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• faking NAT with a VMware distributed switch across multiple hosts

  - by romant

  I need to construct a NAT for certain machines within the network. Wish to do this with dvSwitch - as it seems the logical way of attacking the problem as in this scenario there's just under 30 hosts. In order for the NAT'ed VM's to have access to the 'real' network. I am providing a 'router' VM, which will have access to the WAN/outside network, and also act as the DHCP server for the NAT'ed machines. Problem Space When the machines connected to the NAT interface and the router are on the same host, then they get an IP from the router VM, and work perfectly (routed outside). Unfortunately machines on other Hosts that are connected to the dvSwitch do not get an IP and further tcpdump shows no network data getting through across the hosts within the dvSwitch. Has anyone achieved a NAT solution using a dvSwitch before that they could share?! Thank you. EDIT: Including the diagram.

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• Cascading switches: uplink to uplink?

  - by wuckachucka

  I'm a bit confused as to why I haven't seen any references online to using Switch A's uplink port (1Gbps, 24-port 10/100) to connect to Switch B's uplink port: everything I've seen -- including documentation, forums, articles, etc. -- has Switch A's uplink port going to one of Switch B's 10/100 access ports. As I understand it, the Uplink port (besides greater speed normally) is no different than another port except that it's "internally crossed-over" so that you can use a straight cable with it. I've also seen documentation on using the uplink port to connect a switch to a gateway router, or even a server, as it provides greater bandwidth than the access ports, but yet not sure why nobody seems to be cross-uplinking, even when there's 2 uplink ports available on some higher-end switches. Switch in question is Linksys SRW224P (x2). Am I missing something?

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• Encrypt remote linux server

  - by Margaret Thorpe

  One of my customers has requested that their web server is encrypted to prevent offline attacks to highly sensitive data contained in a mysql database and also /var/log. I have full root access to the dedicated server at a popular host. I am considering 3 options - FDE - This would be ideal, but with only remote access (no console) I imagine this would be very complex. Xen - installing XEN and moving their server within a XEN virtual machine and encrypting the VM - which seems easier to do remotely. Parition - encrypt the non-static partitions where the sensitive data resides e.g. /var /home etc. What would be the simplist approach that satisfies the requirements?

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• What are some good methods to improve personal password management?

  - by danilo

  I want to improve my personal password management. I usually use secure passwords, but overuse them for too many different places. My questions: What methods do you use to create passwords, e.g. for different online sites/logins? What methods do you use to remember those passwords? Memory? Pen&Paper? Software storage? Is there some good way to store my passwords somewhere, so I can always have access to them when I need them (e.g. a webbased solution on my own server) but at the same way keep them away from unwanted access? Edit: Someone on another site mentioned http://passwordmaker.org/. Have you had any good or bad experiences with that software?

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• Web service not accessible from behind corporates firewalls - how come?

  - by Niro

  We run a Saas serving a widget which is embedded in customer websites. The service include static javascript code hosted on amazon S3 and dynamic part hosted on EC2 with Scalr (using scalr name servers). We received some feedback from users behind corporate firewalls that they cant access our service (while they can access the sites including the widget). This does not make sense to me since the service is using normal http calls on port 80 and our URL is quite new without any reason to be banned by firewalls. My questions are: 1. Why is the service is not accessible and what can I do about it? 2. Is it possible that one of the following is blocked by corporate firewalls: Amazon s3, the dynamic IP address provided by amazon, Scalr name servers. Any other possible reasons, way to check them and remedies for this? Thanks!

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• TeamViewer: How to disable color dithering for low-bit-depth screen settings

  - by gogowitsch

  I am using Terminal Services and TeamViewer a lot to access other computers, partly over slow networks. The problem described below is not affected by which of the two remote access services I am using. When accessing Windows 7 Professional machines, a great deal of text is hard to read as the background is dithered. Even for exactly the same colors, Windows 2003 does not seem to dither at all, but to choose the closest available color. I strongly prefer the latter, as I don't care for the exact colors, I just want to be able to read easily. I am not sure whether this is operating system-related. The programs on the remote systems do not allow me to change the color choices for the various backgrounds to anything sane. Is there a way to disable this color dithering using some target operating system setting that will do the trick for both Terminal Services and TeamViewer?

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• Process of carrying out a BER Test

  - by data

  I am subscribed to an ISP supplying a 3meg ADSL line. Lately (for the last 4 weeks) speeds have dropped from the usual average downstream speed of ~250kbps to just 0.14Mbps (according to speedtest.net) and employees are complaining about lack of access to the server. I have been calling customer support and logging calls for the last 3 weeks, but they have been unable to determine the source of the problem other than carrying out a few bitstream tests and checking the DHCP renewal times. I am going to call back and suggest carrying out a BER test. What type of equipment is needed to carry out this test? I have access to a wide range of Cisco networking equipment. Other: We don't need a leased line as there are less than ten employees.

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• How to Confirm working of Nginx Caching Proxy

  - by Mark

  I am having nginx on port 80 and apache on port 8080 on same server. I have configured nginx such that it act as reverse proxy(i am not sure whether its working or not) using this tutorial http://tumblr.intranation.com/post/766288369/using-nginx-reverse-proxy. steps i followed to verify proxy. opened same page on two different machines within an interval of 5 seconds. but in the apache access.log every request is showing 200 response code.Does that indicate that caching is not working? and nginx access.log is showing nothing.

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• Symantec NetBackup restore - Incremental backup

  - by w0051977

  We are using Net Backup as a corporate solution. Incremental backups are taken daily during the week and then a weekly backup is done at the weekend (Saturday). My colleague has restored a folder to how it stood at 14:00 on a Tuesday. The problem is that the restore is taking files from the weekend backup if they did not exist at that point in time of the restore. For example, the folder we are restoring should look like this (this is how it looked on Tuesday at 14:00): Folder1 (folder name) Test.txt Test1.txt Test2.txt The folder looked like this at the weekend when the full restore was done (even though it did exist at the weekend when the full backup ran): Folder1 (folder name) Test.txt Test1.txt Test2.txt Test3.txt The actual folder restored looks like this: Folder1 (folder name) Test.txt Test1.txt Test2.txt Test3.txt Test3.txt should not be restored because it did not exist at the point of the restore. Is there a setting somewhere that we are missing. The folder in question is 200GB - the example above is for simplification. I realise this is a basic question.

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• Port forwarding not working?

  - by rphello101

  I'm trying to set up an Apache Server to be accessed publicly. I'm using a Netgear R4500 router hooked up to a Motorola SB6121 modem. I can access my server on my computer by typing in my IP address. After following the instructions to forward port 80 so I can access the server from other computers, it does not work (see image). I get "This webpage is not available". I am forwarding to the IP address of my computer. Using this Network Port Scanner Tool, it says "80/tcp filtered http", which, as I understand it, means forwarding did not work correctly. In my Apache httpd file, I have: ServerName 192.168.1.13:80 and Listen 192.168.1.13:80 Anyone know what's wrong or have something I can try? click to enlarge

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• Outlook 2010 Error

  - by Trevor Sullivan

  I'm running Outlook 2010 SP1 on Windows 7 x64 SP1, and I'm getting an error message saying "Your Microsoft Exchange administrator has blocked the version of Outlook that you are using. Contact your administrator for assistance." I'm still able to log into my account using Outlook Web Access (OWA), so I know that my account is working just fine. Outlook 2010 with Service Pack 1 is the standard for Windows 7 client systems at this organization, and other people are able to access their e-mail just fine. When my account was initially configured, I was able to use Outlook for a couple of days, and then it suddenly stopped working, providing only the above error message. Do you have any ideas on what I should look into to resolve this problem? Is there any information I can obtain on the client side that will help the Exchange folks investigate the issue further? Is there any verbose logging I can enable, or diagnostic logging in Outlook? Cheers

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• Is it possible to use the IE10 App without making Internet Explorer the default browser?

  - by nhinkle

  Windows 8 comes with two versions of Internet Explorer: the normal desktop version, which looks just like IE9, and the Modern UI version, which is a full-screen tablet-style app. By default, links opened in desktop mode open in desktop IE, and links opened in Modern UI apps open in the full-screen app. When you set a new default browser (like Google Chrome, which has a Modern UI mode now), you can no longer access IE10 in the Modern UI at all - the tile disappears from the start screen, and there's no way to manually invoke it. I don't use IE10 much, but I'd like to have access to it in Metro mode, because it's handy for testing things out. I don't want to have IE be my default browser though. Is there any way to get the IE10 "App" to show up without setting IE to be the default browser everywhere?

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• Convert VM running on Linux hypervisor to OVF/VMDK

  - by blade

  Hi, I have a bunch of VMs on a Linux hypervisor (cloudsigma.com to be precised). I want to convert these to deploy to an ESX hypervisor (opsource cloud server), but need to create an ovf with the vmdk. I don't have access to the hypervisor of either service but opsource allow me to import ovf/vmdk so this is possible. What tool can create an ovf (With vmdk) of a Windows OS? I am not sure if VCenter Converter would work as it requires access to the hypervisor, if I remember correctly. I am hoping for something like vhd2disk which will create a .vhd of the currently running, parent Windows OS on a system. Thanks

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• Application (was Firefox) crash on first load on Ubuntu Linux on older Dell Laptop

  - by Ira Baxter

  I've had a Dell Latitude laptop since about 2000 without managing to destroy it. A month ago the Windows 2000 system on it did something stupid to its file system and Windows was completely lost. No point in reinstalling Windows 2000, so I installed an Ubuntu Linux on the laptop. Everything seems normal (installed, rebooted, I can log in, run GnuChess, poke about). ... but ... when I attempt to launch Firefox from the top bar menu icon, I get a bunch of disk activity, the whirling cursor icon goes round a bit and then (WAS: everything stops: icon, mouse. Literally nothing happens for 5 minutes. Ubuntu is dead, as far as I can tell. EDIT : on further investigation, spinning icon, mouse operated by touchpad freeze. There's apparantly a little disk activity occuring about every 5 seconds. I wait 5-10 minutes, behavior doesn't change) A reboot, and I can repeat this reliably. So on the face of it, everything works but Firefox. That seems really strange. The only odd thing about this system when Firefox is booting is that while it has an Ethernet port (that worked fine under Windows), it isn't actually plugged into an Ethernet. As this is the first Firefox boot since the Ubuntu install, maybe Firefox mishandles Internet access? Why would that crash Ubuntu? (I need to go try the obvious experiment of plugging it in). EDIT: I tried to run the Disk manager tool, not that I cared what it was, just a menu-available application. It started up like Firefox, I get a little tag in the lower left saying Disk P*** something had started, and then the same behavior as Firefox. At this point, I don't think its the Ethernet. Is it possible that the Ubuntu disk driver can't handle the disk controller in this older laptop? The install seemed to go fine.

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• SQL 2008 publisher -> SQL 2000 subscriber: Is a pull subscription possible for merge replication?

  - by Brian Dunzweiler

  I am trying to synchronize a SQL 2000 SP4 subscriber to a SQL 2008 publisher via a merge pull subscription. When the subscriber tries to run the merge agent, it fails the following error: The process could not connect to Distributor 'OH05DBS002\SAM_SSG_2008'. SQL Server does not exist or access denied. Has anyone had success with this setup? I was able to create and synchronize a push subscription so I know that communication works between the two, at least from 2008-2000. The lack of communication from 2000-2008 also affects the ability to create a linked server on the SQL 2000 subscriber. One other tidbit - I did install the SQL 2008 native client on the the 2000 box but it didn't help either. Before anyone asks, I can't upgrade the subscriber as it still needs to support replication between MS Access 2003. Yeah, I know. :) TIA, Brian

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• Web service not accessible from behind corporates firewalls - how come?

  - by Niro

  We run a Saas serving a widget which is embedded in customer websites. The service include static javascript code hosted on amazon S3 and dynamic part hosted on EC2 with Scalr (using scalr name servers). We received some feedback from users behind corporate firewalls that they cant access our service (while they can access the sites including the widget). This does not make sense to me since the service is using normal http calls on port 80 and our URL is quite new without any reason to be banned by firewalls. My questions are: 1. Why is the service is not accessible and what can I do about it? 2. Is it possible that one of the following is blocked by corporate firewalls: Amazon s3, the dynamic IP address provided by amazon, Scalr name servers. Any other possible reasons, way to check them and remedies for this? Thanks!

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• how to stream audio and video files, but use any media player on Windows (without using Windows file

  - by RamyenHead

  I want to access and play media files on machine S (Windows XP) from machine C (Windows XP). Using Windows File Sharing ("share this folder" stuff), if it works, I would share the folder containing media files on machine S, and I would be able to play media files, sitting in front of C, using any media player I want. Windows somehow ensures that the remote files behave like local files. But Windows file sharing won't work for me, is there any alternative? If two machines were both Linux, I would install an SSH server on S and use Nautilus from C to access and play media files. The reason why I can't use Windows file sharing is, my campus use two different subnets, I have S and C on different subnets and it seems that the firewall governing the whole network in campus doesn't allow file sharing between different subnets. I tried changing Windows Firewall settings on S to allow C in, it still wouldn't work, so it must be the other firewall.

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• Windows Server 2003 Exchange OWA email file attachment relogin

  - by ton

  hello guys i have a exchange server running but there is a problem. when i use the web access and i click new email ad i click on the paperclip(to add a attachment) i select a file and then i click Add to upload it. but when my Oulook Web Access hangs its stays loading 10 or 20 seconds. and then it ask for my login again my username and password. when i fill my username and password in again the same happens its stays loading for 10 or 20 seconds and then it ask again for my username and password. can somebody help me on this pleas.

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• Installing a .deb file manually?

  - by stef

  apt-get install gitosis --fix-missing on my Linode still leads to a 404 (Failed to fetch http://ftp.debian.org/debian/pool/main/g/gitosis/gitosis_0.2+20080825-2_all.deb 404 Not Found [IP: 130.89.148.12 80] ) . The correct file location seems to be http://ftp.debian.org/debian/pool/main/g/gitosis/gitosis_0.2+20090917-11_all.deb Is there any way I can install this without apt-get, or point apt-get in the right direction somehow? Several other packages on my Debian Linode also point to 404, both from command line and virtualmin. EDIT: Machine details Debian 5.0 64bit (Latest 2.6 (2.6.39.1-x86_64-linode19)) EDIT2 My sources list # main repo deb http://ftp.debian.org/debian/ lenny main contrib non-free deb-src http://ftp.debian.org/debian/ lenny main contrib non-free deb http://security.debian.org/ lenny/updates main contrib non-free deb-src http://security.debian.org/ lenny/updates main contrib non-free deb http://volatile.debian.org/debian-volatile lenny/volatile main contrib non-free deb-src http://volatile.debian.org/debian-volatile lenny/volatile main contrib non-free # contrib & non-free repos #deb http://ftp.debian.org/debian/ lenny contrib non-free #deb-src http://ftp.debian.org/debian/ lenny contrib non-free #deb http://security.debian.org/debian/ lenny/updates contrib non-free #deb-src http://security.debian.org/debian/ lenny/updates contrib non-free deb http://software.virtualmin.com/gpl/debian/ virtualmin-lenny main deb http://software.virtualmin.com/gpl/debian/ virtualmin-universal main

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• Is it possible to use Hamachi as a standalone tunnel proxy tool?

  - by Mohammad

  Or will i need a remote computer with internet access. This is Hamachi

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• Transparently cache files from a network drive in Linux

  - by Vadim

  We have a Linux server that reads files from a network drive and processes them. In a common scenario, a user will log in and access the same files over and over again. The size of the files varies but the larger ones can be around 50+ Mb. The files seldom change. I was wondering if it's somehow possible to transparently cache the files. I don't want (or can) change the program the reads the files, nor do I control the protocol by which the files are accessed. I just want something to detect that I access a certain path, copy the file locally (if needed) and then read the file from the local drive. I've read about Bcache but can't figure out if it's what I need. Do you have any suggestions? Thanks, Vadim.

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• error when run browser

  - by KareemSaad

  I had this error when run internet explorer Unhandled exception at 0x7d5398e3 in IEXPLORE.EXE: 0xC0000005: Access violation writing location 0x00001bd0.

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• symbolic link and filezilla over sftp

  - by Doc

  I'm pretty new to debian, and I'm trying to set up a server. I created a user which can only access to his folder /home/username (and its subdirectory). Now I want to use that user for the webserver I set up, and I gave him access to /var/www but I can't see /var/www through sftp and i did a symbolic link like this root@server:/home/username# ln -s /var/www www root@server:/home/username# cd www root@server:/home/username/www# chown username:username * now, with filezilla, I can see www folder like this - but when I try to open it I get this - Where am I going wrong? sorry for my awful english, i hope you can understand my problem...

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• Network connectivity issues with Windows Store

  - by Duy Tran

  I have my Windows 8 Pro build 9200 installed on my Dell laptop. I want to install some new apps and updates from the Store but there might be some network problem that caused the downloading gauge showing up but not really running at all. I followed some instructions that switched from local user to my Microsoft account, but this "Please wait" screen keeps showing and I don't really know why. I still have internet access and can use some apps like People, Mail, etc. with my account logged in, I can surf the net using Firefox, Chrome and Internet Explorer. I did another test using cmd with ping -t google.com and it showed that my laptop has internet access. Anybody knows a solution to make the Store working properly? Or is there any workaround to switch to the Microsoft account instead of a local user account?

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• Is there an encrypted write-only file system for Linux?

  - by Grumbel

  I am searching for an encrypted filesystem for Linux that can be mounted in a write-only mode, by that I mean you should be able to mount it without supplying a password, yet still be able to write/append files, but neither should you be able to read the files you have written nor read the files already on the filesystem. Access to the files should only be given when the filesystem is mounted via the password. The purpose of this is to write log files or similar data that is only written, but never modified, without having the files themselves be exposed. File permissions don't help here as I want the data to be inaccessible even when the system is fully compromised. Does such a thing exist on Linux? Or if not, what would be the best alternative to create encrypted log files? My current workaround consists of simply piping the data through gpg --encrypt, which works, but is very cumbersome, as you can't easily get access to the filesystem as a whole, you have to pipe each file through gpg --decrypt manually.

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