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• .NET Developer Basics – Recursive Algorithms

  Recursion can be a powerful programming technique when used wisely. Some data structures such as tree structures lend themselves far more easily to manipulation by recursive techniques. As it is also a classic Computer Science problem, it is often used in technical interviews to probe a candidate's grounding in basic programming techniques. Whatever the reason, it is well worth brushing up one's understanding with Damon's introduction to Recursion.

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• An device with an unknown MAC address is connected to my router

  - by Yar

  There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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• VPN: Disable class based route addition for Windows XP/Vista

  - by brgsousa

  Paraphrasing this SuperUser link: When you set up a VPN, the Windows default is to enable "Use default gateway on remote network." A new default route is added to the routing table pointing to the remote network's gateway, and the existing default route has its metric increased to force all Internet traffic to traverse the tunnel and use the remote network's gateway. All traffic uses the VPN, and traffic destined for the outside world is directed to the remote gateway. When the VPN drops, the route to the remote gateway is removed and the original default route is set back to the original metric. Unchecking "use default gateway on remote network" means that new default route isn't added, so Internet traffic goes out the local gateway, but a new classful route is added to the routing table, using the local adapter's IP, pointing down the VPN. Only traffic destined for the classful network of the local adapter goes down the VPN. This may not be what you want. Checking "Disable class based route addition" means that classful route isn't added to your machine when the VPN starts up, and you'll need to add the appropriate routes for networks that should be routed through the tunnel. But, the option "Disable class based route addition" is available ONLY for Windows 7. How can I do something like that for Windows XP or Vista since they don't have that option? I have searched about for that but, no solution yet.

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• Which one to select for my future career; Java, C#, Azure or Apex?

  - by user636195

  Hi folks, This time, I am going to studying Masters in Computer Science in U.S.A after a week. I have been doing my B.Sc for the past three years and after my freshman year I started working on projects (in C# and very rarely in Java) for the past two years.(i.e while I was a second and third year student). Now I am in a college where all of the programming courses are going to be taken in Java only (using Eclipse) and I am going to stay in this college for 8 months on campus and then fully employed for two years in other companies as a CPT. I really love to work on Microsoft products because, for me, they are simple and easy to use and understand. My future plan is to work in Cloud computing and be a Cloud based business owner in the near future. Since the college is going to teach us and let us do every project in Java, I was confused which programming language to use that will help me and enhance me in my career, and of course I wanted to select the one I liked to do everytime. I also heard a lot about Azure (Microsoft’s ) and Apex (Salesforce.com’s cloud computing programming language). Would you please give me your advice and recommendation based on my situation? Should I have to study only Java, or should I have to study C# or Azure beside Java on my own? The reason I asked this is because, since I have no clue how Azure works and how long it will take me to know the language, I am really confused which one to select (Java Vs C# and Azure Vs Apex or if there is any popular and mostly used Cloud Computing langauge). Do you think I can get a job in cloud computing if I study Azure or Apex by my own without experience? There is also one issue I want to consider which is a short term issue is. i.e Salary. Since I have to pay my student loan, I also need to get a good job which will let me pay my loan within two years. But, as I said, my long term plan is, get experience in Cloud Computing (from programming to administrative part,i.e every area of cloud computing) and then have my own business may be within 5-10 years. What do you think? Thank you for your time.

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• Best books on Managing a Software Development Team? [closed]

  - by JohnFx

  The canonical books on software development is fairly well established. However, after reading through a dreadful book full of bad advice on managing programming teams this weekend I am looking for recommendations for really good books that focus on the management side of programming (recruiting, performance measurement/management, motivation, best practices, organizational structure, etc.) and not as much on the construction of software itself. Any suggestions?

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• How to add usbnet driver to the Linux kernel?

  - by StackedCrooked

  I want to add usb network support to a real-time Linux distribution we're using at work. USB devices are recognized, but when connecting a usb network adapter no network interface is created. From what I've read this requires recompiling the kernel build with usbnet support enabled. I don't mind doing this, but the problem is that I can't seem to find any instructions on how to do this. Can anyone point me in the right direction?

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• setting up static ip on linux

  - by user64908

  I understood the interface file in linux needs to be edited and the corresponding lines added. I don't understand what network and broadcast are for, it seems extra versus a windows static ip configuration. In my case my gateway is 192.168.5.1 and my machine ip is 192.168.5.101, what would be my network and broadcast address, is the below correct and what exactly do they mean? iface eth0 inet static address 192.168.5.101 gateway 192.168.5.1 netmask 255.255.255.0 network 192.168.5.0 broadcast 192.168.5.255

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• An unknown Mac is connected to my router?

  - by Yar

  There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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• Router as primary DNS server, Server as alternate? (or vice versa)

  - by Jakobud

  We have a very small business network, with a typical cable modem hooked into a DD-WRT router. We also run a basic CentOS server that does a variety of things, including acting as the primary DNS server for the office. The reason we need an internal DNS server is because we do a lot of internal web development and use the DNS server to add/remove various local network URLs for internal website testing (like www.testsite.com.local). It's very important for us to be able to add/remove URL aliases easily to the DNS. The problem with this setup is that if we ever need to restart the CentOS server or take it offline for upgrades or whatever, then internet access for all computers on the network is lost. That's because each computer relies on that DNS server to access the Internet I guess? The router is online all the time and very very rarely has to be restarted. It would be nice if we could setup my router to be the primary DNS server but still be running DNS on my server. So we could still add my local testing website URLs to the DNS server in CentOS, but be able to also take down the CentOS server without loosing Internet access on the network. How would this be setup? Would I simply need to add both router + server IP addresses to each computer's IP settings? Is the router primary DNS and server secondary DNS server? Or vice versa? Or can one of the two serve as a fallback for the other? What (if anything) needs to be configured on both the router and server in order for them to recognize that the other DNS server exists on the network? Does anyone have any newb-friendly resources for setting up something like this?

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• LDAP hangs for 10-15 minutes if user put wrong credentials

  - by danny

  Hi: I am using a windows 2003 server .I am using LDAP to allow my wireless clients connect to the network. I can connect fine to the network. But whenever I enter a wrong credential my LDAP server freezes and no new clients can log in to the wireless network for 10 -15 minutes. i am using a cisco wlc and its doing web-authentication.

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• (Windows 7) Dial Up Connection Locks up the Networking Service

  - by Nick

  I connect to the internet by using my cell phone as a dial up modem. (shh, don't tell my service provider) The connection is usually seamless and the speed is good (150kbps) but occasionally, the connection will get terminated by either the phone or the network, I'm not sure which and then Windows7 stubbornly doesn't acknowledge that the connection is dead so I can re-dial. I have tried to manually kill the connection, but then anything related to the network service refuses to open and the connection is still there. No "Network and Sharing Center", "Network Devices" and often the tray menu will refuse to pop open. The only way I have found to clear the problem is a full restart which. Logging off doesn't work and I haven't been able to find the service that is frozen. If anyone knows how to fix this or prevent this from happening or even how to go about troubleshooting I would be very grateful. ps. This problem is non-existant when tethering in linux on the same machine. (Ubunutu 9 and JoliOS)

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• Should Starting a Quick Game via Google Game Services be Iterated?

  - by user46727

  I have been following this tutorial for Google Play Game Services. I am a little unclear as to if the room matching algorithm should be looped or not. Can I just initialize this process once and let it time out? Or by iterating through it is it somehow rechecking it? If anyone had the approximate timeout that would be great as well. The problem stems from the fact that even when both phones are signing into the Game Services (at virtually the same time, my friend and I logged in), the room is not registering multiple people. One time my friend's phone even entered the game map, showing that he somehow was able to progress from the room initialization process. Relevant screen update methods which I am starting this matchmaking process: @Override public void update(float deltaTime) { game.options.updateTiles(); if(!isInitiated) { startQuickGame(); } } private void startQuickGame() { // auto-match criteria to invite one random automatch opponent. // You can also specify more opponents (up to 3). if(game.mGoogleClient.isConnected() && !isInitiated) { Bundle am = RoomConfig.createAutoMatchCriteria(1, 3, 0); // build the room config: RoomConfig.Builder roomConfigBuilder = RoomConfig.builder(Network.getInstance()); roomConfigBuilder.setMessageReceivedListener(Network.getInstance()); roomConfigBuilder.setRoomStatusUpdateListener(Network.getInstance()); roomConfigBuilder.setAutoMatchCriteria(am); RoomConfig roomConfig = roomConfigBuilder.build(); // create room: Games.RealTimeMultiplayer.create(game.mGoogleClient, roomConfig); // go to game screen this.mRoom = Network.getInstance().getRoom(); if(this.mRoom != null && this.mRoom.getParticipants().size() >= 2) { game.setScreen(new MultiGameScreen(game, this.mRoom)); isInitiated = true; } } else { game.mGoogleClient.connect(); } }

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• Workgroup connection: You may not have permission

  - by Afiefh

  I have two Windows XP computers connected through an Ad-Hoc network, computer A creates the network and B connects to it. Both computers are on the Mshome network and have file and printer sharing enabled, and they can ping one another through the adhoc network. The result is that computer A can see computer B, but B cannot see A in the workgroup. But when A tries to access B I get a "you might not have permission to access" error telling me to contact the administrator. I tries to google the error, but most posts talk about problems connecting different versions of Windows to each other. I tried turning off the firewalls on both machines and checking if the required services are running. Nothing helped. Please excuse my ignorance on Windows networking, I haven't used Windows in around 10 years.

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• Mac on My Router?

  - by Yar

  There is a computer that is not mine that is accessible on my network. I can even access its filesystem via AFP. What I want to know is how the computer could get on my network. My network is secured like this: Does that mean that they've used password cracking tools? The pass is not easy to guess but not hard to figure out via brute-force hacking, I guess. If I am being hacked, should I switch to WPA?

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• Virtualnetwork with virtualbox

  - by vpereira

  I would like to test a firewall solution. For that i would like to create a virtual network, without contact with my network and configure two virtual ethernet cards in my firewall. is that possible? say that my virtual machine has two ethernets? If with virtualbox is not possible, is it possible with any VM solution? To create virtual network and virtual devices in my virtual operational system

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• Is There A Need For End-To-End ExtJS to Microsoft Server (MVC-C#, LOB) 4 Day Class? (Poll Enclosed)

  Over the past couple years, the focus of the web development Ive been doing involves building highly flexible, highly scalable and straight forward web sites to implement and maintain Line of... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How does a frame retrieve the recipient's MAC address?

  - by Sarmen B.

  I am studying a Network+ book named All-in-one CompTia Network+ by Mike Meyers. In chapter 2 he talks about frames and how he represents them as canisters and the data within the frame contains the recipients mac address, senders mac address, data, and sequence number. What I don't understand is if the sender is sending a file via the network to the recipient, and this frame contains this data, how does the frame know what the recipients MAC address is before sending it? In regards to TCP/IP when it contains the recipients IP address, that's understandable how it retrieves that value. But I don't understand how it can retrieve the MAC address, because if that frame comes from the senders computer, goes into the router and copies itself to each and every computer that exists on the network, how did it have the MAC address to know where to go? Let me know if I'm not making sense.

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• Disable "No Internet Access" warning on Windows 7

  - by Grhm

  I have a number of Windows 7 machines on an isolated development network. There is no internet access from this network. Winodws 7 displays a yellow warning triangle on the network connection icon with a warning "No Internet Access". Is there anyway to disable this warning - I know the internet is inaccessable and always will be.

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• What exactly is a proxy?

  - by ojblass

  What does a proxy do and how is it related to getting out of my network to the outside network?

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• Combine WLAN with LAN

  - by fiatux

  I have D-link DSL 2750U wireless router. My PC and notebook are connected to router by Wi-Fi. They can share files or ping each other. I have a network storage unit plugged into router by an ethernet cable. Any of the computers cannot reach that storage unit or ping it. I guess my router isolates LAN network from WLAN network. Is there a way to combine them and get the router treat all devices connected to router in a single network? Thanks.

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• file sharing over external and internal networks

  - by pradvk

  Dear friends, Please tell me whether it is possible for someone on the external network to see the network folder shares of an internal LAN network in DHCP (192.168.x.x) through a Comp-A on an external network in DHCP (123.123.x.x) both networks are on different subnets but Comp-A has access to both networks and can see all the shared drives of both the internal and external networks using firewall is not an option because file sharing is required everywhere. care is taken from viruses/trojans... remote desktop etc is disabled on Comp-A Please let me know. Thanks and Regards pk

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• How to enable Integrated Load Balancing in Windows 8

  - by intodevelopment

  One of the cool new features many sites mention is "Integrated Load Balancing" in Windows 8. It is supposed to do the following: If you have multiple active network connections, Windows 8 will intelligently balance the network traffic between them for performance Source: Short: Some of what Microsoft didn’t show of Windows 8 I would love to see this feature in action. I am connected to a WiFi access point and to a different network by cable. Yet I don't see the operating system 'intelligently' balance the network load when for instance downloading multiple files. Is there any way to enable it or should I adjust my expectations?

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• Hyper-V share a folder between host and instance

  - by Fly_Trap

  I have a hyper-v server and several VM's (Virtual Machines). All the VM's are connected to an external network. I have tried to share a folder on the host and connect via the VM, I can do this but I'm prompted for a user name and password (as you would expect). I do not want to enable the "Everyone" group permissions as the physical host server is on a network of other servers. I have created a new virtual internal network in Hyper-V and given it's adapter a static ip of 33.0.0.100. I have added the virtual adapter to one of the VM's and set to IP to 33.0.0.2 (as advised here). Again this seems to work but I'm still prompted for a user name and password. Am I on the right lines here? I just want to share a directory from the host to the vm's without exposing the share to other servers on the network.

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• Want to make RTS strategy game, good starting point...?

  - by NOLANDI

  everybody! I find this community because I did research about game developing topics. So I decide to register on this community and ask for your opinion. I am not begineer in computer stuffs, and I know logic of programming language. I have little knowlegde of C, C++, Started to learn C#...but I was always oriented about other areas of IT. Amateur for game making but not in IT general! I am interested to make RTS strategy video game, isometric camera view (like PC GAME COMMANDOS for example)...so I started to read many books about DirectX, XNA, OpenGL, C#, AI programming...so I want to know where is good starting point for making this game genre. I want to use C# for this project, not C++, since I always had trouble with it, because it is too complicated. I see good oportunity for learning C#, since it has more object-oriented concept, with much less code and easy readible code for writing. Beside of that I know that C++ is the more powerful language until today. So I want to use DirectX and C# for my project. But it will required more time for sure, to learn it. I have trouble with finding books for c# & DirectX (I found just one), but in every next book, it is programming in c++! I read many web sites and they mentioned Slim DX, and in generaly, other articles which I read tells that it is possible to make good game with combination c# and directX, but...I don't have enough information about all this stuffs, so I became confused! It is really hard to have wish to learn c++ from scratch, since I started c# and I like it really...I don't try OpenGL, but I am already familiar with DirectX (some beginning stuffs), and I think that it is good and interesting. So, I decide to choose between maybe Unity3d and XNA first. XNA...hm, it sound that it is not bad solution, but I heard that it is already overcome technology, and I think that it is better to wait with XNA, until I try to make something with DirectX and C#, at first. But I dont know it is possible to make strategy game in XNA?! Maybe I am wrong. I also, find Unity 3D game engine and I find that I could programming there in C#, but many all examples are written in Javascript (Digital tutors videos)...But I generaly have wish to learn it too, because it allows to export games to mobile phones, there a lot of documentations, it is free, etc... I want to find best way to learn C# and DirectX, and make this game, but I dont know if it's possible to combine?! But maybe is good to first try Unity and XNA, because I am beginner?! Thank you all! I am willing to hear your expirience.

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• Extended service set help [closed]

  - by Cygnus X

  Sorry, this is going to be long and rambly. So, at home my network is set up as such: I have a "master router" that handles DHCP, from there I have a basic 5 port switch, and coming off that, I have a second router that I put in access point mode so that I could have better wireless coverage in my house. I cant seem to access it through a web browser since the master router kicked in and assigned it an ip address. But, i told you all that story, so that i could tell you this story. At the company I work for, they are trying to set up wireless cameras, according to the manual for these, in order to connect these cameras to our network, we need to get into the wireless router and associate the router with the cameras, but the problem is, the network is setup like my home network. Theres a "master router" which is a windows 2003 server, and then a wireless router in AP mode dishing out wireless access. I cant get into the router (by the way I'm not the system admin for the company, nor do i know jack squat about windows server , nor can I easily get in contact with the system admin. (quite the cluster f*k, eh?)) I've tried using wireshark to find the routers ip, dug through arp tables, tried plugging straight into the router, but I cant seem to get into the damn thing. Any ideas/suggestions would be greatly appreciated.

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