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• What is the "in-the-wire" size of a ethernet frame? 1518 or 1542?

  - by chrisapotek

  According to the table here, it says that MTU = 1500 bytes and that the payload part is 1500 - 42 bytes or 1458 bytes (<- this is actually wrong!). Now on top of that you have to add IPv4 and UDP headers, which are 28 bytes (20 IP + 8 UDP). That leaves my maximum possible application message to as 1430 bytes! But by looking for this number in the Internet I see 1472 instead. Am I doing this calculation wrong here? All I want to find out is the maximum application message I can send over the wire without the risk of fragmentation. It is definitely not 1500 because that includes the frame headers. Can someone help? The confusion is the the PAYLOAD can actually be as large as 1500 bytes and that's the MTU. So now what is the size in-the-wire for a payload of 1500? From that table it can be as big as 1542 bytes. So the maximum app messages I can send is 1472 (1500 - 20 (ip) - 8 (udp)) for a maximum in the wire size of 1542. It amazes me how things can get so complicated when they are actually simple. And I have not clue how someone came up with the number 1518 if the table says 1542.

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• How do I lower the hardware volume? (volume too high)

  - by Zom-B

  I have a 4yo Dell laptop with Windows XP Pro (modern ones unfortunately don't have a physical volume knob), and lately I'm using my Apple earphones, because they have much better low frequency response than my $10 earphones. They also have the side effect of being much louder. To give an indication of my agony, for most tasks (movie, music, games) I have my main volume at 3 ticks: drag to 0 with the mouse and press the up key 3 times (the handle does not even raise 1 pixel) and my wave volume at 50%. I notice that when I do this, I have a lot of digital noise, because I'm using just a tiny fraction of the 16-bit space. If I drag the Wave slider down until I barely hear the audio, it becomes really distorted and noisy, indicating that this is digital volume (in the DirectSound driver or something) and not hardware volume. I experimented in Audition. When I make a tone of 1000Hz at -50db, (all windows volumes at max) the volume is just below my pain threshold. When I zoom in to see how high the sample values reach, I see that just 8 of the 16 bits are used (about -100 ~ 100). When I generate such tone at -80db (minimum I can specify) then I can still clearly hear the tone, although really noisy. When I zoom in, I see that just 3 out of 16 bits are used. I created a squarewave tone that is just 1 bit high, and I can still hear it! For most uses, this is not a big problem (audiophiles will disagree!), as I just have more noise than usual (about the same as old 8 bit hardware), but I'm also in the process of programming a hearing test program, in which case this problem is a death blow as the test subjects will even hear tones at the bottom of the theoretical range (lowering the windows volume is futile, see above) (I cannot update drivers, as Dell has discontinued XP support for my model)

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• Unable to resize ec2 ebs root volume

  - by nathanjosiah

  I have followed many of the tutorials that pretty much all say the same thing which is basically: Stop the instance Detach the volume Create a snapshot of the volume Create a bigger volume from the snapshot Attach the new volume to the instance Start the instance back up Run resize2fs /dev/xxx However, step 7 is where the problems start happening. In any case running resize2fs always tells me that it is already xxxxx blocks big and does nothing, even with -f passed. So I start to continue with tutorials which all basically say the same thing and that is: Delete all partitons Recreate them back to what they were except with the bigger sizes Reboot the instance and run resize2fs (I have tried these steps both from the live instance and by attaching the volume to another instance and running the commands there) The main problem is that the instance won't start back up again and the system error log provided in the AWS console doesn't provide any errors. (it does however stop at the grub bootloader which to me indicates that it doesn't like the partitions(yes, the boot flag was toggled on the partition with no affect)) The other thing that happens regardless of what changes I make to the partitions is that the instance that the volume is attached to says that the partition has an invalid magic number and the super-block is corrupt. However, if I make no changes and reattach the volume, the instance runs without a problem. Can anybody shed some light on what I could be doing wrong? Edit On my new volume of 20GB with the 6GB image,df -h says: Filesystem Size Used Avail Use% Mounted on /dev/xvde1 5.8G 877M 4.7G 16% / tmpfs 836M 0 836M 0% /dev/shm And fdisk -l /dev/xvde says: Disk /dev/xvde: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x7d833f39 Device Boot Start End Blocks Id System /dev/xvde1 1 766 6144000 83 Linux Partition 1 does not end on cylinder boundary. /dev/xvde2 766 784 146432 82 Linux swap / Solaris Partition 2 does not end on cylinder boundary. Also, sudo resize2fs /dev/xvde1 says: resize2fs 1.41.12 (17-May-2010) The filesystem is already 1536000 blocks long. Nothing to do!

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• How to minimize the risk of employees spreading critical information?

  - by Industrial

  Hi everyone, What's common sense when it comes to minimising the risk of employees spreading critical information to rivalling companies? As of today, it's clear that not even the US government and military can be sure that their data stays safely within their doors. Thereby I understand that my question probably instead should be written as "What is common sense to make it harder for employees to spread business critical information?" If anyone would want to spread information, they will find a way. That's the way life work and always has. If we make the scenario a bit more realistic by narrowing our workforce by assuming we only have regular John Does onboard and not Linux-loving sysadmins , what should be good precautions to at least make it harder for the employees to send business-critical information to the competition? As far as I can tell, there's a few obvious solutions that clearly has both pros and cons: Block services such as Dropbox and similar, preventing anyone to send gigabytes of data through the wire. Ensure that only files below a set size can be sent as email (?) Setup VLANs between departments to make it harder for kleptomaniacs and curious people to snoop around. Plug all removable media units - CD/DVD, Floppy drives and USB Make sure that no configurations to hardware can be made (?) Monitor network traffic for non-linear events (how?) What is realistic to do in a real world? How does big companies handle this? Sure, we can take the former employer to court and sue, but by then the damage has already been caused... Thanks a lot

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• Is it ok to share private key file between multiple computers/services?

  - by Behrang

  So we all know how to use public key/private keys using SSH, etc. But what's the best way to use/reuse them? Should I keep them in a safe place forever? I mean, I needed a pair of keys for accessing GitHub. I created a pair from scratch and used that for some time to access GitHub. Then I formatted my HDD and lost that pair. Big deal, I created a new pair and configured GitHub to use my new pair. Or is it something that I don't want to lose? I also needed a pair of public key/private keys to access our company systems. Our admin asked me for my public key and I generated a new pair and gave it to him. Is it generally better to create a new pair for access to different systems or is it better to have one pair and reuse it to access different systems? Similarly, is it better to create two different pairs and use one to access our companies systems from home and the other one to access the systems from work, or is it better to just have one pair and use it from both places?

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• How do you backup your own files? [on hold]

  - by Antonis Christofides

  I'm a system administrator and I use rsnapshot to backup some servers, duplicity for some others. Both work fine, each one with advantages and disadvantages. Despite that, I am at a loss on how to backup my own private files. I'd use duplicity to automatically backup my files to a remote server; but the problem is that once in a while I must do a full backup. My emails and important files are 9G, and I expect this to increase. Uploading through aDSL at 1Mbit would be 20 hours. Too much. rsnapshot doesn't require periodic full backups (only the first time), but it must be running on the remote server and have a means to connect to my computer; if the server is compromised (or simply if the NSA decides to use it), my own machine is also compromised. Not good. The only solution I've come up with is use encfs, use unison to synchronize the files to a remote server, and use duplicity or rsnapshot on the remote server to backup these files. In that case, the question is whether I can sync the files on many computers; is it possible for encfs to be used with the same key on many computers? I also think that if I append one character to the unencrypted file, its encrypted encfs counterpart might change a lot, so that incrementals with duplicity would be less efficient—but not a big deal. Maybe also, when I need to restore a file, finding the correct file to restore could be a pain, because of filename encryption. I wonder whether there is any other possibility that I've overlooked. Maybe I'm asking too much for my personal use, and I should settle with an external disk?

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• Windows 8 preinstall downgrade to Win 7: UEFI problems :/

  - by Tim Flemming

  I have a friend who has a Hp Laptop with UEFI booting. He locked himself out of windows 8 (forgot his password)... so he called me. Well after trying to use the latest version of chntpw in UBCD5.2.6, i came to the conclusion i needed to wipe the drive and install windows 7. A little googling suggested using certain versions of chntpw, but i decided to not waste the time burning endless CDs. Anyway, He agreed to installing Win7 "I hate the big tile thingys". So i attacked with Gparted. Wiped the whole drive. Set flags to boot. Set part table as MBR. However upon trying to install win7, it still claimed i had a GPT style disk. unable to install. the only thing i can think of I'm doing wrong is not changing the bios/UEFI to legacy... My question is, If I enable legacy, somehow get the drive to actually be MBR, and use my X86 DVD, should I be good? Is there some common glitches ppl miss when dealing with GPT/EFI/UEFI? I need answers cuz he now has a blank laptop which I am responsible for. Another question. windows 8 came installed on a GPT disk. SO WHY WHEN I BOOT THE INSTALL DVD DOES IT SAY IT CANT INSTALL TO A GPT STYLE DISK??? WTF??? talk about the bleeding edge man.

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• How to secure an Internet-facing Elastic Search implementation in a shared hosting environment?

  - by casperOne

  (Originally asked on StackOverflow, and recommended that I move it here) I've been going over the documentation for Elastic Search and I'm a big fan and I'd like to use it to handle the search for my ASP.NET MVC app. That introduces a few interesting twists, however. If the ASP.NET MVC application was on a dedicated machine, it would be simple to spool up an instance of Elastic Search and use the TCP Transport to connect locally. However, I'm not on a dedicated machine for the ASP.NET MVC application, nor does it look like I'll move to one anytime soon. That leaves hosting Elastic Search on another machine (in the *NIX world) and I would probably go with shared hosting there. One of the biggest things lacking from Elastic Search, however, is the fact that it doesn't support HTTPS and basic authentication out of the box. If it did, then this question wouldn't exist; I'd simply host it somewhere and make sure to have an incredibly secure password and HTTPS enabled (possibly with a self-signed certificate). But that's not the case. That given, what is a good way to expose Elastic Search over the Internet in a secure way? Note, I'm looking for something that hopefully, will not require writing code to provide shims for the methods that I want (in other words, writing forwarders).

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• Some of my keys are automatically being pressed along with other keys

  - by Santosh

  History The last time when my computer shutdown was a power failure. Now some keys are automatically being pressed when I type something. The last thing I did to keyboard setting was adding a keyboard layout (on Ubuntu). What is happening Whenever I press c, xc is writeen s gives me sd d gives me sd e gives me we 2 gives me 23, So when I want @ it gives me @# 3 gives me 23 Pressing CAPS Lock gives me F3 and vice-versa. All other key are either working fine or I don't use them. I have two operating system Ubuntu and Windows, I use Windows very less and found this problem on Ubuntu, but as soon as I logged in to Windows (for checking) then I found that Windows has the same problem. Effects on my life This starts form the time of login, even I have problem in typing my password. Whenever I try to save any webpage, it is bookmarked automatically. Whenever I copy, it is cut automatically. I have to spend more than half of time correcting what I have typed. Note: Typing thisd quwesdtion wasd rweally a big pain to mwe.

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• Clicking far away in vim in tmux in urxvt

  - by paps

  I use vim inside tmux inside urxvt, and the mouse works perfectly well for clicking and selecting text, except when I want to click too far to the right. It seems to be related to the distance in number of columns from the left. When I go beyond column ~200 (not sure about the exact number), clicking simply does nothing. Note that it's not related to a vim window: with two vim windows taking ~150 columns each, clicking will not work after the ~50th column in the second window. It's related to the whole vim session. Also note that clicking far away in a big tmux pane (200 columns) works perfectly. In my .tmux.conf I have this line: set -g default-terminal "screen-256color" and in my .vimrc I have this: if &term =~ "^screen" autocmd VimEnter * silent !echo -ne "\033Ptmux;\033\033]12;7\007\033\\" let &t_SI = "\<Esc>Ptmux;\<Esc>\<Esc>]12;5\x7\<Esc>\\" let &t_EI = "\<Esc>Ptmux;\<Esc>\<Esc>]12;7\x7\<Esc>\\" autocmd VimLeave * silent !echo -ne "\033Ptmux;\033\033]12;14\007\033\\" end It changes the cursor's color depending on the editing mode of vim, and it works, meaning that tmux really sets $TERM to "screen-256color" — but I don't know if this has any relevance with my mouse problem. I'm running Ubuntu 12.04, vim 7.3, tmux 1.6 and rxvt-unicode 9.14. Does anybody have an idea about what is causing this problem? Thanks.

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• Is it a good Idea to switch to a SSD to use less battery?

  - by Walter Maier-Murdnelch

  I am thinking of buying a SSD for my laptop, mainly for the purpose of extended operating time when running on battery. At the moment I use a Hitachi HTS545032B9A300 (320GB) (Datasheet) as main drive and a Seagate Momentus 5400.3 120GB as secondary drive. I dualboot Windows and Linux but I don't need the windows partition any longer, a 120GB SDD would be more than sufficient space-wise. Speed is not an issue for me, I make heavy use of tmpfs (ramdrive) within Linux and transfers of bigger files are mainly through some network filesystem anyways, thus a cheaper SSD should do. For the purpose of comparison I chose the OCZ Vertex Plus 120GB. Power consumption always is a big promotional thing the industry uses to make me want to buy their SSDs, some sheet on the OCZ page provides an astonishing comparison of desktop HDDS and SSDs. The numbers I got comparing my laptop HDD and their SSD were not really astonishing any longer. Hitachi 320GB HDD: Startup (W, peak, max.) 4.5 Seek (W, avg.) 1.7 Read / Write (W, avg.) 1.4 Performance idle (W, avg.) 1.3 Active idle (W, avg.) 0.8 Low power idle (W, avg.) 0.5 Standby (W, avg.) 0.2 Sleep 0.1 OCZ 120GB SSD: 1.5W active 0.3W standby I see that there are differences, but actually they don't seem that high as I though they were. And compared to the power consuption of the rest of my system I wonder if it makes a difference at all. Have I just taken the wrong look at the whole thing or may I be better off to buy another battery for my laptop?

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• What Windows app can sort a huge XML file?

  - by Torben Gundtofte-Bruun

  I have some enormous XML-based configuration files, with 125000 lines in them. The problem is that they are auto-generated by the system I use, and "child" tags are in a random order within their respective parent tag. This means that a diff comparison is impossible. I want to recursively sort all tags within a parent tag by the value in name="". Some parent tags only appear once and don't have a name="" parameter; these should be sorted by the tag name itself. Once the files are sorted like this, they can be compared quite easily using normal tools. We are currently using ExamXML which can match unsorted XML files, but it fails because the files are too big. Is there an application that can do this? (Windows much preferred; Linux only as a last resort) I do not want to dive into development or XSLT jobs. I am thinking that someone must have made a simple sorting tool like this already - I just can't find it using Google. Update: With help from this site, I created a small package that I want to share: XML-Sorter_v0.3.zip Update: Follow-up question here.

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• IIS 7.0 rewrite url problem

  - by Jouni Pekkola

  Hello, How i can set redirect url for virtual directory in iis 7.0.I have installed lates url rewrite module 2. ? I could explain my problem with exsample. I have website on my iis 7.0 server: www.mysite.com I desided to create virtual directory sales under my site which is pointing to website root directory.Now I need create redirect url for the vdir. The vdir is pointing same virtual root directory as my site root is The big idea is that i can write on browser www.mysite/sales and i will automaticly redirect to url www.mysite.com?productid=200. I tried to make redirect with rewite url for vdir(not website), but I always get this error message : cannot add duplicate colletion entry of type 'rule' with unique key key attribute 'name' set to "test".This happens when i am pointing for virtual vdir and try to add rule. I can add rules to website level,but rules doesn work. I mean url www.mysite/sales gives me follwing error. I know that key is unique I checked it from web.config. This kind of feature was really easy use in IIS 6.0, just point vdir with your mouse and set properties--a redirect to url. Please some one explain what is right way to do it in IIS 7.0

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• Can Windows Media Player create playlists based on folder structure?

  - by Chaulky

  Over the years I've carefully molded my digital media collection into a series of folders that make it easy for me to find what I'm looking for. I recently discovered the awesomeness that is streaming video from Windows 7 Media Player to the PS3 so I can watch it on the big screen without all the hassle of hooking the computer up to the TV. The problem is, I totally lose my carefully crafted folder structure and all my videos become one giant mess again... not cool! As a temporary solution, I've created a few playlists for my favorites (Dexter Season 4, Dexter Season 5, Breaking Bad Season 1, etc.). This is a HUGE pain in the a$$. So, is there a way to get Windows Media Player (on Windows 7) to maintain some sort of folder structure based on the location of the actual video files? So if I have my videos sorted into folders by show and season, Media Player will pick that up and let me browse it in the same way. As an alternative answer, I'll accept suggestions for a program that can also stream to PS3 and has this "folder organization" feature.

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• Is there any way to synchronize AD users with Office 365 but still be able to edit them online?

  - by Massimo

  I'm performing a migration to Office 365 from a third-party mail server (MDaemon); the local Active Directory doesn't include any Exchange server, and never had any. We will need directory synchronization in order to enable users to log on to Office 365 using their domain credentials; but it seems that as soon as you enable directory synchronization, you can't perform any action anymore on Office 365 users: all changes need to be made on the local Active Directory, and then replicated by the synchronization process. For ordinary users with a single e-mail address and standard features, this is not a big problem; but what about users which need an additional address? What if I need to configure some nonstandard setting, like "hide from address list" or a custom mailbox quota? From what I've gathered, the only supported way to do this, as you can't directly edit Office 365 objects anymore after synchronization is enabled, is to extend the local AD schema with Exchange attributes, and then manually edit them (!). Or, you can install at least one local Exchange server, and then use the Exchange administrative tools to configure the required settings. Is this correct or am I missing something? Is there any way to synchronize user accounts and password, but still be able to edit user settings directly in Office 365? If not (everything really needs to be set locally and then synchronized), is there any simpler way to do this than manually editing LDAP attributes or installing a local Exchange server?

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• FreeBSD jail IMAP/MTA config recommendations

  - by kobame

  I've got access to my "own" FreeBSD jail. The jail has only basic, unconfigured system, but I have full access to FreeBSD ports, and (jail)root too. Now I need to setup my jail as IMAP/MTA. The question: What packages are EASIEST for config and later administration, (the simplest possible setup, with the minimum needed configuration) when: i haven't any preferences (don't know any yet) my (one) domain is managed by ISP, so don't need DNS need only IMAP for few users (up to 20 mailboxes) need secure transport layer (IMAPS/993) password auth, no LDAP, no kerberos, nor databases, nothing like fancy things... need easy-setup easy-admin MTA, with simplest possible password SMTP auth, (again no LDAP, nor DB), secure transport layer but would be nice have virus-scan and some anti-spam protection So, what ports I should install for MTA and IMAP? MTA (Sendmail, Postfix, Exim)? antivirus (ClamAV) antispam??? IMAP(S), (Dovecot, Courier) when the main criteria are: easy setup, and easy administration. When I googled I found only complicated setups for thousands of users with LDAP, databases and so on - too big-caliber for my small (easy?) needs. Any pointer to an easy howto is very welcomed.

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• Troubles with apache and virtual hosts

  - by xZero

  I have a BIG problem. I have VPS with Debian OS, and LAMP installed. Fresh install. For control panel i using Webmin. Now i trying to setup multiple sub-domains on my server using webmin for example: downloads.my-domain.com cpanel.my-domains.com forum.my-domains.com But problem what is happening is next, while i using no virtual hosts, everything works perfectly when i accessing it using my-domain.com, but when i add Virtual host, i cann access it but my-domain.com becomes unavilable because it redirects to virtual hosts i added. When i add more than 2 virtual hosts, problem is still here. Also, when i try to access to virtual server for example downloads.my-domain.com, it redirects again to cpanel.my-domains.com When i delete virtual hosts, access to my-domain.com is succesfull... What i known: - That is not problem with my domain provider. I correctly added subdomains and added host record to my VPS IP. - I added unique name to every single virtual host. - There are no two same virtual hosts - Every virtaul hosts have own directory: for example: downloads.my-domain.com have own WWW dir: /var/downloads Can somebody help me? Thanks.

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• Terminal is not letting me make commands unless I hit enter a bunch of times

  - by ninja08

  Whenever I open terminal it normally allows me to immediately begin making commands. Only earlier today I did the setup for github here https://help.github.com/articles/set-up-git And then all of a sudden the thing where I give terminal commands won't allow me to give it commands unless I hit enter a few times. This is what it looks like: Last login: Fri Nov 9 11:43:28 on ttys001 mysql.save: Permission denied mysql.save: Permission denied /Users/Nick/.zshrc:32: command not found:  . ~ git: ? ~ git: ? ~ git: ? See the big space? That's because it simply will never show the ~ git: thing unless I hit enter 3-4 times. Also, it never used to say ~ git: before I did the git setup. I'm not sure what I changed. I've checked the zshrc file and commented everything out to find the line causing the problem. I've done that and it turns out it was the source $ZSH/oh-my-zsh.sh Within the oh-my-zsh.sh file I've commented out each block of code for the file starting at the top and I've found that this block is causing it: # Load the theme if [ "$ZSH_THEME" = "random" ] then themes=($ZSH/themes/*zsh-theme) N=${#themes[@]} ((N=(RANDOM%N)+1)) RANDOM_THEME=${themes[$N]} source "$RANDOM_THEME" echo "[oh-my-zsh] Random theme '$RANDOM_THEME' loaded..." else if [ ! "$ZSH_THEME" = "" ] then if [ -f "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme" ] then source "$ZSH_CUSTOM/$ZSH_THEME.zsh-theme" else source "$ZSH/themes/$ZSH_THEME.zsh-theme" fi fi fi

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• MySQL fault linked to windows shutdown failure?

  - by Roy

  As far as i understand my computer is experiencing a strange coincidence (hopefully it isn't and somebody can enlighten me). Basically i shut down my laptop (Windows 7) (at 17.20, today, to be precise) successfully (and so also did XAMPP and its included components). However upon starting my laptop up again in the last hour i noticed that the MySQL module service in my xampp control panel was not coming on (just a big red tick; incidentally everything else was working fine). Now, i had the exact same problem about two weeks ago, whereby i just reinstalled xampp and got it working again. But rather than doing this straight away i thought i would just restart my laptop first. However it won't restart (or shut down first) to be precise now. I can remember Windows wasn't shutting down properly the last time it happened (about two weeks ago). Just wondered if this coincidence pointed to any specific diagnostic as regards the problem with MYSQL? If so i would appreciate greatly any help. Otherwise sorry for wasting your time.

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• HP/Lenovo alternative to Buffalo iSCSI TerraStation?

  - by Robin Day

  I'm looking at virtualising some of our infrastructure in order to allow for more resiliance and future expandability. We have successfully virtualised on single servers with Direct Attached Storage and are now looking for a more future proof solution using a high powered host (or two) and a SAN (or two). I'm thinking that the host machine will probably be an HP ProLiant DL360 G7 (all of our exisiting infrastructure is HP). Unfortunately, I am new to the world of SANs. From what I can see, the Buffalo Terrastation III is all I would need in order to setup an iSCSI SAN for VMWare to use. However, I'm a little reticent to go that way as it's a bit too "entry level" for my liking. In particular I would be very keen for more redundancy, power, networking, etc. I'm also very aware that you "get what you pay for". Therefore, can anyone reccommend equivalents from the big boys? HP/Lenovo? I have searched high and low on the HP site and seen many options but am struggling to work out if it is all the hardware I will need. Some options appear to need separate controllers from disk enclosures, etc.

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• Internet connection problem,ping ok , but outlook and browsers dont work

  - by Ashian

  Hi, From some days ago I have a big problem on my laptop( run windows xp sp3) When I connect to internet I can ping web sites but when try to browse them some times it work correctly and some times the connection to server intrupted and I have to refresh the page several times. in this case browser show a connection problem immediatly after I click on address bar or a link on page( wihtout any try to connect to server) I use FireFox and opera and both of them have this problem. try another ISP and still I have this problem. I didnt use any proxy server and check the proxy setting. In this case Outlook also can't connect to mail server. this problem anfter some time or after restart windows have been fixed for a while. I check for virus and can't find anything. Is there any idea how can I fix it? UPDATE: Thanks for your responses. I test them , also I use Open DNS setting and that dosent help me. last night I see that my local web application ( such as Adsl modem config web site , and sites that I set up on windows xo IIS ) aslo can't open and Internal Communication error apears ( Opera Message) that didnt relate to DNS settings or Internet connection.

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• Windows mounted network drives slow after upgrading switch

  - by Kver

  On our small business network our old 10/100 consumer grade switch gave up the ghost, and we replaced it with a proper business-grade gigabyte switch. After wiring it in our Linux and Mac users immediately got back to working off of network drives; But 2 of our 3 Windows 7 PCs have suddenly experienced a tremendous slowdown with mapped network drives; Windows will become stuck "discovering" a folder causing applications to freeze when trying to open files. It will instantly display and browse files, but the moment you try to open one the bug hits. To remedy this we have our users copying files to the desktop, but it can take a few minutes while windows is stuck "calculating" the time it will take to copy. These aren't big files, mostly excel sheets less than 500KB - these operations are instant on Linux and Mac. (The third Windows machine is having no issues) I've tried remapping the drives, mapping to different drive letters, rebooting, etc. I'm at a loss, because switches are mostly transparent, and it's only after the switch was replaced that the Windows PCs started acting up. What black-magic voodoo am I missing to make Windows work? Thank you.

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• Managing SharePoint permissions via Active Directory?

  - by rgmatthes

  My company has thousands of employees organized thoroughly via Active Directory. I have confidence in the accuracy of the Department and Title information displayed in the user profiles. I'm helping to put up a brand new SharePoint 2007 site, and I contacted IT about managing the site's permissions through AD Groups. The goal is to have the site automatically assign read/write/contribute/whatever permissions based on the information in AD. For example, we could create an AD Group called "Managers" that would contain anyone with the "Manager" title in their AD user profile. I would have SharePoint tap into this AD Group to mass assign permissions if I knew all managers would need a certain level of access (read/write/contribute/whatever). Then if a manager joins the company or leaves it, the group is automatically updated (provided AD gets updated, of course). My IT rep called back and said it couldn't be done. This seems like a pretty straightforward business requirement, and one of the huge benefits of having Active Directory, but maybe I'm mistaken. Could anyone shed some light on this? A) Is it possible to use dynamically-updated AD Groups when assigning permissions via SharePoint? (Does anyone know of a guide I could show my doubtful IT rep?) B) Is there a "best practice" way to go about this? I've read some debate on whether SharePoint Groups or AD Groups are the way to go. My main concern is dynamic updating. C) If this isn't available out of the box, can someone recommend third-party software that will provide the functionality I'm looking for? A big thanks to anyone who can help me out!!

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• Proxmox: VMs and different public IPs

  - by Raj

  I have a server which has two NICs and both are directly connected to internet. I have five different public IP addresses available for the VMs. The host machine (Proxmox) doesn't need to use any (it'll use a private IP and that's all) but will have internet connection. I've gone through the Proxmox documentation and I'm not able to understand the big picture to set up the right network configuration for my needs. In short, what I have is: One server (Proxmox, host machine) On that server, 5 VMs are created 5 public IP addresses available (one for each VM), let's say: 80.123.21.1, 80.123.21.2, 80.123.21.3, 80.123.21.4, 80.123.21.5 What I have now for the host is the following: auto lo iface lo inet loopback auto eth0 iface eth0 inet manual auto eth1 iface eth1 inet manual auto vmbr0 iface vmbr0 inet static address 192.168.1.101 netmask 255.255.255.0 bridge_ports eth0 bridge_stp off bridge_fd 0 auto vmbr1 iface vmbr1 inet manual It can be reached from the internal network, so that's OK. It has internet connection, which is also OK. vmbr1 is going to be used by the VMs. Each VM will have its own IP on his network interfaces configuration file. For some reason, VMs will not have internet and they won't be able to have public IP address. If I use NAT, it will work correctly, but they will not use the public allocated IP addresses for them. Am I missing something?

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• SQL Server 2005 to 2008 DB attach elp please!

  - by Brandon

  I have SQL Server 2005 Standard on my personal machine. I created a very big DB about 21 gb. I made a backup and transferred the .bak file via an ftp program to my dedicated server. I have SQL Server 2008 Enterprise Edition on my dedicated server. I tried restore the transferred .bak file but got an error. I posted the error on here and was told the database is corrupt. How? I don't know. The connection was not interrupted during the ftp transfer. The DB works on my own machine. So then I detached the db on my own machine and transferred the mdf and ldf file to my dedicated server through ftp again and again there were not interruptions. Now I try to attach the db and get this error: The header for file 'DB.mdf' is not a valid database file header. The FILE SIZE property is incorrect. (Microsoft SQL Server, Error: 5172) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=10.00.1442&EvtSrc=MSSQLServer&EvtID=5172&LinkId=20476 I already wasted 21 gb transferring the .bak file. Now I used another 21 to transfer mdf and additional ldf file. Please tell me there's a solution. The db can detach and attach fine on my machine in sql server 2005 but not SQL server 2008 on my server.

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