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  • How to secure postfix to find out whether the emails are coming really from the sender?

    - by codeworxx
    Is it possible to secure postfix in a way, that incoming emails are checked on whether the email comes really from the sender? Is that possible to write php script and chose a sender, like the mail is really coming from the sender and what are the possibilities for postfix to find out that this mail is not actually coming from the real sender? What I have found out and activated are the options smtpd_sender_restrictions = reject_unknown_sender_domain unknown_address_reject_code = 554 smtpd_client_restrictions = reject_unknown_client unknown_client_reject_code = 554 Please mention, whether I have missed out on any points!

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  • Scratch disks on solid state drives

    - by Kato
    For something like Final Cut Pro where you have scratch disks, is it absolutely a bad idea to use a solid state drive? There would be a lot of writing, but I'm thinking it would be less for video editing then say, programming? The read/write cycles for SSDs still seem pretty long...

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  • Initrd and Initramfs

    - by nitins
    I have read about the differences between the two from stackoverflow. But I am still finding it difficult to understand tmpfs and the real advantages of initramfs over initrd. I find that on RedHat EL 5 or Ubuntu 12.04, I have only initrd files in /boot. However RedHat EL 6 has both intird and intramfs files. Does that mean only Redhat 6 has implemented intiramfs and we still have initrd image there?

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  • outlining in colors

    - by John
    ? I like outlining all information, but I am looking for better way to outline: I would like my outlines to be colorful like programming, so that it is very easy to distinguish between different types of texts within an outline. How can I do this?

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  • Is it possible/advisable to run VMware Server ESX/ESXi on a laptop?

    - by cletus
    The idea of having a small footprint hypervisor as the primary OS on a laptop or desktop where every "real" OS is a guest appeals to me. Now I realize this software is more typically used on blades and the other servers but can it be done on a normal PC? Should it be? What requirements are there (eg hardware/BIOS/chipset)? Is there a performance impact for doing so? Is it a good/bad idea?

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  • Ubuntu hardware compatability

    - by CT
    I have only previously played with ubuntu using virtual machines with VMware Fusion. So everything just sort of worked. I've never had to install any drivers. I'm considering putting it on some real hardware and using it as a media center. What should I be looking for as far as checking hardware compatibility? How does installing drivers work? Any quick and easy recommendations / guides?

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  • Always route a keypress to an application regardless of focus

    - by George Mauer
    I have to transcribe some audio (not enough to download dedicated software but enough to put my hacker hat on) and flipping back and forth between vlc and my text editor every time I want to pause is really annoying. Is there a way to always route a key-press (for example F10) to vlc regardless of what window has focus. Bonus - I have a Makey Makey so if I can get this working I can create a pedal and it will be my first real use of it!

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  • Vulnerability research. Is it really research?

    - by Benjamin
    IT security people often say they do "vulnerability research". They defend the idea that they actually are doing some kind of "research". But is searching for vulnerabilities in software real research? A geologist looking for mines in the desert is doing "exploration", not "research".

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  • Will spreading your servers load not just consume more recourses

    - by Saif Bechan
    I am running a heavy real-time updating website. The amount of recourses needed per user are quite high, ill give you an example. Setup Every visit The application is php/mysql so on every visit static and dynamic content is loaded. Recourses: apache,php,mysql Every second (no more than a second will just be too long) The website needs to be updated real-time so every second there is an ajax call thats updates the website. Recourses: jQuery,apache,php,mysql Avarage spending for single user (spending one minute and visited 3 pages) Apache: +/- 63 requests / responsess serving static and dynamic content (img,css,js,html) php: +/- 63 requests / responses mysql: +/- 63 requests / responses jquery: +/- 60 requests / responses Optimization I want to optimize this process, but I think that maybe it would be just the same in the end. Before implementing and testing (which will take weeks) I wanted to have some second opinions from you guys. Every visit I want to start off with having nginx in the front and work as a proxy to deliver the static content. Recources: Dynamic: apache,php,mysql Static: nginx This will spread the load on apache a lot. Every Second For the script that loads every second I want to set up Node.js server side javascript with nginx in te front. I want to set it up that jquery makes a request ones a minute, and node.js streams the data to the client every second. Recources: jQuery,nginx,node.js,mysql Avarage spending for single user (spending one minute and visited 3 pages) Nginx: 4 requests / responsess serving mostly static conetent(img,css,js) Apache: 3 requests only the pages php: 3 requests only the pages node.js: 1 request / 60 responses jquery: 1 request / 60 responses mysql: 63 requests / responses Optimization As you can see in the optimisation the load from Apache and PHP are lifted and places on nginx and node.js. These are known for there light footprint and good performance. But I am having my doubts, because there are still 2 programs extra loaded in the memory and they consume cpu. So it it better to have less programs that do the job, or more. Before I am going to spend a lot of time setting this up I would like to know if it will be worth the while.

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  • How can I see a visual overlay of shortcut keys I've pressed?

    - by lyricsboy
    I've seen several screencasts (recorded on Mac OS X) which show a nice little "toast" indicating which shortcut key is being pressed by the screencaster, typically in the middle of the screen. Is this a feature of the screencasting software? Is there an app that does this that stands alone? I regularly do presentations for programming classes, and I want a way to show my audience what shortcuts I'm activating.

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  • Create and manage child name servers (glue records) within my domain?

    - by basilmir
    Preface I use a top level domain provider that only allows me to add "normal" third-party name servers (a list where i can add "ns1.hostingcompany.com" type entries... nothing else) AND "child name servers" which i can later attach to my parent account ( ns1.myowndomain.com and an ip address). They do not provide other means of linking up. I want to host my own server and dns, even with just one name server (at first). My setup: Airport Extreme - get's a static ip address from my ISP Mac Mini Server - sits behind the Airport and get's a 10.0.1.2 My problem is that i can't seem to configure DNS correctly. I added a "child nameserver" with my airport's external static ip address at the top level provider, so to my understanding i should have all DNS traffic redirected to my Airport. I've opened port 53 UDP to let the traffic in. Now, what i don't get is this. My Mini Server is sitting on a 10.0.1.2 address and i have setup dns correctly, with an A record to point and resolve my server AND a reverse lookup to that 10.0.1.2. So it's ok for "internal stuff". Here is the clicker... How, when a request comes from the exterior for a reverse lookup, does the server "know" ... well look i have everything in 10.0.1.2 but the guy outside needs something from my real address. I can't begin to describe the MX record bonanza... How do i set this "right"? Do i "need" my Mini Server to sit on the external address directly (i can see how this could be the preferred solution, being close to a "real" server i have in my mind). If not... do i need a PTR record on the 10.0.1.2 server but with the external address in there? My dream: I will extend this "setup" with multiple Mini's in different cities where i work. I want a distributed something (Xgrid comes to mind). PS. Be gentle, i've read 2 books and the subject, and bought both the Lynda Essentials and DNS and Networking to boot, still i'm far from being on top of things.

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  • Automake thumbnail

    - by Webmaster
    What I need to do is a program that given (as a command line argument) a directory with more directoreies inside, and 4 Pics inside of each dir, the program makes a thumbnail of the 4 files and glues them together (2 rows, 2 columns) and renames that image to the name of the directory. I think it could be done with a combination of a program and shell scripting (I'm experienced in M$, but new to linux). Some real examples would be great. Thanx in advance

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  • How do I mirror a MySQL database?

    - by user45745
    I'm running two load balanced servers for one website, and I'd like the databases to be synchronized. Queries may be run on either of the two servers because they are both production sites, so the replication can't just work one way. It doesn't have to be in real-time, just fairly accurate so people don't notice a difference when they get switched to a different server.

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  • md5sum or sha1sum of legitmate microsoft system files

    - by martyvis
    Is there a database or repository of the legitimate checksums for Microsoft system files? We think we have a 0day on DNS for Windows 2003 SP2 using IRC for command and control. (Latest McAfee does not see an issue). I want to compare our customer's dns.exe and associated DLLs with the real ones. (I will grab a fresh SP2 and hotfixed system to do this, but wonder how to do this in future without needed to do this.)

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  • Text to speech during IPhone call

    - by Jonathan
    Is there way to be able to type instead of speak during an iPhone call. For example when you text a landline (in the uk at least) the text message will be converted to speech. I would like to be able to do a similar thing in real time on my iPhone to another mobile. For example it would be useful for a mute person who can not speak to be able to "participate" in phone calls.

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  • How to use dedicated video card instead of onboard?

    - by Mathias Lykkegaard Lorenzen
    Hi there! I tried running DxDiag (DirectX diagnostics), and I noticed that my graphics card is set to the onboard one that comes with the Core i5 processor (some Intel HD stuff). On my computer, I also have a dedicated graphics card (an Nvidia 310). No serious gaming stuff, I know - just for programming. However, I would still love to know how to switch to that dedicated graphics card instead. My laptop is an MSI CX720.

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  • how to check if your isp does video throttling?

    - by bbaja42
    I've recently changed isp; and noticed that I no longer can watch video sites like youtube in real time; I need to wait for buffering first. In both ISPs, my speed was same 5 megabits per second. I've checked normal download of files, and torrents, and they all work fine. Also, checked other video sites, same problem. Used other pc, same problem

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  • Network Switch fast eneogh for Dlink DIR-655

    - by Recursion
    I am setting up a server and want to keep it outside of my local network which is inside of the Dlink 655 router. I originally bought the dlink router mainly because it is fast, much faster than any other consumer router I have tried. The only router which is capable of real 10MB/s d download speed. I need a switch which will not cause a bottle neck to the router. The switch will connect the to the server and the dlink router.

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  • linux shell utils: convert a list of hex to list of decimals

    - by osgx
    Hello How can I convert a file with a lot hex numbers into the decimal? Example: file1 0x59999 0x5acdc 0xffeff I want to start $ cat file1 | util | cat file2 and get file2 with smth like 1021489 1249230 3458080 (numbers in example output are random, as I cant convert so long hex to dec) Upd: perl : perl -pe '$_=hex;$_.="\n"'. Can anybody do it better? The real task is a sorting of hex numbers.

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  • How to disable auto recover?

    - by user70010
    I've tried disabling "Save AutoRecover information" option, but to no avail. The window "Excel has recovered the following files" still pops up at the start. Any other ideas? UPD Auto-recover window is shown each start after I terminate Excel during my debug session. All file entries Excel shows in the auto-recover window are dated by year 1601. I checked Excel auto-recover folder, and there is no any real file there.

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  • MSSQLServer2008\Instance, Why?

    - by Ice
    Hi, im aware of the possibility to create instances but i don't know a real good reason to do it. This way one has per definition at least two sqlserver services running, but what for should this be good? The two instances have to share all the ressouces mainly the RAM. If you have to rename the server you will end up with an access like \NEWSQLServer\OldInstanceName. So what is the case for instances?

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