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• Should I limit end-user gigabit ports to avoid saturating uplink/trunk connections?

  - by Joel Coel

  We have a campus with 16 buildings and older 850nm 1Gbps fiber links between the buildings, that all come to a core switch for our servers that also uses 1Gbps ports. We're finally starting to replace our aging 10/100 end-user switches, and much of what we're looking at are 1 Gbps units. My question is, since the trunk/uplink lines are still 1Gbps, if I were to install 1 Gbps switches for end users, should I limit the ports to 100Mbps until I can also upgrade the trunks to avoid allowing a bad-behaving host to saturate a trunk line (since we're a college, we have plenty of mis-behaving hosts) and thereby create a DoS situation for a building, or will TCP congestion control typically take care of that for me? What if we have a lot of UDP traffic (games, video chats, even a small amount of bittorrent)?

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• Add directory to $PATH if it's not already there

  - by Doug Harris

  Has anybody written a bash function to add a directory to $PATH only if it's not already there? I typically add to PATH using something like: export PATH=/usr/local/mysql/bin:$PATH If I construct my PATH in .bash_profile, then it's not read unless the session I'm in is a login session -- which isn't always true. If I construct my PATH in .bashrc, then it runs with each subshell. So if I launch a Terminal window and then run screen and then run a shell script, I get: $ echo $PATH /usr/local/mysql/bin:/usr/local/mysql/bin:/usr/local/mysql/bin:.... I'm going to try building a bash function called add_to_path() which only adds the directory if it's not there. But, if anybody has already written (or found) such a thing, I won't spend the time on it.

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• LAMP: How do I set up http://myservername.com/~user access?

  - by Travesty3

  Been trying to Google this, but I can't figure out good search terms to find any info about what I need, since I don't really know what it's called. I'm pretty much being thrown to the wolves to figure out how to set up a LAMP server. We had someone who knew how to do it, he set one up and then quit. It was set up so that when I went to "http://{myservername}.com/~travis" it showed the contents of my /home/travis/public_html folder. This worked fine, then we lost power and the server restarted (I know, battery backup, but this is a dev server in a dev building so it's OK). Now, the browser can't find that URL. I also need to know how to set this up on a new server, so instead of wasting time diagnosing this problem (probably just something dumb I did messing with settings or something), I really need to know how to set this up from scratch. Thanks for taking the time to read this and (hopefully) answer!

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• How can I rewrite a URL and pass on the original URL as a parameter?

  - by Bobby Jack

  I'm building a site that needs to include a 'check' procedure, to do several initiation tasks for a user's session. Examples include checking whether they're accepting cookies, determining if their IP address grants them specific privileges, etc. Once the check is complete, I need to redirect the user back to the page they originally requested. The plan is to use RewriteCond and map all URLs to an 'initiator' if the user doesn't have a specific cookie set. Let's say I want to rewrite all URLs (ultimately, with some conditions, of course) to: /foo?original_url=... Where the ... is the original URL requested, URL-encoded. The closest I've got is this: RewriteRule ^(.*)$ http://localhost/php/cookie.php$1 [R=301] I can then inspect the original URL, captured in the backreference, via PATH_INFO. However, this is pretty messy - I would much prefer to pass that value as a URL parameter

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• SAS instead of SATA 2 for my hard drives?

  - by jasondavis

  I am building a new system soon, I will have multiple 1-2tb hard drives for storage in it. I only have experience uasing the sataII drives but I saw somewhere that I should be using something like SAS? I read that if I were going to have 20 drives that I could use 4 SAS cables vs 20 SATA cables. Can someone help me understand this better? If it were only 4 cables then how would 20 drives hook up? Also can a regualr sata2 drive hook up to that?

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• How to install PyQt on Mac OS X 10.6

  - by Albert

  I want to install PyQt. This seems kind of complicated to install on OS X. I haven't found any precompiled packages of it (are there any? I would really prefer those). So I downloaded PyQt. And SIP, because it depends on that. These files: http://www.riverbankcomputing.co.uk/static/Downloads/PyQt4/PyQt-mac-gpl-4.7.3.tar.gz http://www.riverbankcomputing.co.uk/static/Downloads/sip4/sip-4.10.2.tar.gz Did a python configure.py && make && sudo make install on SIP -- installed without any problems. Tried the same on PyQt -- and failed of course: /Library/Frameworks/QtCore.framework/Headers/qglobal.h:288:2: error: #error "You are building a 64-bit application, but using a 32-bit version of Qt. Check your build configuration." Ok, so I tried with python configure.py --use-arch=i386. Same error. Any idea?

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• How do I remote desktop to my work's Windows box from my Mac at home through VPN?

  - by CT.

  I would like to remote desktop from my Macbook to my Work's laptop from home. I connect to the work's network via Cisco VPN. My Cisco VPN clients connects fine in Mac OS X but I am unable to remote desktop. I am also unable to ping my work laptop. The laptop is powered on and not sleeping. I can access it via LogMeIn. If I were to actually pug into our network at the building. I can remote desktop to my work laptop from my Macbook. If I use a Windows virtual machine and connect using the Windows Cisco VPN client, I am able to RDP and ping my work laptop. What is wrong with my OS X VPN connection?

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• Are VLANs necessary for my environment?

  - by kleefaj

  Greetings. I'm the new network manager for a school. I've inherited an environment made up of several Windows servers, about 100 Windows clients, ten printers, one Cisco router, six Cisco switches, and 1 HP switch. Also, we're using VoIP. There are four floors in our building. The hosts on each floor are assigned to a separate VLAN. An office on the first floor has its own VLAN. All the switches are on their own VLAN. The IP phones are on their own VLAN. And the servers are on their own VLAN. For the number of hosts on the network, are all these VLANs really buying me anything? I'm new to the VLAN concept but it seems overly complicated for this environment. Or it's genius and I just don't get it. Any thoughts? Thanks, Jeff

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• Windows 7 Locking Executable Files

  - by James Burgess

  Since I've been using Windows 7 RTM (as opposed to the Beta and RCs), I've been having a peculiar issue with executable files. I first noticed it whilst using Visual Studio, in that when building a project, it would often fail saying that the output file was locked - but the problem has stemmed further. When I've executed an application, closed it (cleanly), and attempted to delete/move/rename/overwrite said file, Windows 7 tells me that the file is locked/access is denied. I've made use of software like LockHunter/Unlocker but it is seemingly unable to remove these locks (most of the time, it shows no locks at all). After about 5-10 minutes, the respective files are unlocked again, but needless to say this is a bit of a workflow-breaker (as it's not simply constrained to VS). I've done the usual tasks of virus/malware scanning, and turned up with absolutely nothing. I've got no peculiar services running, and the problem was not present before I installed a Windows 7 RTM version. Any help is greatly appreciated.

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• ESXi - Should failover node be in the same geographic location?

  - by Ryan

  For some reason it seems to me that at least one failover should be in the same building. But really I have no idea. Could there be an issue with routing delays for users during a failure? I'm just imagining reasons at this point. Let me know, should at least one failover node be at the same geographic location as the other? I am trying to prevent what appears to be a poor decision so any feedback or life experience you can share would be grand. Will mostly be running Windows Server 2008 with SQL Server 2008 as our guest OS.

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• How can I join two simple home networks together using an ethernet cable?

  - by Ilia Jerebtsov

  I want to join two different home networks together like so: PC A1 PC A2 PC B1 PC B2 \ / \ / Gateway A <----- ethr. cable -----> Gateway B | | ADSL modem A ADSL modem B Both networks are of the basic residential type with identical configuration, with all PCs running Vista/7. The point is to temporarily join two apartments in a building for gaming and file sharing, and the holy grail would be: PCs on network A can access PCs on network B and vice-versa (file shares and gaming). Each network uses its own internet connection. Data between networks shouldn't take a trip through the internet (broadband upload speeds are severely capped) A network's internet access should continue working if the joining cable is disconnected with minimal configuration changes. How closely can this be achieved?

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• How to reliably run a batch job every 5 seconds?

  - by Benjamin

  I'm building an application where the sending of all notifications (email, SMS, fax) will be asynchronous. The application will write the notifications to the database, and a batch job will read these notifications and send them with the appropriate transport. I was first reading at ways to run cron faster than the minute, and realized this was a bad idea. The batch scripts are written in PHP, and I guess that writing a proper daemon would be quite an overhead (though I'm open to any suggestion, as PHP car run indefinitely as well). What I have in mind is a solution that would: Run the PHP script every 5 seconds Check that the previous run has finished, or abort (never 2 concurrent batches running) Kill the script if live for more than x minutes (a security in case it hangs) Start with the system (if a reboot occurs) Any idea how to do this?

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• How can I VPN into a domain and act as if it is local?

  - by Duall

  I've looked and looked and the internet seems to have finally failed me, there's no information on my specific issue. I have two locations, and one server (sbs 2008); I need them to act like one physical LAN. I know it's possible, I just know how to set it up, or anything about VPNs, etc. So, just to clarify a bit more: 1 Small Business Server 2008 ~30 Computers with varying systems from Windows XP to 7 2 Physical Locations I use redirected folders, but since that would consume a lot of bandwith over VPN, I have a machine over there that can be the workhorse for storage. Users need to access e-mail and shared databases from this server (or possibly some form of DFS with aforementioned workhorse) from the other building. Is there a nice tutorial (or I nice person that wants to write it) online that can explain how to set up computers from an external network to act like they were in the LAN?

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• Testing performance from around the world - how do I get a linux shell easily in multiple countries?

  - by Matthew O'Riordan

  We are building a socket based service where latency is paramount, and as such we have servers distributed into 7 data centres around the world. However, whilst we know we're bringing the servers closer to the clients, it's very difficult to know how effective this is, and importantly, what difference this makes compared to our competitors. As such, we want to run simple scripts that test latency and throughput for both our service and our competitors, which is easy enough using Amazon, however Amazon only have 7 data centres. We would like to know for example how we perform in locations all over the world such as South Africa, Australia, China, Peru etc. Does anyone know of any service where we could piggy back off their global infrastructure and run some scripts to test this performance? The obvious contenders are people like Monitis, but I don't think they would allow us to run custom scripts, only standard protocol monitors. Thanks for your help. Matt

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• Using wifi router as bridge to increase signal?

  - by overtherainbow

  A friend of mine lives in an appartment building whose structure is such that wifi signal is very weak. Even a USB key won't work. I was thinking of buying an entry-level wifi router and reconfigure it as a bridge to act as repeater. Would that increase the chance of getting a good signal, or I shouldn't bother? If experience shows that it does improve things significantly, is their another router I should look at besides the Linux-based Linksys models? Thank you.

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• W3c Markup Validator on Windows 2003 with Apache

  - by rihatum

  Hi All, OS = Windows 2003 (latest sp / hotfixes etc) Perl = Active Perl 5.8.9 Build 825 Apache 2.2.11 Followed the following How-To: http://validator.w3.org/docs/install_win.html Facing the following errors : (had an html error too, but I used Perl Package manager to upgrade the required package. Now, the Package manager isn't showing any update of the following package and some others too : SGML::Parser::OpenSP version 0.991 required--this is only version 0.99 at C:/www/validator/httpd/cgi-bin/check line 61. Q : How can I download the latest package for OpenSP ? Q : Would It be just a matter of click and install the package? If someone can provide a step by step that would be very helpful, I am not fluent with building perl packages. Thanks and Regards

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• unable to properly execute binaries from PHP

  - by Lowgain

  I was building an app on a SUSE box, and had a binary called create_group for instance, which had a suid bit and allowed my PHP app to call exec('create group grpname'); and create a new group (there are others for users, etc). The binary was a small c script that calls setuid(0) and then runs the user creation stuff. This worked perfectly on the SUSE box I recently moved my project to Ubuntu and everything works fine except these binaries. I can run them from the shell and they work okay, but when I get the PHP app to run them it just does nothing. Is there anything Ubuntu would be doing differently that I'm missing?

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• Which software to use for RAMDISK on Windows 2008?

  - by Tony_Henrich

  I am building a server machine with lots of RAM. At least 16G. I am planning to put my frequently read and written data in RAM so I am looking for software for creating RAM disks. This is for Windows Server 2008 R2 Standard 64bit. Any recommendations? I would like one where I can flush the disk image into persistent storage upon demand. For example when Windows shuts down. (I am aware of all the consequences of data loss when power is lost)

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• Connect to MySQL trough command line without need root password

  - by ReynierPM

  I'm building a Bash script for some tasks. One of those tasks is create a MySQL DB from within the same bash script. What I'm doing right now is creating two vars: one for store user name and the other for store password. This is the relevant part of my script: MYSQL_USER=root MYSQL_PASS=mypass_goes_here touch /tmp/$PROY.sql && echo "CREATE DATABASE $DB_NAME;" > /tmp/script.sql mysql --user=$MYSQL_USER --password="$MYSQL_PASS" < /tmp/script.sql rm -rf /tmp/script.sql But always get a error saying access denied for user root with NO PASSWORD, what I'm doing wrong? I need to do the same for PostgreSQL, any help? Regards and thanks in advance

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• Render a 3D image as a 2D vector image

  - by Clinton Blackmore

  Is there any software that will take a 3d model (in any format) and allow you to render it as a 2D vector image (preferable as either an .SVG or .PDF)? My intention is to render LEGO building instructions this way. While there are many tools that let you view them or generate nice, rasterized output, I'd really like to be able to generate vectorized output. Textures are not needed, and hidden line removal may not be needed. I could use a tool that works on any platform (although my preference is OS X, Linux, then Windows). Open source is preferred. If no one knows of a tool that does this, does anyone have a good recommendation of something to hack on and add a feature to output via Cairo?

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• glassfish v3 and java EE in production mode: what are the options to update a live web app?

  - by shadesco

  I am building a web app using java EE and glassfish v3. I want to move it to production mode soon, however i have zero experience with using glassfish in production, i would appreciate if you give me some guidance about how to approach the following scenario: say i have deployed the web app using admin console pointing to the .war file. But what if i want to update this live application, do i need to : a) undeploy -- build new war file (with updates) -- paste the war file to the app folder --redeploy? b) move in only the changed files , ie : .class files , jsp, etc... without undeploying before?

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• Why are hard drives moving to 4096 byte sectors, vs. 512 byte sectors?

  - by Chris W. Rea

  I've noticed that some Western Digital hard drives are now sporting 4K sectors, that is, the sectors are larger: 4096 bytes vs. the long-standing standard of 512 bytes. So: What's the big deal with 4K sectors? Is it marketing hype, or a real advantage? Why should somebody building a new PC care, or not, about 4K sectors? Why is this transition taking place now? Why didn't it happen sooner? Are there things to look out for when buying a 4K sector hard drive? e.g. incompatibility? Anything else we should know about 4K sectors?

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• My BrowserHelperObject is detected by avg as a malware, what is going wrong.

  - by BHOdevelopper

  Hi i'm building a BrowserHelperObject in c++ for Internet Explorer 8. It is a friendly add-on that gives you fonctionalities in a sidebar. The thing is that when you download the add-on executable from the web, AVG (AntiVirusGuard) detects the executable file as a malware. I did a lot of research and i can't find a way to not being seen as a bad malware. I know that BrowserHelperObject are often seen as malware, but mine is just a good and friendly add-on. Does anyone as info on how antivirus detection works and what can i do to prevent being seen as a malware. What has to be done to the BHO to pass avg detection ? Thank you.

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• Share wired internet connection of windows 7 pc to iPad via bluetooth?

  - by Joshua Rountree

  At my work, we have wireless... but our desktops are wired. The wireless in the building is sparse and horrible and my iPad has an unstable wifi connection to it. However, I was wondering since my iPhone is capable of sharing internet to my iPad via bluetooth protocol, if my PC could somehow reproduce that same protocol and allow the iPad to do the same? I'd love it if my iPad had a stable connection via bluetooth when it's just sitting near my desktop. Please advise! Thanks!

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• Can only connect to IIS site through localhost

  - by Rembrandt Q. Einstein

  I'm building a web service for my company's iPhone application, and everything's been working smoothly by running tests through localhost on the development machine. I'm now in the phase where I need to test connections from other computers within the network, and any connection other than localhost gives me a 404. My internal IP, 127.0.0.1, and computername all get 404 when connecting from any computer, either the one the site's hosted on or any others on the network. Telnet can get through to port 80, and I've temporarily disabled all firewalls on this machine (I do not have control over the external firewall, but I'm only testing connections within the network) Does anyone have a clue why this is happening? I was able to connect to the web service from other computers when hosted on a Mac via Apache, but because I'm now using a SQL Server connection I'm restricted to using IIS for Windows Authentication. Googling only provided answers related to firewalls, and mine is disabled note: I cannot use Anonymous Authentication, but even in testing that it did not affect the issue.

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