. I am planning to convert it to a network server without losing the GUI interface (again, I'm a newbie) and use it to manage and monitor user access to a network with a small number of network terminals all running on Windows. My purpose is to use the new server to filter sites accessed by each terminals, monitor sites being visited by employees and grant access to both group and user-specific folders based on their IP address. Is this possible? What server software do I need to install? How do I structure the hardware? (I have a router, a hub, the Ubuntu server and the network terminals) How do I assign privileges to users and monitor them at the same time? Thank you in advance for your replies.

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