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• What are some topics you'd like to see covered in an 'Introduction to Network Security' book?

  - by seth.vargo

  I'm trying to put together a list of topics in Network Security and prioritize them accordingly. A little background on the book - we are trying to gear the text towards college students, as an introduction to security, and toward IT professionals who have recently been tasked with securing a network. The idea is to create a book that covers the most vital and important parts of securing a network with no assumptions. So, if you were a novice student interested in network security OR an IT professional who needed a crash course on network security, what topics do you feel would be of the upmost importance in such a text?

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• Automatically insert cell references from one sheet into other in Calc

  - by user123456

  I have spreadsheets in OpenOffice.org Calc that consist of the first sheet and an arbitrary number of additional sheets, each collecting data for a specific month. The Month sheets have an identical structure. The first sheet is supposed to provide an overview to the most important numbers in the month sheets. Whenever I add a Month sheet, I want it to appear automatically in the Overview sheet with the structure given below. So, for each Month sheet, copy or reference some of the cells into the Overview sheet: {Referenced Sheet Name} | Fixed Header1 | Fixed Header2 | Fixed Header3 Fixed Label 1 | {CellRef 1} | {CellRef 2} | {CellRef 3} Fixed Label 2 | {CellRef 4} | {CellRef 5} | {CellRef 6} I know how do to this for just one sheet by hand, but I have no clue how to make Calc do this automatically for me. Is it possible at all? Any help appreciated.

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• Can an external server be used to encrypt all traffic

  - by Pasta

  My work takes me to a number of places with WiFi connection. I want to be able to encrypt the traffic between my laptop and the internet. Can I do this with a VPN server? What is the best way to get this done? Is there a secure and reliable service that will help me do this? This is fairly important and might be shared by upto 2 people at a time. Is it better to get a server setup on a cloud hosting solution? Amazon?

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• Can I set up OpenVPN on two or more machines so that they can each act as client and server?

  - by ianfuture

  The question summarises what I want to achieve. In more detail: I have a Windows XP Pro PC at a work location that I want to be able to access my home Windows XP Pro PC and other home computers from. But I also want to be able to connect to the work PC from home. I think the term generally used is a "mesh" network. Can I do this with OpenVPN ? If so how would I do it? What are the most important things to remember to do? EDIT: The work Windows XP Pro PC is largely managed by IT Dept, I do have local admin rights to install things. Some settings are disabled. My main concern was firewalls and port forwarding on the work PC. Any suggestions?

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• How to Fix Mail Server SSL?

  - by Noah Goodrich

  Our mail server was originally setup using self-created certificates, however when those expired and I tried to recreate them, the whole thing just blew up. Since I know it will be important, we are running a Debian server and Postfix. Now I see these errors generated in the mail logs: May 15 08:06:34 letterpress postfix/smtpd[22901]: warning: cannot get certificate from file /etc/postfix/ssl/smtpd.cert May 15 08:06:34 letterpress postfix/smtpd[22901]: warning: TLS library problem: 22901:error:02001002:system library:fopen:No such file or directory:bss_file.c:352:fopen('/etc/postfix/ssl/smtpd.cert','r'): May 15 08:06:34 letterpress postfix/smtpd[22901]: warning: TLS library problem: 22901:error:20074002:BIO routines:FILE_CTRL:system lib:bss_file.c:354: May 15 08:06:34 letterpress postfix/smtpd[22901]: warning: TLS library problem: 22901:error:140DC002:SSL routines:SSL_CTX_use_certificate_chain_file:system lib:ssl_rsa.c:720: May 15 08:06:34 letterpress postfix/smtpd[22901]: cannot load RSA certificate and key data And when trying to access email from a client like Thunderbird from outside our local network, you receive "Unable to connect to smtp server". Update: I have verified that the file does exist. The current owner of the file is root:root. Does this need to be changed?

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• Will my laptop be ok with this different laptop charger?

  - by tidbits

  So the original laptop charger broke and I switched to a charger from a laptop that I no longer use. The specifications from each are: Original Input:AC 100-240V 1.5A 50-60Hz Output: DC 19V 3.42A Other Charger Input: AC 100-240V 1.5A 50-60Hz Output: 20V 3.25A Yes, the polarity is the same. Also, the wattage has a difference of .02 from what I understand. Is wattage ever important, and more specifically, a wattage difference of that size. Feel free to ask me any other questions about the chargers and I'll answer them to the best of my ability.

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• Problem to connect to MySQL server (error #2002) in PHP

  - by Martin

  I installed ZWAMP 1.0.7 (on Windows 7), but I'm having a weird problem. I can't connect to my MySQL server from any PHP script. If I try to use MySQL command line everything works fine but PHPMyAdmin retruns error #2002. I'm not sure whether it's important or not but MySQL server is not able to create socket file. I don't know what's the problem but I think everything is configured in my.cnf properly. Do you have any ideas?

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• Is there a free-embedded SSH solution ?

  - by ereOn

  Hi, I'm working for an important company which has some severe network policies. I'd like to connect from my work, to my home linux server (mainly because it allows me to monitor my home-automated installation, but that's off-topic) but of course, any ssh connection (tcp port 22) to an external site is blocked. While I understand why this is done (to avoid ssh tunnels I guess), I really need to have some access to my box. (Well, "need" might be exagerated, but that would be nice ;) Do you know any web-based solution that I could install on my home linux server that would give me some pseudo-terminal (served using https) embedded in a web page ? I'm not necessarily looking for something graphical: a simple web-embedded ssh console would do the trick. Or do you guys see any other solution that wouldn't compromise network security ? Thank you very much for your solutions/advices.

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• Huge email sizes when using mail merge in Word 2010

  - by Nic

  So I've designed an HTML template to send out some emails on. The code is fine, everything looks great there, and it tests just fantastically. I was sending out putting my recipients in the BCC field, but I decided to make it a little more personal and open the file in Word and do an email merge. The HTML file itself is 3.06kb and contains an img src to an absolute URL, which is about 125kb (a little large, I know, but it's very important). When I merge the file from Word 2010 - Outlook 2010, the email size jumps to about 250kb. It's not much, I know, but I'm a gigantic nerd and I'm stuck thinking it should be about 5kb with MIME overhead. Here's the file list on one of the test emails: File Size image001.png 104366 image002.gif 43 MESSAGE 1259 Mime.822 152575 TEXT.htm 5712 Since the img src is specified, I'm not sure why these are coming through. If this is an issue inherent to Outlook, I'd be happy to explore other options.

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• vncserver too many security failures

  - by cf16

  I try to connect to my vncserver running on CentOs from home computer, behind firewall. I have installed Win7 and Ubuntu both on this machine. I have an error: VNC conenction failed: vncserver too many security failures even when loging with right credentials (I reset passwd on CentOs). Is it something regarding that I try as root? I think important is also that I have to login to remote Centos through port 6050 - none else port works for me. Do I have to do something with other ports? I see that vncserver is listening on 5901, 5902 if another added - and I consider connection is established because from time to time (long time) the passwd prompt appears,... right? please help, what to do? even if prompt appeared and I put correct password I get: authentication failure. how to disable this lockout for a testing purposes?

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• All my folders and files on my flash drive have been renamed automatically and I can no longer open them... I need those files

  - by jennifer

  I opened up my flash drive this morning and all of my folders and files are normal, except for one folder and all its included files, which is the most important folder. The subfolders and files are renamed with bizarre characters and when I click to open them, a pop-up appears saying it's not accessible and the filename or directory name is incorrect. I don't want to reformat the flash drive because I'd lose all those files. Is there a way for me to restore it or something? I would attach a screen shot, but apparently new users do not have that privilege. If you have a vague idea of what I'm talking about, let me know and I can email you screenshots so you can have a better understanding. Any help is greatly appreciated!

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• Changing default shortcut for Spaces on a Macbook Pro with Snow Leapord?

  - by Mahmoud Abdelkader

  I'm primarily a Linux user but my main home PC is a Macbook Pro with Snow Leopard. The concept of "Spaces" in a Mac is extremely important to how I utilize my development environments and I use this feature on Linux all the time. I use Compiz Manager for Ubuntu which allows me to "Desktop Switch" and navigate all desktops using the Ctrl+Alt+Arrow keys to a particular desktop. On a Mac, the process is similar, however, you're only given 3 non-customizable short-cuts: Option+Arrow, Ctrl+Arrow, and Alt+Arrow. How can I change the keyboard shortcut to take Ctrl+Option? The keys would then fit my working style and it won't feel awkward to remember two sets of keyboard shortcuts. Thanks! Mahmoud

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• Cheapest server per gigabit throughput [closed]

  - by nethgirb

  I'm looking for a set of servers for performance testing a network, and secondarily testing some applications on the servers. Their most important task is simply to pump out data: from an application like memcached or just dumped from a large file in memory into a TCP flow (i.e., disk performance doesn't matter). This should happen over one or more 1 gigabit Ethernet ports, and the machines should run Linux (ideally), or perhaps Mac OS X or some other *nix. Other than that, there are few constraints (e.g., even something ARM-based could be fine). So here's the question: What's the cheapest server per gigabit? Price and power are both considerations.

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• Sending email from an alternative domain to protect my "core" domain from spam filters

  - by Jack7890

  I run a website (seatgeek.com) that sends a lot of transactional email to users--account updates, alerts, etc. It's important to us that our domain remains clean in the eyes of spam filters. We'd like to roll out an email marketing campaign. It's nothing particularly spammy, but this would be the first time we ever emailed to people who hadn't expressly asked to receive email from us. It's to market a new product we built to a specific niche of professionals. In order to protect our domain in the eyes of spam filters, we're considering sending the marketing email from an alternative domain. The alternative domain is an alternative landing page we sometimes use for this new product. Is there any way this could backfire on us? Does it seem like a particularly poor idea?

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• Considerations for a business looking to transition from PSTN to IP Telephony

  - by Bryce Thomas

  Full disclosure - This is related to a homework assignment question. I am not asking you to do my work for me, I am merely looking for some pointers and considerations to direct me in my further research. I have an assignment I'm working on where I've been given a scenario where a business wants to look into transitioning to using "Internet Telephone" as opposed to a traditional PSTN/PBX system and I need to write a report on it. I'm after some high level pointers from people, especially anyone that has been involved in a real life transition of this nature, on what some of the most important considerations are. These can be financial considerations, initial setup considerations, ongoing administrative considerations, quality of service considerations or anything else that is pertinent to performing such a transition.

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• How to edit CSV file without changing or formatting values (ideally in Neo/Open-Office)?

  - by Scott Saunders

  I often need to edit CSV files that will later be imported into databases. I need to reorder columns, change values, delete lines, etc. I use NeoOffice for this now - it's basically Open Office with some Mac UI stuff tweaked. Often, though NeoOffice tries to be "helpful" and reformats fields it thinks are dates, rounds numbers to some number of decimals, etc. This breaks the file import and/or changes important data values. How can I prevent this from happening? I need to edit the fields exactly as they would appear in a text editor, with absolutely no changes to the data in the fields.

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• Server room kit?

  - by Bill Weiss

  I feel like this is a question I've seen on here before, but some searching didn't do me any good. This looks similar, but I'm looking for stuff I leave there, not what's in my go-bag. What would you say is indispensable equipment in your server room? I've inherited one that's a bit light on stuff (except for servers, those are in there). We're in the single digits of racks, if that matters. I'm thinking of things like: Cable labeler Ethernet tester (copper at least, fibre if you need) ... ? Community wiki, because, really. [Edit] I suppose it's important to say that it's a colo facility, kind of far from the office. No food, water, etc. :(

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• How to setup a django site with Cherokee, DynDNS and virtual_env?

  - by e-satis

  I have a django project running with the dev server, and would like to try run it in a production environment. I wanted to try Cherokee for a change, so I installed it. We don't have a domain name yet, so I set up a DynDNS looking like stuff.gotdns.org. It works fine, I can see the Cherokee welcome page (so red, I first believed I got an error :-p). I ran the wizard to create a new virtual server for Django. No everything is setup, but I have nothing. Still the default Cherokee welcome page. What should I do now if I want to go to "http://stuff.gotdns.org" and see my website? What should I do now if I next want to make it available only at "http://project.stuff.gotdns.org"? Important fact, I use virtual_env, so your can call Python directly, you have to activate it first.

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• How to recover deleted files?

  - by vijay.shad

  Hi My laptop has two os. one is windows vista. and other is Ubuntu. I am currently on ubuntu system, this is my primary OS. There are 4 partitions of my hard disk Windows OS Linux(Ubuntu OS) Data Now the problem part. The data partition is NTFS. I have mounted this partition on the location /media/windrive-a under ubuntu OS. A little while back i decided to delete the mounting of the data partition and i fired command rm -r /media/windrive-a/. To give me a shock; all my data on data drive is gone. Now, I know this is not the command to remove mounted partition. But I have committed the wrong. Is there any way i can get my data back. These are very important data for me. Please suggest.

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• Make cloudera-vm work on Oracle VM VirtualBox

  - by ????? ????????

  I downloaded this and the instructions say: Important: You must enable the I/O APIC in order to use 64-bit mode. (See http://www.virtualbox.org/manual/ch03.html.) On newer versions of VirtualBox, it may default to using SATA as the disk interface. This can cause a kernel panic in the VM. Switching to the IDE driver solves this problem. I am running this on Red Hat 64-bit mode (I've also tried on Ubuntu 64-bit with the same result). I pointed to the cloudera-vm image as a startup disk for the VM. I am getting this message: Failed to open a session for the virtual machine ClouderaDevelopment. VT-x features locked or unavailable in MSR. (VERR_VMX_MSR_LOCKED_OR_DISABLED). Result Code: E_FAIL (0x80004005) Component: Console Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb} Does anyone know what I am doing wrong?

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• What are the consequences of giving an AD domain differing NetBIOS and DNS names?

  - by Newt

  In the past, when creating AD domains, I've used the common convention of using a sub-domain of the company's publicly registered domain name, e.g "corp.mycompany.com" or "int.mycompany.com". I've always accepted the default NetBIOS name when running DCPromo, for fear that creating a NetBIOS name that differs from the sub-domain may cause complications. I've recently been doing a bit of research on the consequences of providing an alternate NetBIOS name. The main reasons behind this are: The NetBIOS name isn't particularly descriptive or unique to the company Apparently generic NetBIOS names such as "CORP" or "INT" can cause issues when merging IT systems (although I've not had experience with this myself) Providing something "before the slash" that means more to users (less important) In looking at the possible downsides, the only one I can come up with is the disjointed namespace issue when configuring Exchange. Can anybody with more experience than I elaborate on my findings at all? Many thanks

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• Setting up D-link AP2100 as a repeater

  - by Mersan

  Hi, I have two D-Link AP2100, one is connected to a switch (with cable). The second one I would like to use as a repeater, using the WiFi connection to the first and not connected to the switch. Does anyone know first if this is possible, and second and most important, how does one do it. I have tested to set the second AP in repeater-mode, and it is connected to the first, I have full strength to the second one, but I'm not receiving any IP från the DHCP-server, so no access out. Any ideas? /Mersan

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• Problem to connect to MySQL server (error #2002) in PHP

  - by user41514

  Hello, I installed ZWAMP 1.0.7 (on Windows 7), but I'm having a weird problem. I can't connect to my MySQL server from any PHP script. If I try to use MySQL command line everything works fine but PHPMyAdmin retruns error #2002. I'm not sure whether it's important or not but MySQL server is not able to create socket file. I don't know what's the problem but I think everything is configured in my.cnf properly. Do you have any ideas?

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• How does "Compatability Mode" in Windows 7 affect the application?

  - by Robert C. Cartaino

  Background: Based on the answer given to this question: "Skype behaviour in the Windows 7 Superbar" ...you can get Skype to minimize to the system tray (rather than the task bar) by running it in compatibility mode. (red flags going off in my head) That's the behavior that I want but what does "compatibility mode" do to the executing application? I am concerned about changing the execution mode of an entire (important) application to a previous generation just to alter the user interface behavior a bit. So, what does compatibility mode actually do internally? What are the disadvantages, as in "how could the application (Skype) suffer?"

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• Extracting metadata from flac header in linux

  - by Tommy Fisk

  Hello. I recently (and accidentally) wiped a hard-drive which should NOT have been formatted. Thankfully, PhotoRec was able to recover some of the most important files from the disk. Part of those files include a large music collection of flac files. I've placed these in a folder named 'FLAC' that looks like this: [Start of FLAC Folder] f11655088.flac f11698672.flac ... (around 2,000 files total) f291142600.flac [End of FLAC Folder] I'm running a livecd to rescue this data. I have access to a standard terminal in Ubuntu 10.10. I've noticed that the music player in linux will display the song title when I open any of these songs. My goal is to automatically extract the song title from these files and update their names from f12313512.flac to 'Libera - Rebirth.flac' - or whatever the song title happens to be. Thanks in advance for suggestions on how I might accomplish this!

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