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• How do the routers communicate with each other ?

  - by Berkay

  Let's say that i want make a request a to a web page which is hosted in Europe (i live in USA).My packets only consist the IP address of the web page, first the domain name to ip address transformation is done, then my packets start their journey through to europe. i assume that MAC addresses never used in this situation? are they? First, my packets deal with many routers on way how these routers communicate with each other?, are router addresses added to my packet headers ? Second, is there a specific path router to router comminication or which conditions affect this route? Third to cross the Atlantic Ocean, are cables used or... ?

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• Disable Acer eRecovery system

  - by Joel Coehoorn

  The meat of this question is that I'm looking for a way to either require a password before using a recovery partition or "break" the recovery partition (specifically, Acer eRecovery) in a way that I can later "unbreak" only by booting normally into windows first. Here's the full details: I have a set of new Acer Veriton n260g machines in a computer lab. A lot work went into setting up this lab to work well - for example, Office 2007 and other programs needed by the students were installed, all windows updates are applied, and a default desktop is setup. All in all it's several hours work to fully set up one machine. Unfortunately, I don't currently have the ability to easily image these machines, and even if I did I would want to avoid downtime even while an image is restored. Therefore, I've taken steps to lock them down — namely DeepFreeze and a bios password to prevent booting from anywhere but the frozen hard drive. DeepFreeze is an amazing product — as long as you boot from the frozen hard drive, there is no way to actually make permanent changes to that hard drive. Anything you do is wiped after the machine restarts. It lets me give students the leeway to do what they want on lab computers without worrying about them breaking something. The problem is that even with the bios locked and set to only boot from the hard drive, these Acers still have a simple way to choose a different boot source: shut them down and put a paper click in a little hole at the top while you turn it on again. This puts them into the "Acer eRecovery" mode. This by itself is no big deal — you can still power cycle with no impact. But if you then click through the menu to reset the machine (we're now past the point of curiosity and on to intent) it will wipe the hard drive and restore it to the original state. Of course, a few students have already figured this out and reset a couple machines. That's unfortunate, but inevitable. I don't want to destroy the ability to do this entirely (which I could by repartitioning the drives to remove the recovery partition) but I would like a way to require a password first, or "break" the recovery system in a way that I can "unbreak" only if I first un-freeze the hard drive in DeepFreeze. Any ideas?

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• Openfiler RAID 10 option not found

  - by chrisling106

  Hi, I'm building a NAS using Openfiler2.3 (from 32-bit ISO), first of all I want to experiment it on VM first before going out and buy the harddrives needed. I created 5 virtual drives on VMware, sda is 2GB and the rest 1GB each (sdb to sde). I left sda blank and want to setup a RAID 10 disk using sdb, sdc, sdd and sde, 4 RAID partitions are setup successfully, but when I try to create a RAID device the only option for RAID level is 1, 0, 5 and 6. RAID 10 is not there! Can someone let me know what have I missed, please? TIA.

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• Change the order of DNS lookup when connected in the VPN

  - by qwerty2010

  Hi, Using Windows 7 Pro here. I have my LAN network adapter with DNS server 8.8.8.8 (Google's DNS). I also have OpenVPN client to connect to my company's network. If I type "nslookup" while disconnected from the VPN, I get 8.8.8.8 (from my LAN network adapter). If I type "nslookup" while connected in the VPN, I get the DNS IP from my company's network. That makes me think that when connected to the VPN all DNS's resolution are routed first to my company's DNS. How can I change this order, and make the DNS resolution be routed to 8.8.8.8 first, when I'm connected to the VPN? Thank you

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• Macro to manage sport ranking and calendar?

  - by Ale

  I need to write a macro to manage ranking and calendar for curling turnament. The event will follow the Shenkel system first match determined by general draw after that every team has played one match is possible to determine the first ranking second match determined by the rule: 1st vs. 2nd - 3rd vs. 4th - 5th vs. 6th and so on after that every team has played two matches is possible to determine the second ranking and so on until the end (3 to 5 matches normally). Another rule is that from the second match is not possible to play against a team that I played before! I was thinking to use MS-excel but also Calc (both LibreOffice/OpenOffice) should be fine. Thanks in advanced

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• Automating Nightly Build Installation?

  - by StickFigs

  Every night a new build of my program is made and copied to a /Builds/ folder. I have a Windows machine that I want to have uninstall the program then install the latest version of the program from the /Builds/ folder. Currently the build results in two separate setup.exe files which are InstallShield installation wizard executables. I want this to happen every night after the build finishes: Uninstall first component. Uninstall second component. Install newest build of first component using setup.exe. Install newest build of second component using setup.exe. I figured that there probably already exists a software solution for automating installations like this. Are there any software solutions out there than can do what I need? Preferrably for free?

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• tcp flags in iptables: What's the difference between RST SYN and RST and SYN RST ? When to use ALL?

  - by Kris

  I'm working on a firewall for a virtual dedicated server and one of the things I'm looking into is port scanners. TCP flags are used for protection. I have 2 questions. The rule: -p tcp --tcp-flags SYN,ACK,FIN,RST SYN -j DROP First argument says check packets with flag SYN Second argument says make sure the flags ACK,FIN,RST SYN are set And when that's the case (there's a match), drop the tcp packet First question: I understand the meaning of RST and RST/ACK but in the second argument RST SYN is being used. What's the difference between RST SYN and RST and SYN RST ? Is there a "SYN RST" flag in a 3 way handshake ? Second question is about the difference between -p tcp --tcp-flags SYN,ACK,FIN,RST SYN -j DROP and -p tcp --tcp-flags ALL SYN,ACK,FIN,RST SYN -j DROP When should ALL be used ? When I use ALL, does that mean if the tcp packet with the syn flag doesn't have the ACK "and" the FIN "and" the RST SYN flags set, there will be no match ?

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• Problems with Xen installation

  - by Rodnower

  Hello, I have CentOS 5.4 installed. Now I'm trying to install Xen with out connecting to Internet (I have any driver for modem, so I search on Inernet only from Windows). All I have are 7 installation disks. First I done was to find kind of some add/remove programs wizard but it needed connection to Inernet. Second I try was to find Xen rpm on all disks and install it. But I fell on some dependency of some dependency. Third I attempted was to boot from first disk and do upgrade, but also it was unsuccessfully... So my question is: is there some way to install Xen from CentOS installation disks with out network? Thank you for ahead.

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• Bash Script to Compress / Transfer / Remove Log Files

  - by Jason

  I am currently using chronolog to set log file names for Apache with date. They are in the following format: /WEB/LOGS/APACHE_ACCESS_YYYY-MM-DD.log /WEB/LOGS/APACHE_ERROR_YYYY-MM-DD.log I would like to have a script that runs on the first of every month and compresses the log files from the previous month, transfers them to another host (via SCP) and then deletes the compressed file. find . -name '*.log' -mtime +1 -type f I've found several examples like the one above that allow you to select files x days old, but I need all files from the previous month. I am the first to admit my bash scripting skills are weak so would really appreciate any help and guidance.

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• How to set the PHP Api Version for phpize

  - by Tom Frost

  I'm upgrading php on my server but I'm running into a problem with phpize and compiling external modules. phpize -v reports: Configuring for: PHP Api Version: 20041225 Zend Module Api No: 20090115 Zend Extension Api No: 220090115 But on my test server (which I'm trying to replicate) I get this: Configuring for: PHP Api Version: 20090626 Zend Module Api No: 20090626 Zend Extension Api No: 220090626 I'm running debian squeeze, pulling the php 5.3.0-2 packages from the experimental repo. The difference betweent he two servers is that the first server has had old verisons of php on it, and the test server was installed with php 5.3.0-2 from the start. I've attempted uninstalling all PHP packages from the first server (using --purge to get rid of all the config files) and re-installing 5.3 fresh, but I'm still having the same issue. Help!

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• How to stop Windows 7 from automatically connecting to unsecure wifi network

  - by Remi Despres-Smyth

  One of my neighbors has an unsecure wifi network called WLAN. At one point in the past, I accidentally connected to it, and disconnected immediately when I noticed. Now, when I open my laptop at home, it sometimes connects to the WLAN network first, before trying my (secured) home wifi network. The information I've found regarding this issue seems to suggest this network should have a profile on the "Manage wireless networks" screen - but it does not. How do I tell Windows 7 to never connect to networks with SSIDs called WLAN? Or to never connect to unsecured networks without confirming with me first?

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• Weird noise while scanning, using scanimage and a Canon Lide 35

  - by Manu

  I'm trying to scan a bunch of images, using xsane's scanimage : scanimage --format=tiff --batch --batch-prompt This command scans the first picture perfectly, but as soon as I press enter, the scanner makes a weird noise, and the scanning "arm" moves very, very slowly. If I stop scanimage and start again, it scans normally again. Is there another scanimage option that I need to add? I've checked the man page, but can't see what I'm missing. Edit: the problem seems to be that the scanning "arm" doesn't go back to it's original position after the first scan.

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• Windows 8.1 upgrade created a second recovery partition. Can I remove the original?

  - by Dave S

  Windows 8.1 upgrade created a second recovery partition. Can I remove the original? Prior to this the partitions were Recovery, EFI, OS(C:), Data(D:). After the upgrade partitions are Recovery, EFI, OS(C:), Recovery, Data(D:). The first Recovery partition is 1023MB the second is 350MB The "Create a system image" tool selects the EFI, OS(C:), and the second 350MB Recovery partitions. The first 1023MB Recovery partition is not listed, I have to "assume" it is now redundant. The factory (HP) Recovery Partition was removed using the HP provided tool after creating recovery disks, and the D: partition created months ago.

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• Dell PR03X port replicator and DisplayPort to DVI adapter not detecting second monitor

  - by yothenberg

  Hi, I have a dell M4400 connected to a PR03X port replicator/docking station. I use the DVI port to connect it to a first Dell 2208WFP monitor and I'm trying to use a DisplayPort-to-DVI adapter to connect it to a second Dell 2208WFP monitor. The second monitor, connected via the DisplayPort-to-DVI adapter immediately goes into sleep mode and the laptop doesn't detect it. What is really weird is that it did detect it the first time I plugged it in but after I unplugged the monitor and plugged it back in it stopped working. I swapped the monitors round and it detected them both but after unplugging the monitor connected via the DisplayPort-to-DVI and plugging it in again it stopped working. Both monitors work if plugged in directly to the DVI port. Is there some way to force re-detection? Any ideas? Thanks, Mark

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• Sonicwall NAT Policy Loopback

  - by John

  I have an issue and am pretty perplexed over it. I have a sonicwall and its setup with NAT polices and reflexive nat for an internal web server. That is, only 2 policies, no loopback policy, and the internal clients can access the web server by public ip no problems. Now, on another connection, another sonicwall, i have the exact same setup for another web server, with exact same policies (obviously different IP's) and the internal clients can't access the internal website by its public IP without creating the loopback policy. Maybe on the first one I've overlooked it, but I don't see any loopback what so ever and its working fine. My question is, does anyone know why the first one works like this but the second one needs the loopback policy? Thanks

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• OpenOffice Writer page style bug?

  - by ttt

  I have a large Open Office odt document. It uses (mostly) four page styles: Left Page, Right Page, Left Chapter, and Right Chapter. The last two are custom styles that simply remove the header. But I have a problem with Chapter 4: if I try to set the style of the first page to Right Chapter, it sets the style of Chapter 3's first page! I've tried it several times, and it always does this. Am I doing something wrong, or is this a bug? Or is my file corrupted?

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• Stable MSN messenger for mac?

  - by Console

  I use Adium in my mac as a client for MSN messenger. (I have also tried the "official" live messenger for mac for a while but it had even worse issues than what I am experiencing with Adium). Everything works fine for the first 5-10 minutes, perhaps until the first automatic "away", then suddenly any message I send is followed by a dozen or so messages saying: "Message could not be sent because a connection error occurred:" and Message may have not been sent because a timeout occurred: If I send a few messages, they usually eventually arrive (all at once) after a long delay. Windows machines on the same network running live messenger work fine. Any ideas why this might be, or suggestions for a client that might work when both Adium and Microsofts own messenger for mac seem to disconnect?

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• Apple Automator "New PDF from Images" maintaining same filename

  - by mech

  I will potentially have 26k of old legacy PICT images to transfer first to PDF for migration. I am using Apple Automator and also the "Dispense Items Incrementally" to loop through it. However, I can't seem to let "New PDF from Images" to remember the original filename. Anyone able to offer some advice :) FYI, I am transforming it to PDF because I can't do it using ImageMagick to convert directly to my ultimate JPEG format. Due to the fact that my PICT was created very long ago and thus has some convert: improper image header error. See this ticket for more information. Thus I am doing a intermediate convert PICT to PDF first, then convert that PDF to JPEG :) The only thing left is the naming of the "Output File Name" which do not allow me to identify original filename. See the screen here:

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• Vlookup to retrieve an ID from table using text match

  - by Federico Giust

  I've got an excel spreadsheet where I would normally use a VLOOKUP. In this case I need to find the ID of the record when comparing email addresses, so the email address is the unique id here. For example on sheet 1 A B C D Person Id | Family Name | First Name | Email #N/A | Doe | John | [email protected] On Sheet 2 A B C D Person Id | Family Name | First Name | Email 12345 | Doe | John | [email protected] Basically on sheet 1 I've got 800 records, on sheet 2 450. I know the 450 are in Sheet 1, so I need to find the ids of those, and put them on sheet 1 where I've got lots more data for each person. What I've tried so far is a VLOOKUP, but I keep getting an error. I'd like to do it with some sort of formula and not using any copy paste and remove duplicates. Any ideas?

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• How do I install Windows7 on a diskonkey (ON, not FROM)?

  - by Erez

  Please be the first site to have an answer, I'm desperate.

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• Keeping my zsh or bash profile synced up on all my machines.

  - by Joseph Silvashy

  I work on several different machines, all of which are *nix. I have a lot of specific things I like my shell to, or the prompt to look like, or aliases, etc, etc. I'm sure all of you folks deal with this as well. What do you think the best way to keep all my machines' shells to act the same? First off, I'm aware that different machines will need different paths to bins and other differences, so my first inclination is to just include a file at the end of my profile, this is the one that we'll keep in sync. What is the best way to keep files synced up? I can put the file on a remote system, and perhaps use git, to push, then pull my changes every once and a while. However, isn't Rsync better suited for this?

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• UAC prompt won't allow non-administrator to access IIS 7 Manager.

  - by Triynko

  The IIS 7 Manager seems to throw up a UAC prompt requiring administrative elevation as soon as the shortcut is clicked. This makes it impossible for a non-admin to use it. When I first created the user account, I could open IIS 7 Manager, but could not connect. I temporarily made the user account an Admin, then opened IIS 7 Manager again. Now that I've removed user from Admin, every time I open IIS 7 Manager it throws up the UAC prompt, making it impossible to do anything with it as a non-Admin. Is this a bug? Is there a way to reset the settings for this user so that IIS 7 Manager is back in some kind of first-run state?

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• change owner/uid of mount point upon mount

  - by Shiplu

  The scenario is like this. Bob has a computer. It crashed. Now he only has the hdd. The hdd is in ext3 format. He go to his office and told the sys admin John to mount this hdd and put the mount point in his home directory. John used the following fstab entries. # Bobs harddisk /media/TAPE4/Bobs-hdd.img /home/bob/myhdd/windows ntfs ro,loop,offset=32256 0 0 /media/TAPE4/Bobs-hdd.img /home/bob/myhdd/linux ext3 ro,loop,offset=14048810496 0 0 /media/TAPE4/Bobs-hdd.img /home/bob/myhdd/extra ntfs ro,loop,offset=28015335936 0 0 Bob was happy. He could access his old extra and windows. Specially the Documents and Settings in windows was helpful for him. But he found a problem. He is a web developer and all his websites are in linux/home/bob/public_html directory. When he tried to access that public_html directory he got permission_denied. He executed ls -lh he saw this. drwxr-xr-x 2 john john 4.0K Nov 9 2011 Desktop drwxr-xr-x 3 john john 4.0K Aug 12 2011 Documents drwxr-xr-x 3 john john 4.0K Aug 21 2011 public_html He contacted John thinking he might be mistakenly did this. But John couldn't find a way why this happend? Then one thing came into his mind file system hardly store username. They store uids. So he executed ls -ln drwxr-xr-x 2 1000 1000 4096 Nov 9 2011 Desktop drwxr-xr-x 3 1000 1000 4096 Aug 12 2011 Documents drwxr-xr-x 3 1000 1000 4096 Aug 21 2011 public_html John thinks 1000 is the first uid on a linux system. As he is the admin of the current system. He created his account first. so Johns uid was 1000. Bob also setup his private system and crated his account first. So Bobs uid was 1000 too. So thats an expected behavior. But problem remains. How can Bob access those websites in public_html?

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• Texture and Pattern Generator

  - by Ara

  I use Adobe Fireworks for its Texture and Pattern tools to make things like this: http://i.imgur.com/sci7Roc.png and then i copy-paste it to Flash Professional (Adobe) to use there. but fireworks is so slow and buggy is there a free or commercial software to do this simple Texture / Pattern thing easily? Texture (like the second image above) Patter and Texture (like the first one) Transparent Texture, so the background color would be visible instead of the white lines in second image The ability to copy and paste it (as PNG 32 or any alpha transparent image) so i don't have to save it first and then import it to flash * I Use Mac OS X 10.8.4 *

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• how to run cron job every 3 months in apache2 ?

  - by haim evgi

  how to create a cron job that run in first day of the month , every 3 months thanks

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