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• DNS pointing to different IPs from different parts of the world

  - by David

  I have a domain name that for some reason is pointing to different servers depending on where you are located in the world. What is odd is that I have another domain that has the same DNS servers, which points to the same server regardless of your location (which is the way it's mean't to work). Any ideas why the first domain is pointing to different IP addresses for different people?

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• are there any negative implications of sourcing a javascript file that does not actually exist?

  - by dreftymac

  If you do script src="/path/to/nonexistent/file.js" in an HTML file and call that in a browser, and there are no dependencies or resources anywhere else in the HTML file that expect the file or code therein to actually exist, is there anything inherently bad-practice about doing this? Yes, it is an odd question. The rationale is the developer is dealing with a CMS that allows custom (self-contained) javascript files to be provided in certain circumstances. The problem is the CMS is not very flexible when it comes to creating conditional includes for javascript. Therefore it is easier to just make references to the self-contained js files regardless of whether they are actually at the specified path. Since no errors are displayed to the user, should this practice be considered a viable option?

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• Difference and correct usage for /tmp and /var/tmp

  - by David

  I haven't put much thought into this until now, but it seems odd that there is a /var/tmp and /tmp directories for most of the linux distro's I routinely use ( Ubuntu, Centos, Redhat ). Is there any semantic difference between the two, like when whoever designed the first file system layout, he or she thought "Not all tmp file's are created equal!" The only difference I've found for centos, is that /tmp routinely scrubs out files older then 240 hours while /var/tmp holds onto stale files for 720 hours.

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• HP StorageWorks P4500 G2 Manager Management

  - by MDMarra

  According to the documentation, a management group should have an odd number of managers greater than 1. I have a four node SAN consisting of P4500 G2s. I plan on having two clusters with two nodes each in this management group, i.e.: -Managent_Group1 -Cluster1 -Node1 -Node2 -Cluster2 -Node3 -Node4 Are there any issues running standard managers on Node1, Node2, and Node3? After reading the documentation, I'm still unclear about whether or not cluster membership matters in quorum consistency, or if they don't matter at all.

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• Interface naming in Java

  - by Allain Lalonde

  Most OO languages prefix their interface names with a capital I, why does Java not do this? What was the rationale for not following this convention? To demonstrate what I mean, if I wanted to have a User interface and a User implementation I'd have two choices in Java: Class = User, Interface = UserInterface Class = UserImpl, Interface = User Where in most languages: Class = User, Interface = IUser Now, you might argue that you could always pick a most descriptive name for the user implementation and the problem goes away, but Java's pushing a POJO approach to things and most IOC containers use DynamicProxies extensively. These two things together mean that you'll have lots of interfaces with a single POJO implementation. So, I guess my question boils down to: "Is it worth following the broader Interface naming convention especially in light of where Java Frameworks seem to be heading?"

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• Possible capacitor plague - need help identifying

  - by cornjuliox

  I've been having some PC power issues lately, and I think I've tracked it down to a bad power supply. Lately, when I'm on my PC it will often restart without warning, displaying "Hypertransport sync flood error occurred last boot." once POST finishes. I've googled the error, but can't come to a definitive conclusion as to what's causing it. I've seen posts suggesting that it might be a power supply issue, but nothing conclusive. Here's what I've done so far: -I haven't installed anything suspect within the last 3 months. -I do overclock just a tiny bit, so I tried raising the voltages a little. That didn't work so I brought both CPU multiplier and voltages all back to their default settings, but that didn't solve the problem either. The problem still occurs. -AV scanned the whole system, nothing suspect. -I suspected that it might be a bad power supply so I cracked that open and found the following: I think it might be cap plague, but I'm not sure. It looks more like glue TBH. Could someone help me figure out what might be wrong with this PC? EDIT: Sometimes, after these restarts, I noticed that the GPU fan doesn't spin up, and the single rear case fan that just happens to be connected to the same molex Y-cable as the GFX card doesn't spin up either. Anything to that? EDIT 2: I do use the system quite heavily, but I don't know how that will factor into this. I often play Diablo 3 and EVE Online at the same time, frequently alt-tabbing between the two. I also have Firefox open in the background, sometimes with several tabs, and if I feel like it, I'll mute the in-game sound and open foobar2000 for better music. Could it be that I'm just pushing this thing too hard? EDIT 3: I also noticed something odd. Right before I experience these restarts, my monitor would suffer from very faint lines of static moving across the screen. The monitor is still very much useable, but it is very annoying. Following the restart it disappears, and then would gradually re-appear over the next few days, and then restarts again. I find it to be very odd. System specs for good measure: Orion 600 W PSU AMD Athlon II X3 440 (overclocked to 3.14 ghZ, raised the CPU multiplier to x13 from x10) MSI G40-775 motherboard 1 GB inno3D GTX 550 ti 4 GB DDR3 RAM 500 GB Samsung SATA HD

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• Index, assignment and increment in one statement behaves differently in C++ and C#. Why?

  - by Ivan Zlatanov

  Why is this example of code behaving differently in c++ and C#. [C++ Example] int arr[2]; int index = 0; arr[index] = ++index; The result of which will be arr[1] = 1; [C# Example] int[] arr = new int[2]; int index = 0; arr[index] = ++index; The result of which will be arr[0] = 1; I find this very strange. Surely there must be some rationale for both languages to implement it differently? I wonder what would C++/CLI output?

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• Only a Macs can connect to WIFI with WPA-Personal security on.

  - by jfar

  I have an odd issue with a Netgear WIFI router, 4 computers, 2 pc laptops with XP and 7 installed, one macbook pro and one older mac mini. With security off everything can connect to the wifi. With WPA-Security on only the macs can connect to the wifi. I've reset the Netgear router, done everything again from scratch, no deal. The PCs just can't connect.

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• Save open emails when exiting Outlook 2007?

  - by BigChief

  I use open emails as my todo list in Outlook 2007. For instance, when I look at my Inbox in the morning, I open all emails which I need to respond to, and throughout the day read, respond to and close each one. It's an odd system but it's how I manage my emails. Are there any addons available which will save open emails and reopen them if Outlook is restarted? I'm looking for behavior like Firefox's tabs, which will reopen each one if the process gets killed.

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• Static classes in PHP via abstract keyword?

  - by Boldewyn

  According to the PHP manual, a class like this: abstract class Example {} cannot be instantiated. If I need a class without instance, e.g. for a registry pattern: class Registry {} // and later: echo Registry::$someValue; would it be considered good style to simply declare the class as abstract? If not, what are the advantages of hiding the constructor as protected method compared to an abstract class? Rationale for asking: As far as I see it, it could a bit of feature abuse, since the manual refers to abstract classes more as like blueprints for later classes with instantiation possibility.

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• How do I revoke access to java applet on OSX when there's an error in the control panel.

  - by Marc Hughes

  I can't access the screenr.com java applet on my mac. Poking around the java preferences, I saw an odd entry with a red circle (I assume that means to deny access?) for it in the security section. When I highlight that entry and hit the remove button, I get an error, as seen in this screenshot: https://img.skitch.com/20110114-ktq714darqdckub92s3cqucr9s.jpg Is there somewhere I can go on the filesystem to clear out all of these? Other solution?

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• finger for Windows

  - by tearman

  Ok probably a bit of an odd question, but is there a way to enable "finger" like functionality on a Windows network? we'd basically like the ability to find out where a user is logged in on a network and possibly which users are logged onto a workstation if possible. We're currently on AD2003 functional level, with the intent of going to AD2008 very soon, so compatibility in that arena is preferable.

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• Any reason not to always log stack traces?

  - by Chris Knight

  Encountered a frustrating problem in our application today which came down to an ArrayIndexOutOfBounds exception being thrown. The exception's type was just about all that was logged which is fairly useless (but, oh dear legacy app, we still love you, mostly). I've redeployed the application with a change which logs the stack trace on exception handling (and immediately found the root cause of the problem) and wondered why no one else did this before. Do you generally log the stack trace and is there any reason you wouldn't do this? Bonus points if you can explain (why, not how) the rationale behind having to jump hoops in java to get a string representation of a stack trace!

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• problem with zsh interactive shell

  - by Jack

  When I use zsh in interactive mode, I get some glitches. This mainly happens when the command spills over onto a new line and I use backspace, with backspace leaving behind some glitches on the screen and moving the cursor to an odd position. It happens in a VT, in xterm and urxvt, although it is most noticeable with my chosen terminal, urxvt. When I use zsh as a login shell, it does not happen at all. What could be causing this?

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• Updating snort rules automatically

  - by Matt Simmons

  I've been working on getting my snort machine up and running, and working through Snort IDS and IPS Toolkit. The authors suggest using Oinkmaster, but on that website, the last update was February of 2008. That seems sort of...odd. Maybe there haven't been any issues with oinkmaster in the past year and a half, but it made me wonder if there was another solution that I don't know about. If you use snort, do you automatically update your rules, and if so, how?

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• Is there a standard practice for storing default application data?

  - by Rox Wen

  Our application includes a default set of data. The default data includes coefficients and other factors that are unlikely to ever change but still need to be update-able by the user. Currently, the original default data is stored as a populated class within the application. Data updates are stored to an external XML file. This design allows us to include a "reset" feature to restore the original default data. Our rationale for not storing defaults externally [e.g. XML file] was to minimize the risk of being altered. The overall volume of data doesn't warrant a database. Is there a standard practice for storing "default" application data?

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• Unsigned versus signed numbers as indexes

  - by simendsjo

  Whats the rationale for using signed numbers as indexes in .Net? In Python, you can index from the end of an array by sending negative numbers, but this is not the case in .Net. It's not easy for .Net to add such a feature later as it could break other code perhaps using special rules (yeah, a bad idea, but I guess it happens) on indexing. Not that I have ever have needed to index arrays over 2,147,483,647 in size, but I really cannot understand why they choose signed numbers. Can it be because it's more normal to use signed numbers in code?

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• Why is EventListenerList traversed backwards in fireFooXXX()?

  - by Joonas Pulakka

  I don't understand the rationale of this code, taken from javax.swing.event.EventListenerList docs: protected void fireFooXXX() { // Guaranteed to return a non-null array Object[] listeners = listenerList.getListenerList(); // Process the listeners last to first, notifying // those that are interested in this event for (int i = listeners.length-2; i>=0; i-=2) { if (listeners[i]==FooListener.class) { // Lazily create the event: if (fooEvent == null) fooEvent = new FooEvent(this); ((FooListener)listeners[i+1]).fooXXX(fooEvent); } } } Why is the list traversed backwards? Why is only every second listener called? The event firing is implemented exactly this way in javax.swing.tree.DefaultTreeModel among others, so it's obviously me who's just not getting something.

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• What's the easiest way to get an iPhone 3GS movie into iMovie?

  - by bpapa

  It seems like the steps right now are: Shoot movie sync iPhone with Mac via iTunes Open iPhoto Import photos from iPhone into iPhoto Open iMovie (or retart if it was already running) On startup, iMovie detects videos in iPhoto and imports them. Yikes. Is there an easier way? It's a bit odd that the videos are handled as photos, in the first place. And no, I'm not jailbreaking my iPhone simply to save me a few of these steps.

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• Boolean Not operator in VBScript

  - by Lumi

  Consider the following two conditionals (involving bitwise comparisons) in VBScript: If 1 And 3 Then WScript.Echo "yes" Else WScript.Echo "no" If Not(1 And 3) Then WScript.Echo "yes" Else WScript.Echo "no" Prints first yes, then no, right? cscript not.vbs Wrong! It prints yes twice! Wait a second, the Not operator is supposed to perform logical negation on an expression. The logical negation of true is false, as far as I know. Must I conclude that it doesn't live up to that promise? How and why and what is going on here? What is the rationale, if any?

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• Style question: Writing "this." before instance variable and methods: good or bad idea?

  - by Uri

  One of my nasty (?) programming habits in C++ and Java is to always precede calls or accesses to members with a this. For example: this.process(this.event). A few of my students commented on this, and I'm wondering if I am teaching bad habits. My rationale is: 1) Makes code more readable — Easier to distinguish fields from local variables. 2) Makes it easier to distinguish standard calls from static calls (especially in Java) 3) Makes me remember that this call (unless the target is final) could end up on a different target, for example in an overriding version in a subclass. Obviously, this has zero impact on the compiled program, it's just readability. So am I making it more or less readable? Related Question Note: I turned it into a CW since there really isn't a correct answer.

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• Reducing memory for worker MPM in Apache

  - by ShyM

  I've moved from the prefork MPM to the worker MPM due to a process limit I was hitting on my VPS. However, memory usage increased after switching over (which is odd since the worker MPM is supposed to have a smaller memory footprint?). Most of them belong to php-cgi processes. Is there something I'm doing wrong? I have around 20 sites on it, each with a different fcgi wrapper script. Could that be a reason?

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• cygwin + mintty + vim backspace problem

  - by overboming

  I have installed vim, mintty via cywin on XP. The problem is when I try to hit backspace in VIM edit mode, the cursor move back a character instead of wiping the previous char. How can I tweak this odd behavior?

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• Only Macs can connect to WIFI with WPA-Personal security on.

  - by jfar

  I have an odd issue with a Netgear WIFI router, 4 computers, 2 pc laptops with XP and 7 installed, one MacBook Pro and one older Mac mini. With security off everything can connect to the wifi. With WPA-Security on only the Macs can connect to the wifi. I've reset the Netgear router, done everything again from scratch, no deal. The PCs just can't connect.

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• Switches with large MAC address table?

  - by user1290200

  Does anyone know which switches have a large MAC address table ? I see most switches having only 8K, but we need to store way, way more than that (hundreds of K). I know this may seem odd, but trust me, there's no other way we can make our setup work. The only thing we seem to be able to do is install Juniper routers that store up to 1M addresses, but that will get quite costly and we'd rather avoid doing that.

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