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  • Dynamic DNS Updates with Wireless and Wired interfaces

    - by Phaedrus
    We have offices full of Windows & Mac users who obtain IP addresses from a Windows DHCP server, which in turn updates Dynamic DNS entries. We are noticing major inconsistencies with the entries, and have found that the problem is occurring more on Macs than on windows, and even more when users are frequently switching from wired to wireless adapter, which makes sense, as this sequence occurs: User enables wired adapter and registers Proper DNS User enables wireless adapter and registers 2nd proper DNS entry user switches off wireless manually and 2nd entry remains improperly until scavenge. Our help desk folks rely heavily (maybe more than they should) on the dynamic entries as part of their business process. For example, the user submits a help desk ticket, and the staff member expects to be able to remote desktop to their machine by hostname, which is hyperlinked in the helpdesk ticketing app. We have implemented multiple solutions & band-aids to different symptoms of the problems such as: Using DNS Reservations for Macintosh PCs Using DNS Scavenging to remove old records Switching from a Cisco DHCP server to the Windows DHCP Server But no matter what we do, it seems impossible to maintain perfect records. Has anyone encountered this problem before? What is industry best practice? Comments & Suggestions are much appreciated, /P

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  • Dynamically load and call delegates based on source data

    - by makerofthings7
    Assume I have a stream of records that need to have some computation. Records will have a combination of these functions run Sum, Aggregate, Sum over the last 90 seconds, or ignore. A data record looks like this: Date;Data;ID Question Assuming that ID is an int of some kind, and that int corresponds to a matrix of some delegates to run, how should I use C# to dynamically build that launch map? I'm sure this idea exists... it is used in Windows Forms which has many delegates/events, most of which will never actually be invoked in a real application. The sample below includes a few delegates I want to run (sum, count, and print) but I don't know how to make the quantity of delegates fire based on the source data. (say print the evens, and sum the odds in this sample) using System; using System.Threading; using System.Collections.Generic; internal static class TestThreadpool { delegate int TestDelegate(int parameter); private static void Main() { try { // this approach works is void is returned. //ThreadPool.QueueUserWorkItem(new WaitCallback(PrintOut), "Hello"); int c = 0; int w = 0; ThreadPool.GetMaxThreads(out w, out c); bool rrr =ThreadPool.SetMinThreads(w, c); Console.WriteLine(rrr); // perhaps the above needs time to set up6 Thread.Sleep(1000); DateTime ttt = DateTime.UtcNow; TestDelegate d = new TestDelegate(PrintOut); List<IAsyncResult> arDict = new List<IAsyncResult>(); int count = 1000000; for (int i = 0; i < count; i++) { IAsyncResult ar = d.BeginInvoke(i, new AsyncCallback(Callback), d); arDict.Add(ar); } for (int i = 0; i < count; i++) { int result = d.EndInvoke(arDict[i]); } // Give the callback time to execute - otherwise the app // may terminate before it is called //Thread.Sleep(1000); var res = DateTime.UtcNow - ttt; Console.WriteLine("Main program done----- Total time --> " + res.TotalMilliseconds); } catch (Exception e) { Console.WriteLine(e); } Console.ReadKey(true); } static int PrintOut(int parameter) { // Console.WriteLine(Thread.CurrentThread.ManagedThreadId + " Delegate PRINTOUT waited and printed this:"+parameter); var tmp = parameter * parameter; return tmp; } static int Sum(int parameter) { Thread.Sleep(5000); // Pretend to do some math... maybe save a summary to disk on a separate thread return parameter; } static int Count(int parameter) { Thread.Sleep(5000); // Pretend to do some math... maybe save a summary to disk on a separate thread return parameter; } static void Callback(IAsyncResult ar) { TestDelegate d = (TestDelegate)ar.AsyncState; //Console.WriteLine("Callback is delayed and returned") ;//d.EndInvoke(ar)); } }

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  • How do you apply proxy settings per computer instead of per user?

    - by Oliver Salzburg
    So far, I've used a user group policy object utilizing Internet Explorer maintenance to set a proxy for the user in IE. We have now deployed the Enterprise Client (EC) starter group policy to our domain and this policy affects this behavior. The EC group policy uses the policy Make proxy settings per-machine (rather than per-user). This policy describes itself as: This policy is intended to ensure that proxy settings apply uniformly to the same computer and do not vary from user to user. Great! This seems to be an improvement over my previous setup. If you enable this policy, users cannot set user-specific proxy settings. They must use the zones created for all users of the computer. What zones and where do I configure the proxy settings for them? I assumed the policy would simply take the user settings and apply them, but that's not what's happening. Now no proxy server is set at all. So my previous settings obviously no longer have any effect. So far, I've only come up with solutions that involved direct manipulation of the Windows registry. Which is fine, I guess, but the way the proxy is configured for users makes it appear as if there could be a higher level approach.

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  • Do unused vertices in a 3D object affect performance?

    - by Gajet
    For my game I need to generate a mesh dynamically. Now I'm wondering does it have a noticeable affect in FPS if I allocate more vertices than what I'm actually using or not? and does it matter if I'm using DirectX or OpenGL? Edit Final output will be a w*h cell grid, but for technical issues it's much easier for me to allocate (w+1)*(h+1) vertices. Sure I'll only use w*h vertices in indexing, and I know there is some memory wasting there, but I want to know if it also affect FPS or not? (Note that mesh is only generated once in each time you play the game)

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  • does unused vertices in a 3D object affect performance?

    - by Gajet
    For my game I need to generate a mesh dynamically. now I'm wondering does it have a noticeable affect in fps if I allocate more vertices than what I'm actually using or not? and does it matter if I'm using DirectX or OpenGL? edit final output will be a w*h cell grid, but for technical issues it's much more easier for me to allocate (w+1)*(h+1) vertices. sure I'll only use w*h vertices in indexing, and I know there is some memory wasting there, but I want to know if it also affect fps or not? (note that mesh is only generated once in each time you play the game)

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  • PropertyGrid: Merging multiple dynamic properties when editing multiple objects

    - by Andrei Stanescu
    Hi, Let's say I have a class A and a class B. I would like to edit using .NET PropertyGrid multiple instances of A and B simultaneously. The desired behavior would be to have the intersection of properties displayed. If A and B have static (written in the source code) properties everything works fine. Selecting A and B instances will only display the intersection of properties. However, if A and B also have dynamic properties (returned as a PropertyDescriptorCollection through the GetProperties() method) the behavior is wrong. When selecting multiple objects I will only see those static properties and none of the dynamic ones. When I select only one instance I can see all properties (static and dynamic). Anybody any ideas? I couldn't find anything on the internet.

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  • Algorithm and data structure learning resources for dynamic programming

    - by Pranav
    Im learning dynamic programming now, and while I know the theory well, designing DP algorithms for new problems is still difficult. This is what i would really like now- A book or a website, which poses a problem which can be solved by dynamic programming. Also there is the solution with an explanation available, which i would like to see if i cant solve the problem even after butting my head at it for a few hours. Is there some resource that provides this sort of a thing for several categories of algorithms- like graph algorithms, dynamic programming, etc? P.S. I considered Topcoder, but the solutions there are not really appropriate for learning to implement efficient solutions.

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  • How to make schema and code dynamic?

    - by Jonarch
    I want to make my database schema and application code as dynamic as possible to handle "unknown" use cases and changes. Developing in PHP and MySQL. Twice now I have had to change my entire schema including table and column names and this means the developers have to go back to the application code and modify all the SQL queries and table/columns names. So to prevent this I want to if just like we do on pages where we have page content, title bar etc dynamic like a %variable%, can we do it for the schema and maybe even for the php code functions and classes somehow? It takes weeks to re-do all changes like this vs if it is dynamic it can be done in under a day.

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  • Problems with dynamic programming

    - by xan
    I've got difficulties with understanding dynamic programming, so I decided to solve some problems. I know basic dynamic algorithms like longest common subsequence, knapsack problem, but I know them because I read them, but I can't come up with something on my own :-( For example we have subsequence of natural numbers. Every number we can take with plus or minus. At the end we take absolute value of this sum. For every subsequence find the lowest possible result. in1: 10 3 5 4; out1: 2 in2: 4 11 5 5 5; out2: 0 in3: 10 50 60 65 90 100; out3: 5 explanation for 3rd: 5 = |10+50+60+65-90-100| what it worse my friend told me that it is simple knapsack problem, but I can't see any knapsack here. Is dynamic programming something difficult or only I have big problems with it?

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  • Dynamic SQL queries in code possible?

    - by SeanD
    Instead of hard coding sql queries like Select * from users where user_id =220202 can these be made dynamic like Select * from $users where $user_id = $input. Reason i ask is when changes are needed to table/column names i can just update it in one place and don't have to ask developers to go line by line to find all references to update. It is very time consuming. And I do not like the idea of exposing database stuff in the code. My major concern is load time. Like with dynamic pages, the database has to fetch the page content, same way if queries are dynamic first system has to lookup the references then execute the queries, so does it impact load times? I am using codeignitor PHP. If it it possible then the next question is where to store all the references? In the app, in a file, in the DB, and how?

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  • Dynamic control

    - by Geetha
    Hi all, I am creating dynamic label and textbox based on the number of values from the database for the selected item of the dropdownlist. Then the dynamic labels will have the names and the text box with the values. To retain the values of these controls im using Page_init event. So im using cache to hold the selectteditem from the dropdownlist. Problem: The process is going fine. But if i try to refresh the page no items are selected in the dropdown list but the cache is not getting clear so using this cache value dynamic control are creating. Geetha

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  • Returning objects with dynamic memory

    - by Caulibrot
    I'm having trouble figuring out a way to return an object (declared locally within the function) which has dynamic memory attached to it. The problem is the destructor, which runs and deletes the dynamic memory when the object goes out of scope, i.e. when I return it and want to use the data in the memory that has been deleted! I'm doing this for an overloaded addition operator. I'm trying to do something like: MyObj operator+( const MyObj& x, const MyObj& y ) { MyObj z; // code to add x and y and store in dynamic memory of z return z; } My destructor is simply: MyObj::~MyObj() { delete [] ptr; } Any suggestions would be much appreciated!

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  • Test disk recovery

    - by AIB
    I had a 250GB hard disk having several NTFS partitions. The disk was a dynamic disk (created in windows). Now when I formatted windows (which was in another disk), the dynamic disk is shown as offline. I tried using the testdisk tool to recover the data and created a partial backup. Testdisk is able to list all partitions in the disk. All partitions are shown as type 'D' (Deleted). I want to change the 'D' to 'P' (Primary), 'L'(Logical), 'E' (Extended) appropriately and build a new partition table. If I can write the partition table to disk, the disk will be of 'basic' type and should be readable in all OS. What should be the appropriate partition types? I checked the files on the partitions and no OS was ound. So none of the partitions were bootable. Will randomly selecting P,L,E hurt the data in anyway?

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  • Which software raid modes does each version of Windows 7 support?

    - by Goyuix
    Being familiar with the software raid modes and dynamic disks from the server versions, I was wondering if there is a document or even just common crowd knowledge that indicated what software raid support was available for each version of Windows 7. Also - all the various raid levels supported for booting or just a data recovery mechanism (e.g. you can connect three RAID-5 dynamic disks to an already booted system). I would prefer to stay away from modified/copied DLL's from the server variants, as well - please note - this is Windows software RAID - not fake-raid from your BIOS or an add-on card.

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  • Excel 2007 Pivot Tables: Overlapping issue hampers my summary sheet

    - by Mike
    I've created a Workbook that has 5 Pivot Tables (PT). I want to make a summary sheet that holds all these PT's, but when they expand the 'not allowed to overlap issue' causes me updating problems - they don't update/expand effectively. Therefore, can't be printed off easily. The sheet would basically help my users give their bosses a simple quick overview of the larger worksheet - this way they would be more inclined to fill it in (give a little too get a little philosophy). I had thought about using the Camera Tool, but I'm not sure how you could make it dynamic, or whether it can be dynamic with a PT? Any advice, links or step-by-steps are greatly appreciated. Thanks Mike.

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  • nginx : backend https, proxy_pass shows ip

    - by Vulpo
    I am using nginx as a reverse proxy listening at port 80 (http). I am using proxy_pass to forward requests to backend http and https servers. Everything works fine for my http server but when I try to reach the https server through nginx reverse proxy the ip of the https server is shown in the client's web browser. I want the uri of the nginx server to be shown instead of the https backend server's ip (once again, this works fine with the http server but not for the https server). See this post on the forum Here is my configuration file : server { listen 80; server_name domain1.com; access_log off; root /var/www; if ($request_method !~ ^(GET|HEAD|POST)$ ) { return 444; } location / { proxy_pass http://ipOfHttpServer:port/; } } server { listen 80; server_name domain2.com; access_log off; root /var/www; if ($request_method !~ ^(GET|HEAD|POST)$ ) { return 444; } location / { proxy_pass http://ipOfHttpsServer:port/; proxy_set_header X_FORWARDED_PROTO https; #proxy_set_header Host $http_host; } } When I try the "proxy_set_header Host $http_host" directive and "proxy_set_header Host $host" the web page can't be reached (page not found). But when I comment it, the ip of the https server is shown in the browser (which is bad). Does anyone have an idea ? My other configs files are : proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; #proxy_hide_header X-Powered-By; proxy_intercept_errors on; proxy_buffering on; proxy_cache_key "$scheme://$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=cache:10m inactive=7d max_size=700m; user www-data; worker_processes 2; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; access_log /var/log/nginx/access.log; server_names_hash_bucket_size 64; sendfile off; tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; tcp_nodelay on; gzip on; gzip_comp_level 5; gzip_http_version 1.0; gzip_min_length 0; gzip_types text/plain text/html text/css image/x-icon application/x-javascript; gzip_vary on; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } Thanks for your help !

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  • virtualbox 2 vmware disk

    - by anol
    I have a virtualbox disk I'd like to convert to a vmware disk. The disk is dynamic which makes it a lot more trickier. If I follow the instructions at http://xpapad.wordpress.com/2010/02/21/migrating-from-virtualbox-to-vmware-in-linux, the vdi-to-raw conversion will result in a 2 TB file. I don't even have that much disk space! The first step therefore seems to be a dynamic to static conversion of the virtualbox disk, right? How do I do that or is there perhaps a better way to convert to vmware? Help!

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  • Hardware needed for 2000 users? [closed]

    - by Trcx
    I have school assignment that is fairly well defined, requiring us to come up with a plan for an environment serving dynamic web applications to 2000 users, and should be able to scale up to six thousand. I have done plenty of research as far as load balancing, redundancy, UPSs, etc, but am having a hard time figuring out how much hardware is actually needed in the way of physical servers, ram, processing power, etc. The assignment states that the server will have a lot of dynamic code, email, and a database are required, all utilizing the appropriate microsoft service (MS SQL, Exchange, IIS). I already plan on splitting them out on to separate servers, but can't even fathom the hardware requirements of something that large scale. Could someone with experience weight in on this, or point me two some good articles?

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  • Tunnel over HTTPS

    - by ephemient
    At my workplace, the traffic blocker/firewall has been getting progressively worse. I can't connect to my home machine on port 22, and lack of ssh access makes me sad. I was previously able to use SSH by moving it to port 5050, but I think some recent filters now treat this traffic as IM and redirect it through another proxy, maybe. That's my best guess; in any case, my ssh connections now terminate before I get to log in. These days I've been using Ajaxterm over HTTPS, as port 443 is still unmolested, but this is far from ideal. (Sucky terminal emulation, lack of port forwarding, my browser leaks memory at an amazing rate...) I tried setting up mod_proxy_connect on top of mod_ssl, with the idea that I could send a CONNECT localhost:22 HTTP/1.1 request through HTTPS, and then I'd be all set. Sadly, this seems to not work; the HTTPS connection works, up until I finish sending my request; then SSL craps out. It appears as though mod_proxy_connect takes over the whole connection instead of continuing to pipe through mod_ssl, confusing the heck out of the HTTPS client. Is there a way to get this to work? I don't want to do this over plain HTTP, for several reasons: Leaving a big fat open proxy like that just stinks A big fat open proxy is not good over HTTPS either, but with authentication required it feels fine to me HTTP goes through a proxy -- I'm not too concerned about my traffic being sniffed, as it's ssh that'll be going "plaintext" through the tunnel -- but it's a lot more likely to be mangled than HTTPS, which fundamentally cannot be proxied Requirements: Must work over port 443, without disturbing other HTTPS traffic (i.e. I can't just put the ssh server on port 443, because I would no longer be able to serve pages over HTTPS) I have or can write a simple port forwarder client that runs under Windows (or Cygwin) Edit DAG: Tunnelling SSH over HTTP(S) has been pointed out to me, but it doesn't help: at the end of the article, they mention Bug 29744 - CONNECT does not work over existing SSL connection preventing tunnelling over HTTPS, exactly the problem I was running into. At this point, I am probably looking at some CGI script, but I don't want to list that as a requirement if there's better solutions available.

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  • Detecting dead proxies

    - by Afnan
    Is it possible to detect which proxy is active which is dead? using c# and a combo box containing list of proxies with port number is there any way we take every proxy one by one and determine as if it was dead or active? Microsoft.Win32.RegistryKey registry = Microsoft.Win32.Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings", true); registry.SetValue("ProxyEnable", 1); registry.SetValue("ProxyServer", comboBox1.Text) ;

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  • How to handle requsts from IIS to Apache?

    - by omoto
    Hi all! I need to create something like proxy between IIS and Apache So hostheaders I would like to set up on IIS because it's Windows 2003 Server but I have some applications that should be hosted under Apache. In this case I think that I should set up something like proxy... Any ideas?

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  • Setting custom SQL in django admin

    - by eugene y
    I'm trying to set up a proxy model in django admin. It will represent a subset of the original model. The code from models.py: class MyManager(models.Manager): def get_query_set(self): return super(MyManager, self).get_query_set().filter(some_column='value') class MyModel(OrigModel): objects = MyManager() class Meta: proxy = True Now instead of filter() I need to use a complex SELECT statement with JOINS. What's the proper way to inject it wholly to the custom manager?

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