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• DNS A vs NS record

  - by Tiddo

  I'm trying to understand DNS a bit better, but I still don't get A and NS records completely. As far as I understood, the A record tells which IP-address belongs to a (sub) domain, so far it was still clear to me. But as I understood, the NS record tells which nameserver points belongs to a (sub) domain, and that nameserver should tell which IP-address belongs to a (sub) domain. But that was already specified in the A record in the same DNS file. So can someone explain to me what the NS records and nameservers exactly do, because probably I understood something wrong. edit: As I understand you correctly, a NS record tells you were to find the DNS server with the A record for a certain domain, and the A record tells you which ip-address belongs to a domain. But what is the use of putting an A and an NS record in the same DNS file? If there is already an A record for a certain domain, then why do you need to point to another DNS server, which would probably give you the same information?

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• How do I configure an ordinary TV remote control to work with lirc on Linux?

  - by Allan Lewis

  I am running MythTV on Ubuntu 9.10 and I would like to use a TV remote to control it. I know that lirc needs a configuration file for the remote, but none of my remotes is in the official database. If I point a remote at the receiver on my TV card (a Pinnacle PCTV "Solo", model 72e) and press a button, dmesg logs the code generated by the remote, so I assume I just have to make a config file with a list of commands assigned to these codes. I've read a few how-tos but I still don't understand exactly how to create the config file. Some of the guides I've read refer to IR receivers on TV cards working at a "higher level of abstraction", which I take to mean that they decode the signal and provide a code, like the ones I can see in dmesg, rather than just giving raw data, but none of them explain where to go from there! Any help would be greatly appreciated!

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• Sudden graphic card change? from Nvidia 8600GT to Nvidia 7050/Nvidia nForce 610i

  - by Ken

  Yesterday I got a virus and I had the Nvidia 8600 gt, as I have had throughout the whole time I had this computer. So I decided to fully format my pc to get rid of the virus. When it was finished, It came up with Nvidia 7050/ Nvidia nForce 610i in my systems and all my games have significantly gone down by fps. Note the driver update that came with the PC that works for Nvidia 8600gt doesnt work anymore, I have tried to download it but it comes with an error message saying that the PC has an incompatible graphics card. Can anyone explain this sudden change? I know for sure I have bought an Nvidia 8600 gt, and not the current one I have.

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• Explanation of command to uppercase the first letter of a filename

  - by hazielquake

  I'm trying to learn to rename files with the command line, and after browsing around a lot of pages I finally found a command that uppercases the first letter of a file, but the problem is that I want to understand the meaning of each command. The command is: for i in *; do new=`echo "$i" | sed -e 's/^./\U&/'`; mv "$i" "$new";done I understand the 'for' kinda... but not the 'echo' or '`' and especially the sed command. if someone has a little patience to explain the meaning of each thing that'd be awesome! Thanks!

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• Freeware Local Proxy for Proxy Chaining with HTTPAUTH

  - by pepoluan

  I am looking for a freeware local proxy to perform proxy-chaining with HTTPAUTH. To explain my situation: In my workplace I am forced to keep switching between several internet-connected apps, and thus everytime I have to type in the credentials (or, at least, click on 'OK' to send my previously-saved credential). To make matters more annoying, the proxy login times out every 30 minutes, requiring me to lather-rinse-repeat the whole annoyance. I'd like to just point them all to a locally installed proxy which will on its own perform the required HTTPAUTH against the corporate proxy. I've tried Cntlm, but it always fail to authenticate (and according to this thread, that is due to the proxy using HTTPAUTH which is not supported by Cntlm) Any suggestions? ETA: I found Polipo, but it's kinda wonky on Windows. Especially if I visit a new URL, and the DNS server is a bit slow, then Polipo will simply drop/refuse the connection. And I have to put my password in plaintext. If there's a better suggestion, I'm all ears.

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• Duplicate pseudo terminals in linux

  - by bobtheowl2

  On a redhat box [ Red Hat Enterprise Linux AS release 4 (Nahant Update 3) ] Frequently we notice two people being assigned to the same pseudo terminal. For example: $who am i user1 pts/4 Dec 29 08:38 (localhost:13.0) user2 pts/4 Dec 29 09:43 (199.xxx.xxx.xxx) $who -m user1 pts/4 Dec 29 08:38 (localhost:13.0) user2 pts/4 Dec 29 09:43 (199.xxx.xxx.xxx) $whoami user2 This causes problems in a script because "who am i" returns two rows. I know there are differences between the two commands, and obviously we can change the script to fix the problem. But it still bothers me that two users are being returned with the same terminal. We suspect it may be related to dead sessions. Can anyone explain why two (non-unique) pts number are being assigned and/or how that can be prevented in the future?

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• Sysprep on Windows 7 for a non-windows admin?

  - by askvictor

  I'm needing to use sysprep to deploy some Windows 7 machines. I can't find any resources that explain this very easily. In particular, I've loaded all of the programs I want for the image onto a computer. If I want to use prepares this for cloning onto 200 other machines, what steps would I need to take? Or do I need to start again, creating the image using 'audit' mode? The machines I'm using come pre-configured from the manufacturer with a host of custom drivers that wouldn't be fun to re-install - I'd rather use their base image to build upon. Cheers, Victor

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• Cannot run setups from a vboxsvr mapped network drive on Windows 7 within VirtualBox

  - by Dimitri C.

  I'm trying to run an application setup by double-clicking the setup.exe from within Windows Explorer. The file is located on a mapped network drive, and I'm using Windows 7. This results in the following error message: The specified path does not exist. Check the path, and then try again. The workaround I found is to copy the installer to the main hard drive (c:) and run it from there; however, this is rather inconvenient. The same action did work on Windows 2000, Windows XP and Windows Vista. I have the impression that the problem only occurs with installers, as everything seemed to work fine with regular exe's. Is there anyone who can explain this odd behavior? Update: After some extended tests I noticed that the problem only occurs with a mapped drive of VirtualBox's "shared folders" (cf. vboxsvr). Mapping an SMB drive works fine.

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• How to set up an SSL Cert with Subject Alternative Name

  - by Darren Oster

  To test a specific embedded client, I need to set up a web server serving a couple of SSL (HTTPS) sites, say "main.mysite.com" and "alternate.mysite.com". These should be handled by the same certificate, with a Subject Name of "main.mysite.com" and a Subject Alternative Name of "alternate.mysite.com". This certificate needs to be in an authority chain back to a 'proper' CA (such as GoDaddy, to keep the cost down). My question is, are there any good tutorials on how to do this, or can someone explain the process? What sort of parent certificate do I need to purchase from the CA provider? My understanding of SSL certificates is limited, but as Manuel said in Fawlty Towers, "I learn...". I'm happy to work in Windows (IIS) or Linux (Apache) (or even OSX, for that matter). Thanks in advance.

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• Does openssl errno 104 mean that SSLv2 is disabled?

  - by David

  I want to check if my server has SSLv2 disabled. I am doing this by attempting to connect remotely with openssl with the following shell command. openssl s_client -connect HOSTNAME:443 -ssl2 Most literature I could find on the Internet says if I see something similar to the following error then SSLv2 is properly disabled. 29638:error:1407F0E5:SSL routines:SSL2_WRITE:ssl handshake failure:s2_pkt.c:428: I do get the above error when connecting to my Ubuntu server with SSLv2 disabled in Apache Apache but when I connect to my Windows Server 2008 R2 server with SSLv2 disabled in the registry I get the following output and error. CONNECTED(00000003) write:errno=104 I can't find any literature explaining this output and error. If anybody could explain to me if and why this output and error means that SSLv2 is properly disabled, I would appreciate it. Thanks!

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• How can I upgrade PHP on Windows 7?

  - by jasondavis

  I am currently running Xampp for a dev server on Windows 7. It has Apache, PHP,MySQL and some other stuff all in one simple exe package for windows and works great. My version currently has PHP version 5.2.9 and the new version of Xampp comes with PHP 5.3.1 I would like to use the newer PHP but I do not want to update everything else. So how would I install the newest version of PHP in windows? Also on the Xampp page there is another extension download for Tomcat 6.0.20 I am not sure what Tomcat does can someone explain?

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• How to create Raid 10 with megacli

  - by Henno

  I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in figuring out the correct command line for creating a raid 10 array. The documentations says that the syntax for creating a raid 10 is: MegaCli -CfgSpanAdd -r10 -Array0[E:S,E:S] -Array1[E:S,E:S] -aN My enclosure ID is 25, so: [root@linux-h5ut ~]# MegaCli -CfgSpanAdd -r10 -Array0[E25:S02,E25:S21] -Array1[E25:S02,E25:S21] WB Cached NoCachedBadBBU -a0 Invalid input at or near token E I have googled high and low but there doesn't seem to be any example doing raid10 with megaraid (only the syntax). Can anyone explain what is wrong?

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• Two Ubuntu Instances (Guest) networking with XP (Host) in virtual box v3.1.4

  - by EnthuCrazy

  So here is my current objective: I need to create two guest instances of Ubuntu Desktop 9.10 in VirtualBox on a WindowsXP host. (This is needed for communications later on.) (this step is almost done) I need to establish networking between all three OS's, the host and two guests (Guest1 - Host - Guest2). I know that generally, to establish networking between Windows host and Ubuntu guest, we set up a bridge connection. But here there are two guests, and primarily I need networking between the two guests (Ubuntu to Ubuntu). So will there need to be a change in tap0 and tap1 interfaces when we set up a bridge, or is there a better way to implement this? Please explain the procedure.

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• Implementing a form of port knocking + Phone Factor = 2 Factor auth for RDP?

  - by jshin47

  I have been looking into how to secure a publicly-available RDP endpoint and want to implement our two-factor authentication RADIUS server, PhoneFactor. I would like to implement the following process: User opens up web app in browser In web app, user enters username + password, initiates RADIUS auth Phone factor calls user to complete auth Once user is authenticated, port 3389 is opened on user's IP on pfSense firewall. After some amount of time, firewall rule is removed for that IP I would like to know the following: Is this a typical setup? If it is a bad idea, please explain why. If it is possible, are there any packages that assist with this? Specifically, the third step, where the appropriate firewall rule would need to be added... Edit: I am aware of TS Web Gateway, but I want the users to be able to use the traditional RDP client...

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• What are the strategies available to minimise badblocks on an encrypted partition?

  - by David Andreoletti

  Let me explain my backup strategy and the problem I am facing. My current backup strategy: Open encrypted container and execute Carbon Copy Cleaner on it at least once a week. Rotate backup disks. Problem: I have an Truecrypt partition on my 1st external hard disk. I recently found out that some files on this encrypted partition cannot be read due to bad blocks (reported by Antonio Diaz's GNU 'ddrescue'). My backup strategy is ineffective in this scenario because bad blocks are discovered during backup. Possible strategy Strategy #0: Have the encrypted partition over a RAID 1 with 2 disks. Is this a suitable strategy ? Strategy #1: Do you think of any other one ? Environment: Mac OS X 10.8 External 2.5" hard disk (SATA) No RAID

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• Google Apps claims my domain is registered but when I try to access it claims it is not

  - by user32953

  Hi all, we have registered one of our domains with Google Apps 2 years ago. However, we didn't even use it. Now if I try to access: http://google.com/a/mydomain.com What I see is: Server error Sorry, you've reached a login page for a domain that isn't using Google Apps. Please check the web address and try again. Then I go to Google Apps Standard Edition signup page and type mydomain.com. However, what I get is: This domain has already been registered with Google Apps. Please contact your domain administrator for instructions on using Google Apps with this domain. Is there anyone who can explain me what this inconsistency is caused by and what I can do? Since Google Apps Standard Edition doesn't grant me to contact with Google, I can't even submit a bug report. Any help would be appreciated.

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• Concatenate cells that change daily automatically?

  - by Harold

  I use concatenate to pull data together from different cells in my spreadsheet. Since my data changes daily, I want the formula to also change daily without having to manually input the new cell in the concatenate formula. I am looking for a way to do this but not sure how. Can anyone out there help me out please!? I appreciate the assistance in advance! Maybe this will help to explain what I need. I have a row of data from D4:AH4 that I insert daily based on the new day. When I use the concatenate and us the following formula: =CONCATENATE(TEXT('Raw Data'!B4,"m/d")," ",TEXT('Raw Data'!C4,"")," ", TEXT('Raw Data'!E4,"0.0%"))... E4 being the cell that changes daily where next day would be F4, G4, etc... All other parts of the formula will stay the same. I hope this helps! Thanks! :)

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• How to make the start menu find a program based on a custom keyword?

  - by Pierre-Alain Vigeant

  I am searching for a way to type a keyword in the start menu Search programs and files field and that it will return the application that match the keyword. An example will better explain this: Suppose that I want to start the powershell. Currently what I can type in the search field is power and the first item that appear is the 64bits powershell shortcut. Now suppose that I'd like ps to return powershell as the first item of the search list. Currently, typing ps return all files with the .ps extension, along with a control panel options about recording steps but not the powershell executable itself. How can I do that?

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• Color Temperature in PowerPoint 2010

  - by Otaku

  I'm teaching PowerPoint 2010 and it's got some great new features. Unfortunately, one that I can't wrap my head around is the the new "Color Temperature" feature for pictures. I do understand color temperature in general (i.e. the lower the number, the "colder"/"oranger" - the higher the number, the "hotter"/"bluer"). The way PowerPoint implements it seems opposite from most other programs - like Photo Filter in Photoshop. So I need to understand what this feature is in more detail so I can explain it to my students. Does anyone know?

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• Port forwarding does not work always?

  - by ITFan

  I opened port 25374, this is eMule TCP port, then I use canyouseeme.org to check if it is really opened. I got the weird problem : when eMule is running, canyouseeme.org see my port. I got the message : "Success: I can see your service on xxx.xx.xxx.xx on port (25374) Your ISP is not blocking port 25374" When I close eMule then check the port again on canyouseeme.org I got : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection timed out But when I turn off the windows firewall I got a different error : Error: I could not see your service on xxx.xx.xxx.xx on port (25374) Reason: Connection refused Can anyone please explain to me why it happened like that and how to make the port always opened ? Thanks

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• SELinux Contexts

  - by Josh

  I am configuring Apache\PHP and noticed Apache complaining about permissions with the php shared object. Starting httpd: httpd: Syntax error on line 206 of /etc/httpd/conf/httpd.conf: Cannot load /usr/lib/httpd/modules/libphp5.so into server: /usr/lib/httpd/modules/libphp5.so: cannot restore segment prot after reloc: Permission denied I looked at the context (started fine with enforcement off) and found: [root@HDSSERVER conf]# ls --lcontext /usr/lib/httpd/modules/libphp5.so -rwxr-xr-x 1 root:object_r:httpd_modules_t root root 15565418 May 10 08:39 /usr/lib/httpd/modules/libphp5.so Shouldn't httpd (apache) be able to access files with a context of httpd_modules_t? I got it fixed by applying chcon -t textrel_shlib_t '/usr/lib/httpd/modules/libphp5.so' But I would think the httpd version would work before this one. Can someone explain this to me?

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• What does drag lock do in boot camp?

  - by MacBookNewb

  In the control panel for my mac book pro I have an icon called Boot camp. Inside there and inside the trackpad tab I have an option called drag lock. It sounds useful to me as I sometimes find it awkward dragging long distances. I can't figure out how to use it though. Can someone explain how I can find out more info on drag lock? I can't find any references on google. Also even without the dragging option on I can drag.

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• Conflicting answers from du with different units

  - by dpitch40

  My question is quite simple. I get this output when checking the total amount of space I'm using on my Walkman. david@Milton:/media$ du -b --max-depth=0 WALKMAN/ 14823290693 WALKMAN/ david@Milton:/media$ du -k --max-depth=0 WALKMAN/ 14523776 WALKMAN/ Last I checked, 14,523,776 KB * 1024 = 14,872,646,624 B, not 14,823,290,693. Dividing the two, their "K" unit seems to be equal to about 1020.62 rather than 1024 as advertised. This is causing some errors in the program I wrote to sync my Walkman, so it fills up faster than it claims to. Can anyone explain this discrepency?

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• right click / pop up using keyboard in osx

  - by sugar

  Yes - I have gone through this & this also. But non of them includes the answer I want. I mean my question is bit different. Let me explain. In windows, to right click any where - or to bring up a pop up menu we just type a key right beside on window key / pop-up key or press Shift + F10 to bring up pop up any where. Similarly, Is there any short-key is available for just bringing pop-up on screen ? Thanks in advance for sharing your knowledge. Sugar.

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