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• Laptop sleep: How to go into S3 easily?

  - by monov

  Laptop: Fujitsu-Siemens Amilo Pi-3525 OS: Vista When my laptop is plugged in and I close the lid, it goes into S1 sleep. This means that there is still: fan noise (annoying when trying to sleep at night) lots of power consumed (so if I then unplug the laptop and toss it in the bag, by the time I'm at school it's already drained and beeping ominously). What I want is S3 sleep, it solves both problems. I've found a roundabout way to go into S3 sleep: Unplug laptop Close lid (or click Sleep in Start menu) Plug laptop back in if needed The question: How do I force Windows to use always use S3 sleep when I close the lid? One thing I've tried is: dumppo admin minsleep=s3 (dumppo from here) Afterwards running just dumppo admin confirms that minsleep has been set, but closing the lid still goes into S1. Also, after a reboot, minsleep is reset to s1. I think dumppo is incompatible with Vista... MCE Standby Tool was recommended as a Vista-compatible alternative to dumppo, but it doesn't have any effect either. I looked in the BIOS settings, but there are no settings relating to ACPI sleeps/suspends there.

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• How do you automatically close 3rd party applications when LiberKey is shut down?

  - by NoCatharsis

  Within LiberKey, I have added my own portable applications that are not included within the LiberKey library. When you go into the Properties menu for the app in the LiberKey UI, the Advanced tab has an option for Autoexecute. This dropdown menu seems to have no visible effect, at least on my current installation. I found that I could right click within the primary GUI and select "Add software group", add all 3rd party applications, then go to the Advanced tab within THAT Properties screen and select Autoexecute - "Always on startup". This solved the problem for starting the apps when LiberKey starts. However, now I'm having the same issue when closing out LiberKey. I have created a new 3rd party app that calls the same .exe, but sends the Parameter "/close". I then went to the Advanced tab and selected Autoexecute - "Always on shutdown". Seems pretty logical right? But the apps will not close on LiberKey shutdown. I cannot handle the app close-outs in the same way with a software group, as I did with the startup issue because the Autoexecute drop-down does not have an "Always on shutdown" option. Unfortunately, many of the Q&A forums on liberkey.com are in French and I took Spanish in high school. Otherwise I've not been able to find a workable answer. Any suggestions?

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• New hard drive for backup? [closed]

  - by glaeven

  I have come to realize that I need another external drive to use with my MacBook Pro. I currently have a 1TB WD MyBook Essential that I have been using for about a year and a half. I have it currently partitioned into two drives, one for backup (I named it Leonov) and one for movies, TV shows and other large files I don't need very often (I call that side Discovery One). I use Time Machine for backups since it is completely automated and I can restore from it without much trouble (I have had to at least three times now). As of now, Leonov is full enough that every backup deletes an old one and Discovery One is approaching it's limits. I would like to get a new drive and move one of the sides to it. What are some reliable, external (~1TB) drives for under or around $100? Would it be easier to move the movies (et al.) or the backups to the new drive? I also feel like I should say that all of my important documents (for school and the like, just not my music) are also synced to Dropbox as another form of backup and access.

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• Correct way to set up office network - 8 workstations, a file server and a staging server

  - by naunu

  Our office had this old school windows 2003 domain setup, our server caught fire, and now we are looking to do it right from scratch. Here is what we need: 5 PC and 3 Mac workstations for web development, they will each have WAMP/MAMP setup on them, managed by their developers. We will have a file server for assets, and a LAMP server with an external IP for staging. Here is what we have to work with: 5 IP addresses, brand new PC file server with windows 2008 SE, D-Link DSS-16+ 16 port switch, belkin 5 port wireless router, cable modem with 4 ports. How I have it set up now (this is a temporary makeshift setup): Cable modem = LAMP server, wireless router Wireless router = Switch = All of the workstations and file server (setup as a workgroup). We have noticed our internet is very slow with us all plugged in to the switch, and the switch plugged in to the router. I am not positive, but I think it is because our router does not have NAT. We are also having problems with the MACs connection to the network drive - it keeps disconnecting. I want this done right, and we have a ~$600 budget to buy anything else we need. Does anybody have any advice for me? Should I set up a domain or workgroup?

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• printing parallel over ethernet cable

  - by Crudler

  I have a bit of an interesting challenge :) I have a machine with a parallel printer output, i want it to be able to print instead to a printer in a different room and i know that parallel isnt great over big distances. i found this: http://www.amazon.com/over-Cat5-Extension-Cable-Adapter/dp/B002WJ9S6Y%3FSubscriptionId%3DAKIAINHICTCYYZGJWT4Q%26tag%3Dusbprintercables.net-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB002WJ9S6Y which will let me connect over cat5, but its usb to cat 5. my machine can only output on parallel (its not a computer) so what i was thinking of getting is a parallel(f) to usb and usb to parallel (M) for either side i.e. machine - parallel - usb - cat5 - usb - parallel -printer just seems a bit messy :) suggestions? another thing i would like to try is to get rid of the old school parallel printer and instead use a network based multi function. would this be possible? i.e. machine - parallel -usb - cat5 - ethernet print server - network printer this might be rougher because the machine cannot "know" that we are using a network printer. it can ONLY print to LPT1 Thanks!

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• Virtual Wifi Issue Windows 7

  - by Matt

  Lately I've been trying to use my laptop as a wireless router in my room. I have it connected to my school's network through ethernet, and I want to set up wireless so that I can use Wifi on my Android phone and iPod Touch. In the past, I used Connectify, but I started having an issue where my phone would find the network, connect, attempt to get the IP, and then suddenly the network would disappear. Then it'd pop up again, and the same process would happen over and over. I decided that I'd totally uninstall Connectify, but after that, neither Virtual Router Manager nor the command prompt could create a viable network either. My phone and even my iPod now encounter the same problem. Neither can successfully connect. So evidently there is something wrong with the laptop's virtual wifi feature, and I have no idea what that could be. I've tried enabling certain services that virtual wifi supposedly relies on, but some of them don't start, namely Remote Access Connection Manager. But I also have read that these enable on their own and that if they are normally not enabled it's fine. Furthermore, I even uninstalled and reinstalled the drivers for my wireless card. Any ideas as to why my virtual wifi won't function? Anything? I really would love to get this working...

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• How do I compile DarWINE in PowerPC Mac OS X 10.4.11...?

  - by Craig W. Davis

  So far I've tried using MacPorts which gives me this error: /Error: Cannot install wine for the arch(s) 'powerpc' because Error: its dependency pkgconfig is only installed for the archs 'i386 ppc'. Error: Unable to execute port: architecture mismatch To report a bug, etc... (I'm not allowed to post two links due to being a new poster...)./ I've also tried using the build script I found in the DarWINE 0.9.12 SDK download that I found on the DarWINE SourceForge.net Project Page... I've also tried the build script that I found at http://code.google.com/p/osxwinebuilder/#Building_Wine_via_the_script... None of these attempts to build DarWINE have actually worked. Whenever I build using the DarWINE build script I run it as follows: /1. I decompress the WINE tarball into ~/Downloads/WINE 2. I cd into ~/Downloads/DarWINE. 3. I run ./winemaker ~/Downloads/WINE/wine-1.2.2 or ./winemaker ~/Downloads/WINE/wine-1.2-rc2 (the reason for trying WINE 1.2-rc2 is that some people managed to get it to build on PowerPC Macs running 10.5.8...)./ I made sure to install Xcode Tools 2.5 & all the SDKs too... The net result is either a syntax type error resulting from trying to run the checked out Google Code DarWINE build script or a bunch of make errors when trying to run the official DarWINE build script that I forcefully extracted from the DarWINE 0.9.12 SDK .dmg file by using Pacifist. I trying to build DarWINE on mid-April 2006 1.42 GHz eMac with DL SuperDrive with Bluetooth 2.0+EDR with 2 GBs of RAM running 10.4.11 as I mentioned earlier... (it came with 10.4.4 on the Mac's Restore DVD-ROM that I ordered from 1-800-SOS-APPL & coconutIdentityCard told me it was made on April 12th 2006 & I know that's right because when I reinstalled Mac OS X 10.4.4 it displayed that it was registered/previously owned by a Hawaiian school...): /make[1]: winegcc: Command not found make[1]: * [main.o] Error 127 make: * [dlls/acledit] Error 2./

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• Mac OS X - configuring ntpd server with on LAN with D-Link DIR-655

  - by Mark C

  Hey all, This question is pretty specific, but I hope someone will have seen this error elsewhere. I a configuring a machine running OS X 10.5.8 to be an NTP server for machines connected to a LAN that is not connected to the Internet. I am not too worried about knowing the "right" time on all the machines, but rather worried about making sure everyone has the same notion of time. I configured the NTP daemon on Mac by turning on the Set date and time automatically in System Preferences, using the server's clock, 127.127.1.0 as the reference clock. I figured I should see if the server can NTP query itself before proceeding to the clients. The weird part is when I run the ntpq -p command in a command-prompt when connected to my D-Link DIR-655 (firmware: 1.33), it hangs for about a minute or so each time before finally giving me some output. I thought the problem might have to do with Port Forwarding, so I configured the router to forward port 123 for the IP of the server, but that did not improve the situation. When I run the ntpq -p command on my school's network, on a Linksys WRT54G router, or with the wireless Airport card turned off - I have absolutely no problems - the command returns a response instantly. Is this normal? I can see why a query might take a minute or so, but I don't understand why one router does it faster than the other. I tried messing around with the ntp.conf file adding the burst, minpoll, and maxpoll options: server 127.127.1.0 burst minpoll 4 maxpoll 5 Figuring that perhaps I am polling too often and the configuration file is slowing me down, but even with this, the ntpq still hangs on the D-Link DIR-655, but does just fine on the other routers. Any thoughts on where the lag is coming from or if the lag is even a problem?

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• How do I calculate clock speed in multi-core processors?

  - by NReilingh

  Is it correct to say, for example, that a processor with four cores each running at 3GHz is in fact a processor running at 12GHz? I once got into a "Mac vs. PC" argument (which by the way is NOT the focus of this topic... that was back in middle school) with an acquaintance who insisted that Macs were only being advertised as 1Ghz machines because they were dual-processor G4s each running at 500MHz. At the time I knew this to be hogwash for reasons I think are apparent to most people, but I just saw a comment on this website to the effect of "6 cores x 0.2GHz = 1.2Ghz" and that got me thinking again about whether there's a real answer to this. So, this is a more-or-less philosophical/deep technical question about the semantics of clock speed calculation. I see two possibilities: Each core is in fact doing x calculations per second, thus the total number of calculations is x(cores). Clock speed is rather a count of the number of cycles the processor goes through in the space of a second, so as long as all cores are running at the same speed, the speed of each clock cycle stays the same no matter how many cores exist. In other words, Hz = (core1Hz+core2Hz+...)/cores.

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• Cisco ASA 5510 Time of Day Based Policing

  - by minamhere

  I have a Cisco ASA 5510 setup at a boarding school. I determined that many (most?) of the students were downloading files, watching movies, etc, during the day and this was causing the academic side of our network to suffer. The students should not even be in their rooms during the day, so I configured the ASA to police their network segment and limit their outbound bandwidth. This resolved all of our academic issues, and everyone was happy. Except the resident students. I have been asked to change/remove the policing policy at the end of the day, to allow the residents access to the unused bandwidth at night. There's no reason to let bandwidth sit unused at night just because it would be abused during the day. Is there a way to setup Time of Day based Policies on the ASA? Ideally I'd like to be able to open up the network at night and all day during weekends. If I can't set Time based policies, is is possible to schedule the ASA to load a set of commands at a specific time? I suppose I could just setup a scheduled task on one of our servers to log in and make the changes with a simple script, but this seems like a hack, and I'm hoping there is a better or more standard way to accomplish this. Thanks. Edit: If there is a totally different solution that would accomplish a similar goal, I'd be interested in that as well. Free/Cheap would be ideal, but if a separate internet connection is my only other option, it might be worth fighting for money for hardware or software to do this better or more efficiently.

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• PHP sessions currupt

  - by Baversjo

  Using symfony framework 1.4 I have created a website. I'm using sfguard for authentication. Now, this is working great on WAMP (windows). I can login to several accounts on different browsers and use the website. I have ubuntu server 9.10 running apache (everything up to date and default configuration). On my server, when I login to the website in one browser it works great. When I on my other computer login with another user account on the public website, the login is successful. But when I refresh/go to another page the first user is shown as logged in instead! Also, when I press logout, It's not showing that I'm logged out after page load. When I press f5 again I'm logged out. As mentioned, all this works as expected on my local installation. I'm thinking there something wrong with my PHP session configuration on my ubuntu server, but I've never touched it.. Please help me. This is a school project and I'm presenting it today :(

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• Overriding vhost.conf to always allow PHP include access to directory

  - by Jeremy Dentel

  My predecessor in my job developed a simplistic newsletter system for our school's newspaper utilizing PEAR's Mail package. As I grow this system (and our site) we are constantly stuck with Plesk rewriting the vhost.conf file in which the PEAR include path has been manually entered. This has become an unwieldy task to actually manage and keep running. There's been a "note" from both the previous developer and I to attempt to solve this problem, but we can't entirely figure it out. I'm attempting a move to cPanel through another host, so hopefully it'll go away there, but until then, it can be tedious extremely difficult to get a solid uptake of the system without constant "web-presence." I've searched around and haven't found a solution. I'm rather new to the server management scene (command line was non-existant till around a year ago. =/), so I haven't found anything. Any help would be useful. "Similar Questions" popped this up, but it still seems to rely on vhost.conf, and will still allow changes within Plesk to overwrite the changes.

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• Hardware chose: ASUS Eee Pad Slider or ASUS Eee Pad Transformer for web development?

  - by JamesM

  I was just wondering out of the following Tablets which one seams better to get? I am a web-developer, Always using Unix/Linux/BSD, I want a tablet that has a keyboard. http://gdgt.com/asus/eee/pad/slider/ http://gdgt.com/asus/eee/pad/transformer/ http://www.tweaktown.com/news/18311/asus_eee_pad_slider_transformer_tablets_with_physical_keyboard/index.html I know both are similar, but not sure what one I should get. The Slider seems very nice but again the keyboard is fixed to the tablet unlike the Transformer. P.S: I'm going to use one of the above to showcase my programming work at school, as well as just being used as a cheaper notebook than the $300 Windows.7 locked down notebooks. By Locked down, I mean we pay $300 for them and after 3 years we can do what ever to them, they are Lenovo thinkpad mini-10 and What they have installed is all you get, they don't let us install what ever OS on them. And with the question on both of those links, I think that the transformer would be better but that is only taking in the fact of it being both a tablet and a notebook. What I really care about is power; which one is more powerful? It will be running kFreeBSD-Debian-Squeeze with Linux-Mint theme with several other packages. Though I'm not going to run Windows (which I feel is bloated), I still want power. To help keep my computer from slowing down with cache, I will have a cron.d/hourly script cleaning out the cache memory.

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• Installing Windows 7 over PXE, preferably with domain autojoin

  - by Ivan Vucica

  At an educational non-profit, I've inherited a previously set-up Windows domain that, after the first reinstall of the machines, we ended up not using by simply not joining machines back into the domain. Over last summer, before the annual reinstall for shipping machines to the summer school, I toyed with the idea of installing Windows 7 over network, instead of just imaging the machines. It took a bit longer than I expected to figure out the basics; honestly, I expected that Windows would be more friendly for PXE installation out of the box. What I'm interested in is best practices for installing Windows 7 over PXE with domain autojoin. I'd love it if the whole setup could optionally be hosted on a UNIX based system as well. I've had some success by preparing an ISO using Windows Deployment Kit, and loading the ISO into memory. This was needed since I wanted a menu, and I think I couldn't get PXELINUX to chainload into Windows' bootloader. Unfortunately, I couldn't figure out much about customization of the Windows setup in that timeframe nor could I get Samba to work properly; studying the stuff ended up being too lengthy, especially the portion where I edited a disk image on Windows and copied it outside. WDK didn't make things easier by mounting the disk image into RAM, and writing it in its entirety when done with it, making me a very sad boy. I've recently found a different approach, too, that appears to be closer to Microsoft's original idea for netboot deployment and does not involve ISOs. So my question boils down to the following. What exact approach do you use for netbooting Windows 7 setup? How can Windows 7 setup be best customized to be completely unattended, including installation on specific system partition and not destroying the data partition, creation of passworded admin and default user, choice of MAC-address-based hostname, and joining a domain? As much details as possible for everyone's future reference would be appreciated. WDS isn't a bad choice, but if a Linux-based install can be used, that'd be better.

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• VLAN for WiFi traffic separation (new to VLANing)

  - by Philip

  I run a school network with switches in different departments. All is routed through to a central switch to access the servers. I would like to install WiFi access points in the different departments and have this routed through the firewall (an Untangle box that can captive-portal the traffic, to provide authentication) before it gets onto the LAN or to the Internet. I know that the ports that the APs connect to on the relevant switches need to be set to a different VLAN. My question is how do I configure these ports. Which are tagged? Which are untagged? I obviously don't want to interrupt normal network traffic. Am I correct in saying: The majority of the ports should be UNTAGGED VLAN 1? Those that have WiFi APs attached should be UNTAGGED VLAN 2 (only) The uplinks to the central switch should be TAGGED VLAN 1 and TAGGED VLAN 2 The central switch's incoming ports from the outlying switches should also be TAGGED VLAN 1 and TAGGED VLAN 2 There will be two links to the firewall (each on its own NIC), one UNTAGGED VLAN 1 (for normal internet access traffic) and one UNTAGGED VLAN 2 (for captive portal authentication). This does mean that all wireless traffic will be routed over a single NIC which will also up the workload for the firewall. At this stage, I'm not concerned about that load.

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• ActiveDirectory user files aren't being shared? [on hold]

  - by Ryan

  I'm taking a class in college and my current project is to setup Active Directory. So I have two VMs, one is Windows Server 2008 R2 and the other is Windows 7. I setup the domain team15.net (this is the FQDN for the forest) on the W2008 server machine. And then I connected the Windows 7 machine to the team15.net domain, and now I can login to the administrator account on the W2008 machine by using TEAM15\Administrator for the username. However, any files that I add in Windows 7 while logged into TEAM15\Administrator are NOT shown in the Windows 2008 machine. Is this normal? It seems like any files I add to this user in the domain only exists for the machine that I'm currently using. Is it possible to change this so all files for all users are synced to all computers in the domain? If not then what are alternatives? I noticed that back in high school we also used domains but there was a shared drive E:\ that you had to store your files because if you put them on in the desktop instead then they would suddenly disappear once you logged out and back in. How can I setup a shared drive? and which computer would provide the storage for this drive?

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• Connecting to unsecured wireless network

  - by Sanchez

  I would like to know what information is public and can be intercepted in a non-open, but unsecured wireless network. Moreover, is there anything I can do to make it more "secure", other than using https connection whenever possible. In more details, I recently discovered (with surprise) that the wireless network in my school is actually unsecured. Although not everyone can connect to it (you need a student ID), I am told that certain softwares like Wireshark would be able to intercept the data. Since I have been using the network for all private purposes (email, facebook etc), I do feel quite insecure now and would like to understand the situation a bit better. I installed Wireshark and tried to play with it but all I can see are something alien to me. In any case, all I see seems to come directly/indirectly from my IP address, and I have long thought that usually different computers in the same wireless network would be assigned different addresses. Am I wrong? If not, then I feel very confused about what information is actually being captured (potentially by other users in the network, since I don't think I could capture activities of others in the same network anyway), and whether it's safe to use the network at all. (Gambling on others in the same network showing good behaviour is apparently not an option.) Thank you.

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• Change default profile directory per group

  - by Joel Coel

  Is it possible to force windows to create profiles for members of one active directory group in a different folder from members in another active directory group? The school here uses DeepFreeze to protect public computers. In a nutshell, DeepFreeze prevents all changes to a hard drive such that every time you restart the machine the disk is identical to it was at the time you froze it. This is a bit different than restoring to an image, in that it never really wrote changes to disk in a permanent way in the first place. This has a few advantages over images: faster recover times, and it's easy to thaw the machine for a few minutes to perform maintenance such as windows updates (which can even be automated). DeepFreeze also allows you to configure a "thawspace" partition, where changes are persistent across reboots. One of the weaknesses of DeepFreeze is that you end up needing to create a new profile every time you log in, unless your profile existed at the time the machine was frozen. And even then, any changes you make to your profile while working on a frozen machine are lost. As students have frequent legitimate needs to log in to our classroom machines, there is currently a lot of cleanup involved from time to time in removing their old profiles and changes, so I want to extend DeepFreeze to protect our classroom computers as well as public computers. The problem is that faculty have a real need to keep a stateful profile locally on these classroom computers. The solution I would like to use is to configure Windows via group policy (or even manually, if that's the way I'll have to do it) to place profile folders on the thawspace partition, but only for members of the faculty security group. Is this possible?

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• Syntax error on line 494 of httpd.conf: Cannot load .../php5apache2_2.dll into server

  - by pikachu

  I have been learning PHP. I had installed Apache-server (not in a combination-suite like USBWebserver). Now I'm trying to put my sites on a portable stick, using USBWebserver. I already used that program before to carry MySQL databases with me (and Apache worked as well, cause I used the included PHPMyAdmin for managing the databases.), but now it doesn't work anymore. When I start the program, I keep having the text saying Apache is offline. I've tried to open Apache using the command line (don't know what that would do, but, it's just a try). I got an error message saying Syntax error on line 494 of C:/.../httpd.conf: Cannot load C:/.../php5apache2_2.dll into server: (The following is translated from Dutch) An initialization routine of the dynamic link library (dll-file) has failed. Line 494 says this: LoadModule php5_module "C:/Users/School/Downloads/USBWebserver v8_en/php/php5apache2_2.dll" My first Apache installation (its service) is not running. The ports are different. And I also uninstalled the service (using the httpd.exe -k uninstall command); What can be the problem? Thanks for help.

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• my cpu won't start. all fan were spinning for a second then nothing happen

  - by Tommy

  I need help about this.. I'm from Malaysia.. Back then my cpu is all okay..and it's 4 year old.. I think this question is answered before but i'm still don't understand.. when i plugged my cpu..turn it on and all of the fan (graphic card, mobo fan and PSU fan) were spinning just for a second than nothing happen.. I don't know if it is because of the PSU or my mobo.. I sent my cpu to the shop and they said it must be the mobo.. They tell me to change my mobo and PSU also..and it cost over 100 buck (rm300 in Malaysia). and i'm real 'dry' right now. My whole data is inside the HDD. School projects, photos, games, and many..I really-really need my cpu back alive.. My mobo is MSI MS-7529 with dual core chips. My PSU is ATX-480W. the PC store guy said i need to change to new ASUS mobo if I want. I dont know what type it is but Then he tell me to change my PSU also because he don't think my old PSU (ATX-480W) ain't compatible to the new mobo.. I was very need a help from you techie guys.. sorry for my terrible English..

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• Windows Small Business System 2003. SQL timeout in Server Performance Report

  - by tetranz

  I'm the volunteer IT admin at a small school. We have SBS 2003 with about ten desktops. The server performance report is emailed to me daily. It is setup with a wizard in the Monitoring and Performance part of the "Server Management" console. It often fails with a "The page cannot be displayed" error. The event log shows Event Type: Error Event Source: ServerStatusReports Event Category: None Event ID: 1 Date: 1/16/2011 Time: 6:03:14 AM User: N/A Computer: ALPHA Description: Server Status Report: URL: http://localhost/monitoring/perf.aspx?reportMode=1&allHours=1 Error Message: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. Stack Trace: at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, TdsParserState state) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, TdsParserState state) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.ReadNetlib(Int32 bytesExpected) [plus lots more stack trace] This has been happening for years :) I've never really solved it. It seems to be related to WSUS. When it happens, I run the Update Services "Server Cleanup Wizard". That takes a long time to run. If I haven't run it for a while it can take 10 hours. I also run the WsusDBMaintenance.sql script (from TechNet I think) which reindexes the database etc. Those two things seem to get it working again for a while. Recently the "while" has become a couple of weeks. My searching online has revealed lots of people having this problem but no real solution. Does anyone have any good ideas about this? I have to wonder if something in the WSUS SQL schema is not indexed properly. The time that the server cleanup wizard takes seems ridiculous. Thanks

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• TCP/UDP hole punching from and to the same NAT network

  - by Luc

  I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be. What happens when using hole punching on the same network, is that it will send a packet out with the same destination and source address. Only the source and destination port would differ. I imagine a router with NAT loopback enabled will handle this as it should, but how about other routers? Would they drop the packet, or would a router (the first?) from the ISP bounce the packet back after which it gets handled okay? I'm wondering because I was thinking about using this technique to circumvent a block between peers in a network (like a school network where clients can only access the internet, but any contact with each other is blocked). The only other option is to use a man in the middle as proxy (tunnel?). The disadvantage of this is that you have to have a server with significantly more bandwidth than one that would only do hole punching. Also the latency would increase significantly.

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• Linux Distro - GUI similar to Windows

  - by DeaconDesperado

  I am in the process of refurbing several older laptop machines for use by a couple college guys we have in training to learn basic web development in python. These are students who intern at my company and are hoping to do some work when the summer comes building simple client-oriented webapps (learning the basics of OOP, MVC webapp design in flask, etc.). We're trying to function as the "practical" side of their education. I would like to get them set up on these machines we have sitting about, but I'd like to use a linux distro that would have a gui that closely approximates what they are being compelled to use at school (windows.) I don't really have much of a preference as far as GUI goes since much of what we'll be learning together is accomplished on the command line. I just see this as an easier adjustment for them while they are still reliant on a graphical environment. In the past I'd go straight for Ubuntu, but since they started using the Unity GUI the responsiveness overall can be pretty clunky on older machines, especially since these machines (there are four of them) run the gambit on specs (though all are at least 1.0Ghz and none have anything better than basic integrated video.) Has anyone had to setup a similar working environment in Mint, bare Debian or Zorin? Thanks.

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• How to set an executable white list?

  - by izabera

  Under Linux, is it possible to set a white-list of executables for a certain group of users? I need them to be unable to use, for example, make, gcc and executables on removable disks. How can this be done? Edit, let me explain better. I'm dealing with a high school IT system, young geeks that (during the lessons) want to play, surf the net, damage those computer however they can. The major step to achieve this goal was to remove the system they're familiar with and install Ubuntu in all the computers. This actually works quite well, but recent events proved that this is not enough. I want to allow them to execute certain safe programs, like Open Office, and to deny any other program, whether it is preinstalled software, something they carry in usb drives, a downloaded program or a script they program on site. It's possible to remove the 'x' permission on any file on the pc, but of course it would be impractical. Furthermore, they would be able to run anything they download. I thought the best solution would be to make a white-list of safe programs and to deny anything else, but I don't really know how to do it. Any idea is helpful.

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• vSphere education - What are the downsides of configuring virtual machines with *too* much RAM?

  - by ewwhite

  VMware memory management seems to be a tricky balancing act. With cluster RAM, Resource Pools, VMware's management techniques (TPS, ballooning, host swapping), in-guest RAM utilization, swapping, reservations, shares and limits, there are a lot of variables. I'm in a situation where clients are using dedicated vSphere cluster resources. However, they are configuring the virtual machines as though they were on physical hardware. In turn, this means a standard VM build may have 4 vCPUs and 16GB or more of RAM. I come from the school of starting small (1 vCPU, minimal RAM), checking real-world use and adjusting up as necessary. Some examples from a "problem" cluster. Resource pool summary - Looks almost 4:1 overcommitted. Note the high amount of ballooned RAM. Resource allocation - The Worst Case Allocation column shows that these VMs would have access to less than 50% of their configured RAM under constrained conditions. The real-time memory utilization graph of the top VM in the listing above. 4 vCPU and 64GB RAM allocated. It averages under 9GB use. Summary of the same VM What are the downsides of overcommitting and overconfiguring resources (specifically RAM) in vSphere environments? Assuming that the VMs can run in less RAM, is it fair to say that there's overhead to configuring virtual machines with more RAM than they need? What is the counter-argument to: "if a VM has 16GB of RAM allocated, but only uses 4GB, what's the problem??"? E.g. do customers need to be educated? What specific metric should be used to meter RAM usage. Tracking the peaks of "Active" versus time?

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