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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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• Is this JS code a good way for defining class with private methods?

  - by tigrou

  I was recently browsing a open source JavaScript project. The project is a straight port from another project in C language. It mostly use static methods, packed together in classes. Most classes are implemented using this pattern : Foo = (function () { var privateField = "bar"; var publicField = "bar";     function publicMethod() { console.log('this is public');     } function privateMethod() { console.log('this is private'); } return {   publicMethod : publicMethod, publicField : publicField }; })(); This was the first time I saw private methods implemented that way. I perfectly understand how it works, using a anonymous method. Here is my question : is this pattern a good practice ? What are the actual limitations or caveats ? Usually i declare my JavaScript classes like that : Foo = new function () { var privateField = "test"; this.publicField = "test";     this.publicMethod = function()     { console.log('this method is public'); privateMethod();     } function privateMethod() { console.log('this method is private'); } }; Other than syntax, is there any difference with the pattern show above ?

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• Best server sync software/methods [closed]

  - by Meep3D

  I have a test server at home and a test server at the office. I'd like to somehow sync multiple folders in both directions automatically so I can work at home and to also provide an offsite backup. I've tried Live Sync (Microsofts own product) but it chokes on large amounts of files and seems a bit rudimentary. Dropbox is also a bit small and does not adapt to our filesystem setup. I have seen a few online backup services but none seemed geared to multiple computers using the same account. I don't mind paying a monthly fee provided the service is good. Suggestions would be greatfully appreciated!

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• What are the design principles that promote testable code? (designing testable code vs driving design through tests)

  - by bot

  Most of the projects that I work on consider development and unit testing in isolation which makes writing unit tests at a later instance a nightmare. My objective is to keep testing in mind during the high level and low level design phases itself. I want to know if there are any well defined design principles that promote testable code. One such principle that I have come to understand recently is Dependency Inversion through Dependency injection and Inversion of Control. I have read that there is something known as SOLID. I want to understand if following the SOLID principles indirectly results in code that is easily testable? If not, are there any well-defined design principles that promote testable code? I am aware that there is something known as Test Driven Development. Although, I am more interested in designing code with testing in mind during the design phase itself rather than driving design through tests. I hope this makes sense. One more question related to this topic is whether it's alright to re-factor an existing product/project and make changes to code and design for the purpose of being able to write a unit test case for each module?

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• Virtualise Excel in a browser

  - by Macros

  Is it possible to give users access to a virtualised instance of Excel - I don't want to give them access to a full OS (although this will clearly be running in the background, all they can access is Excel - they don't even see any other screens)? Secondly, if it is possible, is it possible to do within a browser? Edit I am building a system which is designed to test candidates skills in Excel and for this reason needs to use the full desktop version and not a web app. I don't want to have to ensure Excel is installed on the client machine as there will be issues around differing versions and security as the workbook(s) that are used in the test use VBA extensively to customise and mark the exercises. Ideally my web app would be able to open a session to the server which then just puts the user into an instance of Excel without ever seeing a desktop. I would also need to be able to pass in command line parameters in order to define which workbook to open and also pass in a unique token to identify the user

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• Fedora: "Login Incorrect"

  - by darkblackcorner

  I've just set up a minimal install on my netbook (the default was too resource hungry, so I figured I'd customize the install and learn something about linux at the same time!) No problems logging in as root, but when I create a new user and try to login as them I just get the "Login incorrect" error. I'm certain the password is correct, though the secure log displays an authentication error. Am I missing a permission somewhere? useradd test usermod -p [pwd] test Shell is added automatically I think (checking password file says shell is /bin/bash) I've tried adding the user to the sudo-ers group usermod -a -G wheel which doesn't help. I've kept the password simple in order to rule out human error.

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• Reliance on the compiler

  - by koan

  I've been programming in C and C++ for some time, although I would say I'm far from being expert. For some time I've been using various strategies to develop my code such as unit tests, test driven design, code reviews and so on. When I wrote my first programs in BASIC I typed in long listings before finding they would not run and they were a nightmare to debug. So I learnt to write a small bit and then test it. These days I often find myself repeatedly writing a small bit of code then using the compiler to find all the mistakes. That's OK if it picks up a typo but when you start adjusting the parameters types etc just to make it compile you can screw up the design. It also seems that the compiler is creeping into the design process when it should only be used for checking syntax. There's a danger here of over reliance on the compiler to make my programs better. Are there better strategies than this ? I vaguely remember some time ago an article on a company developing a type of C compiler where an extra header file also specified the prototypes. The idea was that inconsistencies in the API definition would be easier to catch if you had to define it twice in different ways.

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• nginx: location, try_files, rewrite: Find pattern match in subfolder, else move on?

  - by Nick

  I'd like for Nginx to do the following: If the uri matches the pattern: http://mysite.com/$string/ and $string is not 'KB', and not 'images', look for $string.html in a specific subfolder. If $string.html exists in the subfolder, return it. If it does not exist, move on to the next matching location. $string = {any letters, numbers, or dash} For example, if the user requests: http://mysite.com/test/ It should look for a file called: /webroot/www/myfolder/test.html I've tried variations of: location ~ /[a-zA-Z0-9\-]+/ { try_files /myfolder/$uri.html @Nowhere; } But: It doesn't seem to find the file even when it does exist, and If it fails (which is always right now), it wants to jump to the @nowhere location, rather than moving on and trying to find another location that matches. I'd like for it to consider the current location "not a match" if the file doesn't exist.

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• Can I install linux has the host in a dell poweredge server (r710)?

  - by bksunday

  I might have a deal on dual six core poweredge server and I'm about to go test its performance but I'm wondering few things which I can't find answers for, and I can't test them before buying the machine. I don't want vmware at all so can I just wipe it and install linux instead, or is it embedded in some parts I have no access to. Will I still be able to update different firmwares (perc controllers, motherboard, etc) on this dell poweredge or does it require to have the vmware esxi installed as the host os. And optionally.. is there any foreseeable problems in doing so?

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• postfix + mysql, user unknown

  - by stoned

  I have installed postfix with dovecot and postfix admin and all seemed well at the beginning. I can log in with thunderbird and check the mailboxes (all empty now) and TRY to send mail, even TLS works. The problem comes when I try to send mail. This is the output of mail.log when I try to send mail from an address to the same address: Nov 23 16:41:55 mailforge postfix/local[6322]: 297792467C: to=, relay=local, delay=0.01, delays=0/0/0/0.01, dsn=5.1.1, status=bounced (unknown user: "test") Nov 23 16:41:55 mailforge postfix/qmgr[6293]: 297792467C: removed To me it looks like as if postfix tries to look for the user "test" while in the mysql database users are named as [email protected] . Where should I change this behaviour?

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• How to change memory for DomU runtime

  - by saffron

  I have a xen server with xen-4.1.3, linux-image-3.2.0-3-amd64, debian squeeze and 16Gb of RAM. The domain-0 has 1Gb of ram, the rest of memory belongs to the hypervisor. I want to start a guest domain with a minimal amount of memory and increase it runtime later. When I start a guest domain with 256Mb of ram and run xm mem-set domu 4Gb, I get ~3Gb only in domu and a guest domain free says: root@test:~# free total used free shared buffers cached Mem: 2830620 72868 2757752 0 2432 43504 -/+ buffers/cache: 26932 2803688 Swap: 1048572 0 1048572 And a guest domain dmesg says: [ 0.000000] Memory: 175912k/2883584k available (3527k kernel code, 448k absent, 2707224k reserved, 3210k data, 612k init) When I start a guest domain with 2Gb of ram I can run xm mem-set domu 7Gb and get ~7Gb of ram in a guest domain: root@test:~# free total used free shared buffers cached Mem: 6828228 74944 6753284 0 1328 12568 -/+ buffers/cache: 61048 6767180 Swap: 1048572 0 1048572 And a guest domain dmesg: [ 0.000000] Memory: 1674960k/16651264k available (3527k kernel code, 448k absent, 14975856k reserved, 3210k data, 612k init) How can I start a guest domain with a minimal amount of ram (256Mb) and increase it under 15Gb?

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• Windows 7 booting and startup repair issues

  - by aardvark

  I have a MSI FR720 laptop with Windows 7 and Lubuntu partions. For quite a while (6 months or so) I've been having issues booting from my hard drive, it'd take me between 5 minutes and several hours for me to be able to have it recognize the hard drive as a bootable device. I did several disk checks on it, and my hard drive seems in perfect condition, and the fact that booting would usually only work after removing the hard drive and trying to reset it in its slot or lightly shaking it makes me think it had something to do with the connection in the hard drive slot as opposed to the hard drive itself. I was having particular issues with it detecting the hard drive today so I decided to try booting it from an external hard drive dock. It detected it first try and so far has had no problems finding the bootable partitions on my hard drive. When I selected my Windows 7 partition from the boot menu it said that it hadn't been shut down properly last time and needed startup repair. I've done this several times over the last 6 months, so this is hardly unusual. I do startup repair, it fails, and then I try to do a system restore. The system restore also failed, and it says that no files were changed. I restart and try it again. However, this time when I get to the startup repair it's not detecting a Windows OS. I tried clicking next and doing a startup repair but the repair is always failing. If I ignore the startup repair option and instead select "Launch windows normally" it will get to the windows animation, stop halfway through and then crash into a BSoD. I can't read the error on the screen because it immediately switches to back and tries to restart. This is my first time asking a question like this online, so let me know if I need to provide any extra information and I'll do my best to give it I tried using diskpart to find the list of partitions and see if one's labelled as an active partition, but it says that no disk were detected. I can run Lubuntu just fine. I can also see all of my Windows 7 files from it EDIT: The startup repair diagnosis and repair log is this: -- Number of repair attempts: 1 Session details System Disk = Windows directory = AutoChk Run = 0 Number of root causes = 1 Test Performed: Name: Check for updates Result: Completed successfully. Error code = 0x0 Time taken = 15ms Test Performed: Name: System disk test Result: Completed successfully. Error code = 0x0 Time taken = 31ms Root cause found. If a hard disk is installed, it is not responding. -- Any chance that this is a result of me doing this through an external dock through a USB drive?

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• find files NOT belonging to group

  - by Michael

  How do I find files not belonging to particular group? find /home -group NOT test

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• How do I configure upstart to run a script on shutdown when the process takes longer than 10secs?

  - by Tiris

  I am running ubuntu 11.10 in a virtual machine (VirtualBox) to learn more about development in linux. I am using a git repository to save my work and have written a script to bundle my work up and save it to the shared folder for use while the virtual machine is not running. I would like to automatically run this script before shutdown so that my work is always available if the vm is off (currently I have to manually run the script). I don't know if upstart is the best way to accomplish this, but this is the config that I wrote as a test: description "test script to run at shutdown" start on runlevel [056] task script touch /media/sf_LinuxEducation/start sleep 15 touch /media/sf_LinuxEducation/start-long end script pre-start script touch /media/sf_LinuxEducation/pre-start sleep 15 touch /media/sf_LinuxEducation/pre-start-long end script post-start script touch /media/sf_LinuxEducation/post-start sleep 15 touch /media/sf_LinuxEducation/post-start-long end script pre-stop script touch /media/sf_LinuxEducation/pre-stop sleep 15 touch /media/sf_LinuxEducation/pre-stop-long end script post-stop script touch /media/sf_LinuxEducation/post-stop sleep 15 touch /media/sf_LinuxEducation/post-stop-long end script The result is that only one touch is accomplished (the first touch in pre-start). What do I need to change to see one of the touches after the sleep to work? Or Is there an easier way to get this accomplished? Thanks in advance.

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• Horrible time with WAMP, Joomla and Windows 7 (Permissions)

  - by jax

  I have WAMP and Joomla installed on Windows 7. I have made a virtual host outside of the www directory that houses a test joomla site. I have also made a joomla component that I want to install and test on this virtual host. I am having constant problems with permissions. I have given all users full access to the folder containing the files under the security Tab in Win7. It seems to me that when (Apache/PHP) creates a file it put restrictions on the permissions which does not allow it to delete or edit the file anymore so I have to manually go and delete the files when I want to uninstall my component. Also, I cannot install the .zip - instead I have to unzip manually to the tmp folder because when I upload the zip in the Joomla Installer I get the same permissions problems as above. How can I get rid of these issues once an for all?

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• Tool to automate basic connectivity testing

  - by feicipet

  After our vendors have setup a certain test environment, we need to go in to perform connectivity testing between PC to servers and also between servers. The problem is that we run a range of tests to telnet between 2 nodes on several ports and this is a manual and rather tedious process. Does anyone know of a small tool or script that I can take input on the range of ports to be test and will run an automated range of testing against those ports? All I need to do is to validate whether a TCP connection can be established from the source PC / server to the target server IP address / port. Thanks, Wong

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• Insanity Day 3

  - by D'Arcy Lussier

  So on Tuesday (Sept 25th) I did my 2nd Insanity workout (for those keeping track, I’m not counting the fit test as #1) and it was MURDER on my legs. I wasn’t able to get to it yesterday, and I’m noticing a trend in this first week – I can easily push to do it every 2nd day, but life is just too crazy busy right now (yeah yeah, excuses right? I look at it more like priorities – I have a tech conference I’m running next week, crazy days right now). Today I moved to the 3rd workout – but honestly I couldn’t get into it. It was the cardio recovery day, which is a lot of stretching and stuff. I think if I had been doing the first two sessions back to back I’d need it, but I didn’t want to cool down today – I wanted to push! So I moved to the next DVD in the series but for some reason couldn’t get it to run on my computer, even with SlyDVD. So – back to Disc 1 and the Plyometric Cardio Circuit! Fantastic workout again this morning. Don’t get me wrong, I’m not all of a sudden in amazing shape, but I am noticing already that I seem to be somewhat better – I’m really looking forward to my next fit test at the end of the month!

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• How to rsync just the current folder?

  - by Michael

  I want to sync some files from a remote server to my local computer. How can I make rsync to just copy the files with a certain file extension in the directory but no subdirectories? I assumed this to be an easy task, but embarassingly I'm not getting it for nearly 2 hours. So could someone give me an example? I did various experiments with something like the following command: rsync -a --include=what? --exclude=what? -e ssh [email protected]:/test /test

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• trying to copy security groups to a user using dsmod group utility in AD

  - by newbie

  i am trying to create a batch file that asks to enter source samid and destination samid. then using dsquery and dsget find out what security groups source samid is assigned to and assign destination samid to those security groups using dsmod. everything works except the dsmod group command. it doesnt do anything and batch file stops. if i literally put "CN=marketing,OU=test group,DC=abc,DC=com" instead of %%g and "CN=test1,OU=test group,DC=abc,DC=com" instead of %dusercn%, it works fine. can anyone help with this? i have pasted my scrip here. this last small thing is killing me. echo off echo %date% at %time% set /p susername=enter source user name: set /P dusername=enter destination user name: echo %susername% echo %dusername% set dusercn= %dusercn%=dsquery user -samid %dusername% echo %dusercn% for /f "tokens=*" %%g in ('dsquery user -samid %susername% ^|dsget user -memberof') do (dsmod group %%g -addmbr %dusercn%) echo completed pause

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• My Computer will not turn on?

  - by user269120

  I recently built a gaming pc. It was working fine before the following events: I installed a graphics card driver update then: in windows it said that the user experience index needed to be refreshed, so i started the test and somewhere in the middle of the test my pc just switched off. No shutting down just stopped. Now it won't turn back on. I have checked its plugged in and the switch on psu is down, i tried a different power cable and i checked all the connections. When i press the power button nothing happens, no fans no lights no post beep. Computer Parts: Motherboard: Gigabyte GA78LMT-USB3 CPU: AMD FX-6350 @ 3.9 Ghz RAM: 2x4gb Crucial Ballistix Sport Power Supply: Tesla 750w psu Graphics card: XFX Radeon 7870 DD Case: CiT Vantage R Gaming Case Hard Drive: 2TB Western Digital Caviar Green Please help me, this computer is only a week old since i built it. All anwsers are appreciated :)

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• Debian SMB share having permission issues in windows 7

  - by xxpor

  Hi Everyone, I setup a Debian squeeze server with samba. I then shared my /media directory with the following configuration: [media] comment=Hard Drives read only = no locking = no path = /media guest ok = yes browsable = yes directory mask = 0777 When the drives are mapped in Windows 7, the user can write to all of the subdirectories of media (sdb1, sdc1, etc), but cannot write to any folders that they create themselves in the subdirectories of media. For example, if the user mapped /media/sdb1 to Z:, and then creates a folder Z:\test, the folder is created successfully, but no files can be written to Z:\test. If the user ssh's into the server, they have no problems writing to these directories. I have included the screenshots, in order, of what happens on Windows. This samba share is mounted with ntfs-3g, if it makes a difference. Screenshots are here

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• Large OSX 10.6 to Windows 7 smb transfers fail?

  - by user41724

  I'm connecting to a windows 7 box from a OSX 10.6 box via smb: smb://ftp1 Connection works fine, I can transfer individual files one at a time, but as soon as I try and move an entier folder I get the following error: The Finder can’t complete the operation because some data in “test” can’t be read or written. (Error code -36) This error happens on all our OSX boxes when trying to push the entier folder to the Win7 box. The folder TEST in the above error message has -R 777 permissions. I can move every image file to the windows box one by one with no errors. But if I try an move the entier folder. bam error out. This error seems to kill the smb client on the Windows box as well. There's an FTP server on the windows box and I can FTP in from the OSX box and move everything just fine. Not sure what is going on here?

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• How can I access a shared Exchange mailbox with IMAP (over telnet)?

  - by gauteh

  I have an Mailbox which multiple users have access to, it works fine for me and I can add it in Outlook as an additional mailbox to my account and list all its content. I can access my personal mailbox using IMAP, I'm testing it by just telneting in and LIST'ing it. The problem is that another user trying to access it is having problems accessing it through IMAP; and I want to test if I can access the shared mailbox with my account - how can I do that in terms of IMAP commands? What I am doing now is: telnet mail.server 01 LOGIN user pass 02 LIST "" * 03 LOGOUT Edit: If there is another way to test this, that is an equally good answer.

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• Why might one hard disk perform slower than another?

  - by Styne666

  I have just bought two WD 3TB Reds (WD30EFRX) for a FreeNAS box and whilst doing burn-in testing it seems like one is consistently taking about 10% longer than the other. So far I've done: a dd read test of the whole device, a long SMART test and it's currently halfway through a badblocks -wvs. The second device is lagging behind the first on all of them. I'm running these commands on Debian stable in two Konsole tabs. Is there a reason this could be considered normal behaviour or is it worth running the tests independantly? They're both plugged in to the LSI 2308 (IT mode) on a Supermicro X10SL7-F.

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• What is a suitable way to correct this program? [closed]

  - by lamwaiman1988

  Possible Duplicate: How to deal with huge changes to a data specification? As described in this question, I need to modified a 4800 line c program to fulfill the new functional specification. However I have no idea of HOW to do it. Background: There is a updated version of a header file which the program depends on. I've speculated the changes and found that at least 30 critical changes are present. With the new header file, the c program cannot even compile. The error is too much that the compile said "too much error" and don't list every one. Unlike normal modification which can be easily test, this has no way to test without overcoming the 30 critical changes. For example, there would be no point to run the modified program with the old header file. On the other hand, with the new header file, the program can't run until I've covered every one of the 30 critical changes scattered in the new header file so that I can't even verify the correctness of each modification until there is no more compilation error. Do you have any idea to deal with this situation?

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