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• What are some good, IP Address Management solutions for IPv6? [closed]

  - by Russell Heilling

  There are a number of open source IPAM tools available for IPv4 address management; however there seems to be a distinct lack of actively updated tools available for IPv6. Other than FreeIPdb (code no longer maintained) or the RIPE Database (I have seen some customisations to the RIPEdb that allow for enterprise/ISP IPAM but it seems like overkill for a system that will probably only ever handle one /32 worth of space). Are there any other options that I'm missing? (Database only please. I know vi can be used for flat text IPAM, that's how I'm handling our /32 at the moment, but I don't see it scaling for much longer) It doesn't have to be open source but what are folks doing to manage IPv6 in a dual stack environment

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• How can I use an SSH tunnel for all traffic from a single application, without knowing the ports used?

  - by Matthew Read

  I have an application that opens connections on dozens of ports, and doesn't provide documentation about which ports it uses. I could use Wireshark or something to capture the traffic and export the ports from that, but I think it should be simpler than that. (And I'm not sure I would be able to cover all use cases and ensure the app used every single port it can ever use.) So I'm looking for a way to just say "forward all traffic from this application" (bonus points for all traffic from child processes as well) without needing to worry about specific ports. I'm sure there must be a way, but I couldn't hit on the right keywords while searching Google. How can I do this?

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• How does MySQL 5.5 and InnoDB on Linux use RAM?

  - by Loren

  Does MySQL 5.5 InnoDB keep indexes in memory and tables on disk? Does it ever do it's own in-memory caching of part or whole tables? Or does it completely rely on the OS page cache (I'm guessing that it does since Facebook's SSD cache that was built for MySQL was done at the OS-level: https://github.com/facebook/flashcache/)? Does Linux by default use all of the available RAM for the page cache? So if RAM size exceeds table size + memory used by processes, then when MySQL server starts and reads the whole table for the first time it will be from disk, and from that point on the whole table is in RAM? So using Alchemy Database (SQL on top of Redis, everything always in RAM: http://code.google.com/p/alchemydatabase/) shouldn't be much faster than MySQL, given the same size RAM and database?

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• does it still have any sense to directly drop mails that trigger RBLs?

  - by Luke404

  Once upon a time, using RBLs to drop mails was actually a good idea. These days seems it is no more possible for a reason or the other, so every one switched / is_switching to just use RBLs as another test in score based antispam solutions (read: SpamAssassin & friends). This gives good results, but neglects one of the benefits of RBLs, namely the ability to reject (supposed) spam before even receiving the message body. Is still there any RBL that makes sense to use that way, to hardly reject anything that fires a match in that list? If there are people doing it that way, do you ever get false positives due to the list?

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• Performance improvements of VBulletin by integrating the plugins

  - by reggie

  I have amassed quite a lot of plugins and code that is being hooked into VBulletin's plugin system. There are good uses for this system. But since I am now locked in with the VB 3 branch and it is no longer updated, I wonder what kind of performance improvements I would see if I integrated all the plugins into the vbulletin files and turned the plugin system completely off. My site has about 1.5 mio posts, about 100,000 threads, 100,000 members (of which 10,000 are "active"). I estimate I have about 200 plugins from different products in the plugin manager. Has anybody ever tried this move and could share the experiences?

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• Trying to make changes to the size of the events buffer in prelude-ids auditd plugin

  - by tharris

  I am running systems using the prelude-ids plugin for auditd. When the manager is up every thing works fine however I have a requirement that when the clients can't talk to the manager they should store no more than 250MB of messages, and when they hit that point they should start deleting the oldest events. All I can find is that audispd can be set to an overflow action of ignore,syslog,suspend,single, and halt none of which meet my requirement, and several of which I really cannot use. Does anyone know a way to do this? I know the events get stored in /var/spool/prelude/auditd/global, but I can't find anything about configuring how things are stored here. There are usually several files in the global directory but only 2 of them ever go above 0 in size, data0 and data0.journal.

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• How long will the serial port be around for?

  - by Andy

  It seems that the serial port has a remarkable ability to stick around. You might call it the hardware equivalent of Windows XP. Despite pretty much physically disappearing from laptops and the like, the need to use a serial port still exists, even if it means using a converter of some sort. It is very much a legacy piece of hardware, and yet so many devices and instruments still use it. I use it myself daily in my work with PLC's, HMI's, barcode readers, etc. In my opinion, I don't think it is going anywhere soon, but how long do you think it has got before joining the museum? Do you think it ever will?

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• How measure Web App performance ?

  - by xRobot

  I have developed 3 simple blogging system in PHP/Apache/Mysql, Python/Ngix/Postgresql and in Erlang/Yaws/Mnesia. How can I measure performance on my server for this 3 different configuration ?

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• Windows 7 just corrupted Microsoft F# and now won't fix itself.

  - by user225626

  I lost half a year's worth of custom CGAL/GMP/LEDA/Qt3/Qt4/MPFR/MPFI/Visual Studio/Boost/blahblahblah open source nonsense with DLLs that are scattered in various parts of the OS that I had gotten to finally work. All because F#, which came with .NET 4 and which I never, ever used, is now "corrupted" one day for reasons only Windows 7 knows, and now Windows 7 won't even boot. Of course none--none--of the above setup works as accessed from the USB port. How do I remove a corrupted file that prevents a Windows 7 from booting, or even being fixed by an external CD mount of the Windows 7? Thanks for any help.

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• What features would you like to see added to C++?

  - by George Edison

  Are there any features you would like to see added to C++? Maybe... A programming construct An extra operator A built-in function you think would be useful I realize questions like this are frowned upon, but I think this one is a genuine programming question that can be answered and the answers will spawn valuable discussion. (And it's community wiki.) Here is one of mine: How come C++ has no exponent operator, like Python's **?

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• [Django] How to post to a facebook page

  - by patrick

  Hi! I need to post a status update of one of my facebook page when I create a model into my django project, but I don't know how to do it using the new facebook graph api: http://github.com/facebook/python-sdk/blob/master/src/facebook.py can you explain to me how to do it? Thanks in advance :)

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• Alternative to the tee command whitout STDOUT

  - by aef

  I'm using | sudo tee FILENAME to be able to write or append to a file for which superuser permissions are required quite often. Although I understand why it is helpful in some situation, that tee also sends its input to STDOUT again, I never ever actually used that part of tee for anything useful. In most situations, this feature only causes my screen to be filled with unwanted jitter, if I don't go the extra step and manually silence it with tee 1> /dev/null. My question: Is there is a command arround, which does exactly the same thing as tee, but does by default not output anything to STDOUT?

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• Macro is not Cooperating with Quotations in Excel VBA

  - by B-Ballerl

  I Have a macro containing a line that will change the formula of a cell using R1C1 formula type. The formula is: ActiveCell.FormulaR1C1 = _ "=IF(R[0]C[-2]=0,"",(R[0]C[-20]-R[0]C[-16]))" When ever I attempt to run the macro it always comes up with a dialog box saying Run-time error '1004': Application-defined or object-defined error. And when you click debug it highlights those 2 lines in the macro. And I can't figure out how to fix it. Can anyone help?

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• Dynamic Disk: Revert back to basic or...?

  - by someguy

  When I was trying to create a new partition (via Disk Management) it warned me that the disk would be dynamic, but I thought it meant the partition and went ahead. Now, my hard disk, which has the main C partition, is dynamic. I haven't shut down the computer, and I'm not sure what the consequences are. Should I revert back to basic or...? What ever happens, I don't want to lose my data. Edit: I think I should mention that I don't know how to revert back to basic...

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• Hidden features of Clojure

  - by danlei

  Which lesser-known but useful features of Clojure do you find yourselves using? Feel free to share little tricks and idioms, but try to restrict yourselves to Core and Contrib. I found some really interesting information in answers to these similar questions: Hidden features of Haskell Hidden features of Python Hidden features of Java Hidden features of C There are many more "Hidden feature" questions for other languages, so I thought it would be nice to have one for Clojure, too.

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• How do you manage updates without a staging environment: CentOS 6.3

  - by Gregg Leventhal

  I am managing about 20 servers, many of them virtual. They are almost all different purpose, and none are clustered. I have a distributed LAMP stack, a few application servers, some build servers, a few KVM hosts. They are CentOS 6.3 mostly with a few Ubuntu (unfortunately). I don't have the resources to setup a staging environment where I can have duplicates of my machines and test updates before rolling them out. I am taking file backups. What I want to know is how you are approaching backing up your Linux systems. I assume you don't just do yum update, but then how are you choosing the packages worthy of updating? When (if ever) are you updating the kernel, etc.. How do you test updates without a staging environment? Snapshot and hope for the best?

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• In general, do 3rd-party laptop AC adapters / chargers work reliably?

  - by MGOwen

  The AC adapters for my 2 dell laptops wore out very quickly. One supplies power but won't charge the battery (it's about 3 years old, the other is a bit newer). Both have worn through to the shielding around the notebook connector and look like they'll be unusable soon. Checking user reviews of the replacement adapter on Dell's own website, it appears they usually fail this fast. Apparently Dell does this deliberately to make money (their adapters sell for about 10-15 times what they cost to make). Same with replacement batteries. I can see there are plenty of much cheaper ($50 less) compatible AC adapters on eBay. Does anyone have experience with these? Naturally I'm nervous a crappy knock-off could fry my notebook, but has this ever actually happened to anyone recently? Has anyone had a good experience? Can anyone recommend a good online seller (who doesn't charge nonsensical shipping costs to Australia, preferably?)

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• How can I use linq to initialize an array of repeated elements?

  - by Eric

  At present, I'm using something like this to build a list of 10 objects: myList = (from _ in Enumerable.Range(0, 9) select new MyObject {...}).toList() This is based off my python background, where I'd write: myList = [MyObject(...) for _ in range(10)] Note that I want my list to contain 10 instances of my object, not the same instance 10 times. Is this still a sensible way to do things in C#? Is there a cost to doing it this way over a simple for loop?

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• How to troubleshoot memory card read?

  - by shinjin

  The built in memory card reader in my laptop mounts SD cards as read-only only. This happens both in Windows 7 and Ubuntu. Most of the time. Ever now an then it works. After a some non-deterministic combination of uninstalling/reinstalling/disabling/enabling of the driver with the mandatory reboots the card reader works for a while. Is there any sane way to troubleshoot if it's an actual hardware problem, or just a matter of drivers? I've tested it with several SD cards, that work just fine in other devices. System: Acer Aspire 8951G, Windows 7-64bit

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• Ubuntu Chromium bookmark icons blank

  - by Matt Parkins

  Ever so often I load Chromium and it refuses to load my profile. Now that doesn't happen any more but since then it refuses to load the icons for my bookmarks which, if you look at the attached pic, is my only way of identifying which icons do what (other than hover for tool-tip, or actually pressing the icon button). The other possible variable is that the bookmarks are meant to sync with Google sync - I'm not sure if that is a factor. How do I restore the icons to my bookmark bar? Chromium version: Version 20.0.1132.47 Ubuntu 12.04 (144678)

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• Volume randomly turning itself down on Windows 7 64-bit

  - by Arda Xi

  This is the weirdest issue I've ever encountered with my PC. Every so often, my sound will start playing back at a lower volume. This happens when watching video, listening to music, all independently. It usually lasts anywhere up to a minute, after which it will turn up again. The weird thing about it is that the volume control in Windows remains at 100%, even though the volume is audibly a lot lower. (No, I'm not going deaf, it's just my PC. I checked.) I just have no idea where to go to troubleshoot this, even. I'm using Windows 7 64-bit with an on-board Realtek sound-card. Oh, just in case someone finds this question on Google or whatever, making sure this is on Do Nothing may fix your problem. Unfortunately, it did not work for me. My settings all seem fine. This is my audio slider. (Took the screenshot while the issue showed.)

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• Horde on Debian: packages or upstream?

  - by fhd

  I'm currently using the Horde projects IMP, DIMP, MIMP, Ingo, Kronolith, Mnemo, Nag, Turba and Sork. I ignored the (rather outdated) Debian packages and installed the upstream versions. A few years later, my Horde installation is a bit outdated and I consider updating each project and each version individually a pain. The Debian stable packages are as outdated as ever, but squeeze will deliver reasonably current versions, so I'm considering switching to the Debian packages as soon as squeeze is released. What would you recommend for software packages like Horde? Using the upstream versions and manually updating or using the distribution's packages?

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• DVD player Ubuntu 9.10

  - by pcguynardone

  Hello everyone at SeverFault. I am new to this fourm. I have been using ubuntu since 8.04. Here is my problem. When I try to watch one of my cisco videos I get wmas error. I never had to use this format before. I went on ubuntu fourm they told me to use vlc media. I am using vlc media. mplayer, it still have error with that, sounds and video. Is there a program that I could use to watch wmas files on my ubuntu 9.10. It is a laptop ACer Extensa 5620z. Thank you for who ever will help !!

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• DVD player Ubuntu 9.10

  - by pcguynardone

  Hello everyone at SeverFault. I am new to this fourm. I have been using ubuntu since 8.04. Here is my problem. When I try to watch one of my cisco videos I get wmas error. I never had to use this format before. I went on ubuntu fourm they told me to use vlc media. I am using vlc media. mplayer, it still have error with that, sounds and video. Is there a program that I could use to watch wmas files on my ubuntu 9.10. It is a laptop ACer Extensa 5620z. Thank you for who ever will help !!

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• A complete tool for auditing and archiving emails would be helpful for the community?

  - by Renato Todorov

  Please, don't treat this like a discussion question, I'm looking for direct answers: Yes / No, because... I work on a financial company and I'm needing a tool for email archiving and auditing. The compliance sector is asking for it and I have to provide it. I've searched and found two solutions: MailStore (commercial, Windows only) and Enkive (open source, very poor UI and lack of features). I'm using Postfix as MTA and Courier for IMAP/POP access. I'm almost deciding to write it myself, I have the knowledge needed, but I'm wondering right now if it's worth to put (a lot) more hours to make it open source and user friendly. So my question is, have you ever had the same need? Would this be a helpful solution? Is there any other good tool that I haven't found? Thank you!

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