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• iptables: built-in INPUT chain in nat table?

  - by ughmandaem

  I have a Gentoo Linux system running linux 2.6.38-rc8. I also have a machine running Ubuntu with linux 2.6.35-27. I also have a virtual machine running Debian Unstable with linux 2.6.37-2. On the Gentoo and Debian systems I have an INPUT chain built into my nat table in addition to PREROUTING, OUTPUT, and POSTROUTING. On Ubuntu, I only have PREROUTING, OUTPUT, and POSTROUTING. I am able to use this INPUT chain to use SNAT to modify the source of a packet that is destined to the local machine (imagine simulating an incoming spoofed IP to a local application or just to test a virtual host configuration). This is possible with 2 firewall rules on Gentoo and Debian but seemingly not so on Ubuntu. I looked around for documentation on changes to the SNAT target and the INPUT chain of the nat table and I couldn't find anything. Does anyone know if this is a configuration issue or is it something that was just added in more recent versions of linux?

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• To change the cache time of arp table

  - by el-mfd

  How do I change the cache time for updating arp table?

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• I need some MySQL lookup table advice

  - by Gary Beam

  I have a MySQL database with about 200 tables. 50 of these are small 2-field 'id-data' lookup tables. Several of these DB's are hosted on a shared server. I have been informed that I need to reduce the total number of tables in the shared hosting environment because of performance issues relating to too many tables. My question is: Could/Should the 50 2-Field lookup tables be combined into a single 3-field table with 'id-field_name-data' Fields? Even if this can be done, I will have a lot of work to do on the PHP user application. My other choice is moving the DB's to a dedicated server at much higher hosting cost. I don't believe my 200 table DB's are actually causing any performance issues on this shared hosting server, at least not from the user application standpoint. There are never more than 10 of these tables joined in any single query; although I have seen some very-slow queries generated by phpmyadmin on these DB's.

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• dns ptr entry table

  - by mhay

  what file shall touch to update ptr entry table ? thanks

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• Routing table with two NIC adapters in libvirt/KVM

  - by lzap

  I created a virtual NAT network (192.168.100.0/24 network) in my libvirt and new guest with two interfaces - one in this network, one as bridged (10.34.1.0/24 network) to the local LAN. The reason for that is I need to have my own virtual network for my DHCP/TFTP/DNS testing and still want to access my guest externally from my LAN. On both networks I have working DHCP, both giving them IP addresses. When I setup NAT port forwarding (e.g. for ssh), I can connect to the eth0 (virtual network), everything is fine. But when I try to access the eth1 via bridged interface, I have no response. I guess I have problem with my routing table - outgoing packets are routed to the virtual NAT network (which has access to the machine I am connecting from - I can ping it). But I am not sure if this setup is correct. I think I need to add something to my routing table. # ifconfig eth0 Link encap:Ethernet HWaddr 52:54:00:B4:A7:5F inet addr:192.168.100.14 Bcast:192.168.100.255 Mask:255.255.255.0 inet6 addr: fe80::5054:ff:feb4:a75f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:16468 errors:0 dropped:27 overruns:0 frame:0 TX packets:6081 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:22066140 (21.0 MiB) TX bytes:483249 (471.9 KiB) Interrupt:11 Base address:0x2000 eth1 Link encap:Ethernet HWaddr 52:54:00:DE:16:21 inet addr:10.34.1.111 Bcast:10.34.1.255 Mask:255.255.255.0 inet6 addr: fe80::5054:ff:fede:1621/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:34 errors:0 dropped:0 overruns:0 frame:0 TX packets:189 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4911 (4.7 KiB) TX bytes:9 # route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.34.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 1002 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth1 0.0.0.0 192.168.100.1 0.0.0.0 UG 0 0 0 eth0 Network I am trying to connect from is different than network the hypervisor is connected to: 10.36.0.0. But it is accessible from that network. So I tried to add new route rule: route add -net 10.36.0.0 netmask 255.255.0.0 dev eth1 And it is not working. I thought setting correct interface would be sufficient. What is needed to get my packets coming through?

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• transfer code from one server to other server.

  - by Kamlesh Bhure

  I wanted to transfer new code into my new production server. I have code files on my development server. Instead of uploading files using FTP from my local machine, there is other way to transfer code from one server to other. What I am thinking I will make zip file of whole code to be transfer and place it in webroot. So that it would be accessible in internet with some link http://www.mydomain.com/code.tar.gz now on the other server i will just run command wget http://www.mydomain.com/code.tar.gz Will this transfer done in few seconds...? May I know is this correct approach?

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• How can I generate a list of appendices with LaTeX, seperate from table of contents (toc)

  - by None

  LaTeX' appendix environment formats sections differently and uses a different enumeration in the table of contents: \begin{appendix} \section{superuser} \dots{} .... Shows up as       A       superuser            11 in the \tableofcontents. Unfortunately, I have to use a different style: the appendix is not to show up in the table of contents, but in a seperate listing right before the appendix. I see the following options to solve this: suppress output in tableofcontents and somehow recreate the part on a different page generate a custom listing of specified / the following section manually create a list with the same formatting of the tableofcontents I use scrartcl as document class. PS: appedix / appendices is not a tag yet

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• Word table copy/drag formulae like Excel

  - by tumchaaditya

  I am inserting formulae into a word table to get subtotals for rows and columns and a grand total. My problem is, I have got large number of rows and I don't want to enter the formulae manually in each cell. I cannot use =SUM(LEFT) because the subtotal does not have all the columns. So, is there any way to drag the formulae like we do in excel(bottom right corner of selected cell)? I cannot send the table to excel and copy it back because it would ruin the formatting which took a lot of my time.

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• Powershell access a single value in a table

  - by falkaholic

  this should be a really easy one but i can't seem to find an easy way. For example, in powershell and am using a CSV file, which is then used to look up some configuration data based on an ID. Here is what I have now, it works, but there has got to be a better way. $configList = import-csv "C:\myconfig.csv" $id = "5001" $configList | where-object {$_.id -eq $id} | foreach-object{ $configData = $_.configData} If use format-table etc, I always get the column header, which I would then have to cut off. Again, this has got to be really easy and this isn't a show stopper. But there has to be a better way to get just the data out of a table without the column header.

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• Clean out a large MediaWiki text table

  - by Bart van Heukelom

  I just discovered that an old MediaWiki of mine was infested with spam, and the database table named "text" (which contains the page content) is 3GB large. I've deleted all the spam pages manually, but: The table is still the same size. I wonder how it got to 3GB anyway. There wasn't that much spam (about a hundred medium-sized pages) How can I get rid of this mess? If you want to inspect the wiki, it's over here. The database is MySQL 5.0.75.

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• Filemaker show total from related table

  - by Mr_Chimp

  I have a bit of experience with Access and SQL but I'm new to Filemaker. I have a layout which shows a list of projects. One of the fields I want it to show is "total amount of paid invoices up to the end of the last financial year". The invoices are stored on another table so I will need to pick from this table all records where "project id" = "project id" (this is set up as a relationship between the tables) and also "invoice is paid" = yes AND "date invoice paid" < start of last financial year. My question is how do I go about getting and showing that data? I can get a total easily enough, it's filtering out these specific rows that I'm having trouble with. I'm guessing there's an easy solution...

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• How to lookup a value in a table with multiple criteria

  - by php-b-grader

  I have a data sheet with multiple values in multiple columns. I have a qty and a current price which when multiplied out gives me the current revenue (CurRev). I want to use this lookup table to give me the new revenue (NewRev) from the new price but can't figure out how to do multiple ifs in a lookup. What I want is to build a new column that checks the "Product", "Tier" and "Location/State" and gives me the new price from the lookup table (above) and then multiply that by the qty. e.g. Data > Product, Tier, Location, Qty, CurRev, NewRev > Product1, Tier1, VIC, 2, $1000.00, $6000 (2 x $3000) > Product2, Tier3, NSW, 1, $100.00, $200 (1 x $200) > Product1, Tier3, SA, 5, $250.00, $750 (5 x $150) > Product3, Tier1, ACT, 5, $100.00, $500(5 x $100) > Product2, Tier3, QLD, 2, $150.00, $240 (2 x $240) Worst case, if I just get the new rate I can create another column

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• Table Formatting in Word

  - by user359217

  I have a table in Word which is 5 columns wide and multiple rows. In Row 3, cells 1, 2, 3 & 5 have simple text. Cell 4 contains a large quantity of text and therefore needs to wrap over several pages. Therefore, I mark "Allow row to break across pages". Problem: on next page where row has wrapped, cells 1, 2, 3 & 5 are blank with cell 4 displaying the wrapped text. Is there any way that I can get the simple text from Row 3, cells 1, 2 and 3 to repeat on the pages which contain the wrapped text of cell 4? I do not want the data to be in the table heading, as I have multiple rows which have a similar volume of text.

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• CodeIt.Right Code File Header Template For StyleCop Rules

  - by Paulo Morgado

  I like to use both StyleCop and CodeIt.Right to validate my code – StyleCop because it’s free and CodeIt.Right because it’s really good. While StyleCop provides only validation, CodeIt.Righ provides both validation and correction of violations. Unfortunately, CodeIt.Right’s supplied template for code file headers does not conform to StyleCop rules. Fortunately, CodeIt.Right allows us to define our own template. Here’s the one I use: <#@ template language="C#" #> //----------------------------------------------------------------------- // <copyright file="<#= System.IO.Path.GetFileName(Context.DestinationFile) #>" // project="<#= Context.ProjectName #>" // assembly="<#= Context.AssemblyName #>" // solution="<#= Context.SolutionName #>" // company="<#= Context.GetGlobalProperty("CompanyName") #>"> // Copyright (c) <#= Context.GetGlobalProperty("CompanyName") #>. All rights reserved. // </copyright> // <author id="<#= Context.GetGlobalProperty("UserID") #>"><#= Context.GetGlobalProperty("UserName") #></author> // <summary></summary> //-----------------------------------------------------------------------

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• AutoScroll panel working intermittently.

  - by Edward Boyle

  I spent hours last week trying to get AutoScroll to function properly on a derived/inherited panel control I have been writing. I found no answers on my own so I posted to several forums and move onto other code while I wait for a reply. Then out of nowhere, it started working properly. Now, Today (about a week later) I notice it is no longer working again!  I go back to those old posts with hopes I will find an answer – No such luck. I Google for about two hours reading everything I come across. I was just about to write a new custom control from the ground up, perhaps use a little unmanaged code to force things to function properly. All I knew was “options in front of me = dealys”.  Just before I gave up, my head in my hands,  Jordan Sirwin’s appropriately titled blog post: “C#: Windows Panel AutoScroll Bug / Intended Suckyness” saves the day! In order for scroll bars to display, there must be at least one control in the Panel with AutoSize set to true. This is absurd… I’m not sure if this is a bug or intended, but it’s stupid. –I feel your pain. How many others have spent hours on this, or worse,  just plain given up? I want those hours back Damnit!

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• Twin Cities Code Camp 8 Retrospective

  - by Lee Brandt

  I just got back (a few hours ago) from Minneapolis, where I was speaking at the Twin Cities Code Camp 8. I’d never been to a Twin Cities Code Camp, and I have always heard such great things, so I submitted and got accepted to speak. The conference (what I got to see) was great. My talk was pretty short on people, but there are many reasons for that. First, I spoke opposite Donn Felker (speaking about developing for Android) and Keith Dahlby (speaking about Dynamic .NET). So of course, my talk is going to be empty. How could I compete with that? Plus, my talk was about software process improvement, specifically about how our process has evolved. Maybe not the smartest idea to submit to talk about software process at a developer’s conference. The people who DID attend however, seemed to really enjoy the talk. There was good interaction and good, thoughtful questions. So the attendees seemed engaged. I actually did get a chance to go to one session. I went and saw Javier Lozano talk about Open source tools for ASP.NET MVC. I am hip-deep in MVC stuff right now and getting up to speed on MVC 2 as well. I learned about MVC Turbine, Javier’s Open Source project. I will definitely be adding it to my MVC arsenal. Thanks Javier! I did forget my AC adapter for my laptop and got a little lost in Minneapolis on my way to get one from MicroCenter Saturday morning, but other than that, it was a great trip. It’s a long drive, but seeing all the guys and getting two Nut & Honey rolls from Roly Poly in Eden Prarie for lunch on Saturday made the trip totally worth it. I look forward to seeing what Jason & Chris come up with for next year! Thanks for having me guys!

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• Java Road Trip: Code to Coast

  - by Tori Wieldt

  tweetmeme_url = 'http://blogs.oracle.com/javaone/2010/06/java_road_trip_code_to_coast.html'; Share .FBConnectButton_Small{background-position:-5px -232px !important;border-left:1px solid #1A356E;} .FBConnectButton_Text{margin-left:12px !important ;padding:2px 3px 3px !important;} The Java Road Trip: Code to CoastJava developers, architects, programmers, and enthusiasts: get ready for a real adrenaline rush! Follow the Java Road Trip: Code to Coast as this high-tech block party on wheels travels to 20 cities across the United States showcasing Oracle's commitment to everything Java. It's a chance to talk to Java leaders and engineers and get your hands on the latest Java technology. The Java Road Trip kicks off June 14 in New York City with Octavian Tanase, Vice President, Java Platform Group at Oracle, headlining the event. Don't miss    EJBs in Boston!    Governance in Washington, DC!    Swing(ing) in Memphis!    Mile-high UIs in Denver!    Java in Seattle! (too easy)     and more!Join or follow the tour here: http://java.com/roadtrip/Read the Oracle Magazine articleUse or follow the hash tag #javaroadtrip

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• Printing problem in Silverlight 4.0 RC - loading images in code behind

  - by Jacek Ciereszko

  Few days ago I faced a problem with printing in new Silverlight 4 RC. When you try to dynamically load image (in code behind) and print it, it doesn't work. Paper sheet is blank. Problem XAML file: <Image x:Name="image" Stretch="None" /> XAML.cs: image.Source = new BitmapImage(new Uri(imageUri, UriKind.RelativeOrAbsolute));  Print: var pd = new PrintDocument();   pd.PrintPage += (s, args) =>     {       args.PageVisual = image;     };   pd.Print(); Result: Blank paper.   Solution What you need to do, is forced Silverlight engine to load that image before printing start. To accomplish that I proposed simply checking PixelWith value. Your code will ask about PixelWidth of image so it will have to be loaded. XAML.cs: BitmapImage bImage = new BitmapImage(new Uri(imageUri, UriKind.RelativeOrAbsolute)); image.Source = bImage; InitControl(imageUri, movieUri, isLeft); int w = bImage.PixelWidth; int h = bImage.PixelHeight;   DONE!   Jacek Ciereszko

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• Clean URLs issue using .htaccess in PHP project

  - by x4ph4r

  I am working on a PHP laravel project. I am currently facing issues with .htaccess file. I have following .htaccess: <IfModule mod_rewrite.c> Options -MultiViews RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^ index.php [L] </IfModule> When I reload my page the it gave me following error: 404 Not Found The requested URL /contacts was not found on this server. Then I opened /etc/apache2/users/username.conf file which had following line of code: <Directory "/Users/username/Sites/"> Options Indexes MultiViews AllowOverride None Order allow,deny Allow from all </Directory> In above code I changed AllowOverride None to AllowOverride All. Then I reload page and got following error: 403 Forbidden You don't have permission to access /contacts on this server. When I add FollowSymLinks to .htaccess file Options such as like this Options -MultiViews FollowSymLinks. Then sometimes I get this 500 Internal Server Error error and sometime this *Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data*. Each time I reload my page one of these errors with FollowSymLinks option. I also uncomment following lines in /etc/apache2/httpd.conf: LoadModule rewrite_module libexec/apache2/mod_rewrite.so LoadModule php5_module libexec/apache2/libphp5.so and still I am getting same permission denied error. Please help me I am trying to solve this problem for past 3 days but it is till unresolved.

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• How best to handle ID3D11InputLayout in rendering code?

  - by JohnB

  I'm looking for an elegant way to handle input layouts in my directx11 code. The problem I have that I have an Effect class and a Element class. The effect class encapsulates shaders and similar settings, and the Element class contains something that can be drawn (3d model, lanscape etc) My drawing code sets the device shaders etc using the effect specified and then calls the draw function of the Element to draw the actual geometry contained in it. The problem is this - I need to create an D3D11InputLayout somewhere. This really belongs in the Element class as it's no business of the rest of the system how that element chooses to represent it's vertex layout. But in order to create the object the API requires the vertex shader bytecode for the vertex shader that will be used to draw the object. In directx9 it was easy, there was no dependency so my element could contain it's own input layout structures and set them without the effect being involved. But the Element shouldn't really have to know anything about the effect that it's being drawn with, that's just render settings, and the Element is there to provide geometry. So I don't really know where to store and how to select the InputLayout for each draw call. I mean, I've made something work but it seems very ugly. This makes me thing I've either missed something obvious, or else my design of having all the render settings in an Effect, the Geometry in an Element, and a 3rd party that draws it all is just flawed. Just wondering how anyone else handles their input layouts in directx11 in a elegant way?

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• Is this kind of design - a class for Operations On Object - correct?

  - by Mithir

  In our system we have many complex operations which involve many validations and DB activities. One of the main Business functionality could have been designed better. In short, there were no separation of layers, and the code would only work from the scenario in which it was first designed at, and now there were more scenarios (like requests from an API or from other devices) So I had to redesign. I found myself moving all the DB code to objects which acts like Business to DB objects, and I've put all the business logic in an Operator kind of a class, which I've implemented like this: First, I created an object which will hold all the information needed for the operation let's call it InformationObject. Then I created an OperatorObject which will take the InformationObject as a parameter and act on it. The OperatorObject should activate different objects and validate or check for existence or any scenario in which the business logic is compromised and then make the operation according to the information on the InformationObject. So my question is - Is this kind of implementation correct? PS, this Operator only works on a single Business-wise Operation.

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• Improving the speed of writing code in C#

  - by Robert Harvey

  Laugh if you want, but I used to develop substantial line-of-business applications in VB6, long before the .NET framework came along. Why, when I was your age, we used to walk two miles in the snow, uphill. Both ways... Love it or hate it, VB6 had a REPL-like feel, and a very rapid development cycle. I would like to know how to come closer to that process in C#. In VB6, I could write a function, execute it, debug it and have it fully functional in a few minutes. I am told this is how the Lisp crowd works. It's a very rapid-fire style of programming. In C# I write a function, then I write a unit test for that function (which is OK, I understand the value of that), then I right-click, run test, wait for the project to compile (takes about 10 seconds right now, which would be an eternity for a REPL loop), and get an exception. Honestly, this feels more like my junior college days, when I used to feed punch cards into a hopper and wait for a printout (exaggerating only slightly for effect). Additionally, my tendency nowadays is to make everything public while I'm testing it. Unit testing with private accessors works fine, but you can't trace through the code (unless, of course, I'm doing something wrong) while you're using them. So what I'd like to know is, what adjustments have you made to your development process in C# to streamline it, and make it possible to write and verify your code very rapidly?

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• Google analytics iframe code measuring visitor as two visitors

  - by Maarten

  I'm trying to measure visitors in an iframe and the site containing the iframe. What I would like is that visitors clicks in the iframe are seen being from the same visitor as the containing site, but somehow it is seen as two seperate visitors. I followed examples from http://www.blastam.com/blog/index.php/2011/02/google-analytics-cross-domain-tracking/, trimmed down to an even simpler version based on the comments about setDomainName not being needed anymore but with setDomainName I get the same result: a click on a page and a click on the iframe is seen as 2 clicks by 2 seperate visitors. This is the code in my iframe if (_gaq && gaAccount.length > 0){ _gaq.push(['_setAccount', gaAccount]); _gaq.push(['_setAllowLinker', true]); //_gaq.push(['_setDomainName', 'none']); _gaq.push(['_trackPageview', 'mytestcountername']); } And this is the code in the containing page: <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-9605474-4']); _gaq.push(['_setAllowLinker', true]); //_gaq.push(['_setDomainName', '.domain.nl']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); </script>

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• Unit and Integration testing: How can it become a reflex

  - by LordOfThePigs

  All the programmers in my team are familiar with unit testing and integration testing. We have all worked with it. We have all written tests with it. Some of us even have felt an improved sense of trust in his/her own code. However, for some reason, writing unit/integration tests has not become a reflex for any of the members of the team. None of us actually feel bad when not writing unit tests at the same time as the actual code. As a result, our codebase is mostly uncovered by unit tests, and projects enter production untested. The problem with that, of course is that once your projects are in production and are already working well, it is virtually impossible to obtain time and/or budget to add unit/integration testing. The members of my team and myself are already familiar with the value of unit testing (1, 2) but it doesn't seem to help bringing unit testing into our natural workflow. In my experience making unit tests and/or a target coverage mandatory just results in poor quality tests and slows down team members simply because there is no self-generated motivation to produce these tests. Also as soon as pressure eases, unit tests are not written any more. My question is the following: Is there any methods that you have experimented with that helps build a dynamic/momentum inside the team, leading to people naturally wanting to create and maintain those tests?

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• Caching strategies for entities and collections

  - by Rob West

  We currently have an application framework in which we automatically cache both entities and collections of entities at the business layer (using .NET cache). So the method GetWidget(int id) checks the cache using a key GetWidget_Id_{0} before hitting the database, and the method GetWidgetsByStatusId(int statusId) checks the cache using GetWidgets_Collections_ByStatusId_{0}. If the objects are not in the cache they are retrieved from the database and added to the cache. This approach is obviously quick for read scenarios, and as a blanket approach is quick for us to implement, but requires large numbers of cache keys to be purged when CRUD operations are carried out on entities. Obviously as additional methods are added this impacts performance and the benefits of caching diminish. I'm interested in alternative approaches to handling caching of collections. I know that NHibernate caches a list of the identifiers in the collection rather than the actual entities. Is this an approach other people have tried - what are the pros and cons? In particular I am looking for options that optimise performance and can be implemented automatically through boilerplate generated code (we have our own code generation tool). I know some people will say that caching needs to be done by hand each time to meet the needs of the specific situation but I am looking for something that will get us most of the way automatically.

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