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• design a large scale network for an organization

  - by Essam

  i want to design a large scale network for an organization with HQ and two branches. i want to use a class A subnet. if i am using the network address 30.0.0.0 for the whole organization how can it be different from another organization company or whatever which is using the same address in another country? now i have the three locations for this organization,so i need 5 subnets [one for the HQ,two for branch A and branch B , one for connecting A to HQ and one for connecting branch B with HQ since i will use central DHCP server at the HQ,is that (number of subnetting) right? is it advisable to use class A or class B for this organization it term of address that will be wasted (let's say it is a university with two branches in two different states)?!

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• Network access to VM only from host ...

  - by Jamie

  I'm trying to do some testing of Ubuntu 10.04 Beta 2 Server in a VMWare environment. The host is XP, and the VM software is VMPlayer. Problem is, I want to be able to see the VM from the network, not just from the host. I can SSH into the VM from the host, but from any other machine on the network I can't even get the VM to respond to a ping. Going the other way (from the VM out) isn't a problem at all. The VM software did an 'easy installer' so I'm not really sure what was going on with the networking. Suggestions?

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• Steps to make sure network is not blacklisted...Again

  - by msindle

  I have an interesting issue. I have a client that just got blacklisted due to spam being sent out over the last 2 days. I have my firewall configured to only allow mail to go outbound on port 25 from our mail server (Exchange 2010) exclusively and I have verified that there are no open relay's on our transport rules. We are running Vipre Business and after running deep scans with updated definitions all computers come back clean. I ran a message tracking report on our Exchange server that shows all mail sent via the mail server over the last couple of weeks and didn't see anything malicious or out of the ordinary. I have also verified that there are no home devices or rouge computers on the network. For all practical purposes it appears that the network is clean, but we still wound up on 5 or 6 blacklists...Where should I start looking next? Is there a "best practices" guide that can help eradicate this issue? Thanks in advance! msindle

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• What is the best graphical terminal/console for Linux?

  - by bgy

  Well, I'm often tired of the basic functionalities of terminal provided as is when installing a new distribution. What is the best console in a graphical mode? For now, all I want to is: Tabs management Easy copy/paste (^C/^V support) UTF-8 support Should be available for both KDE/Gnome environnement Please be argumentative, don't answer with 'my favorite is' only. Try to tell me why and which features it offers.

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• Colorizing your terminal and shell environment?

  - by Stefan Lasiewski

  I spend most of my time working in Unix environments and using Terminal emulators. I try to use color on the commandline, because color makes the output more useful and intuitive. What are some good ways to add color to my terminal environment? What tricks do you do? What pitfals have you encountered? Unfortunately, support for color is wildly variable depending on terminal type, OS, TERM setting, utility, buggy implementations, etc. Here's what I do currently, after alot of experimentation: I tend to set 'TERM=xterm-color', which is supported on most hosts (but not all). I work on a number of different hosts, different OS versions, etc. I'm trying to keep things simple and generic, if possible. Many OSs set things like 'dircolors' and by default, and I don't want to modify this everywhere. So I try to stick with the defaults. Instead tweak my Terminal's color configuration. Use color for some unix commands (ls, grep, less, vim) and the Bash prompt. These commands seem to the standard "ANSI escape sequences" I've managed to find some settings which are widely supported, and which don't print gobbledygook characters in older environments (even FreeBSD4!) (For the most part). From my .bash_profile ### Color support # The Terminal application typically does 'export TERM=term=color' # Some terminal types will print Black, White & underlined with these settings. OS=`uname -s` case "$OS" in "SunOS" ) # Solaris9 ls doesn't allow color, so use special characters instead. LS_OPTS='-F' ;; "Linux" ) # GNU tools supports colors! See dircolors to customize colors export LS_OPTS='--color=auto' # Color support using 'less -R' alias less='less --RAW-CONTROL-CHARS' alias ls='ls ${LS_OPTS} export GREP_OPTIONS="--color=auto" ;; "Darwin"|"FreeBSD") # Most FreeBSD & Apple Darwin supports colors # LS_OPTS="-G" export CLICOLOR=true alias less='less --RAW-CONTROL-CHARS' export GREP_OPTIONS="--color=auto" ;; esac

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• Setting up Kerberos SSO in Windows 2008 network

  - by Arturs Licis

  We recently introduced Kerberos (SPNEGO) Single Sign-on in our web-portal, and tested it on a Windows network with Windows 2003 domain controller. Now, trying to test it on Windows 2008 R2 controlled network, SSO just doesn't work due to defective tokens. Up to the moment I was pretty sure that there's something wrong about environment and that were NTLM tokens. We double checked IE settings etc, but nothing helped. Then we checked the following settings for both users (logged on a client test-machine, and the one used as a Service Principal): This account supports Kerberos AES 128 bit encryption. This account supports Kerberos AES 256 bit encryption. .. and error message changed to ' GSSException: Failure unspecified at GSS-API level (Mechanism level: Encryption type AES256CTS mode with HMAC SHA1-96 is not supported/enabled) It makes me think that Internet Explorer receives Kerberos tokens at all times, and there's just some configuration missing, or it was ktpass.exe to be incorrectly executed. Here's how ktpass.exe was invoked: C:ktpass /out portal1.keytab /mapuser USER /princ HTTP/[email protected] /pass *

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• Deployment of broadband network

  - by sthustfo

  Hi all, My query is related to broadband network deployment. I have a DSL modem connection provided by my operator. Now the DSL modem has a built-in NAT and DHCP server, hence it allocates IP addresses to any client devices (laptops, PC, mobile) that connect to it. However, the DSL modem also gets a public IP address X that is provisioned by the operator. My question is Whether this IP address X provisioned by operator is an IP address that is directly on the public Internet? Is it likely (practical scenario) that my broadband operator will put in one more NAT+DHCP server and provide IP addresses to all the modems within his broadband network. In this case, the IP addresses allotted to the modem devices will not be directly on the public Internet. Thanks in advance.

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• Setting DNS Siffix for multiple network adapters in a VM

  - by arun_bh

  Is there a way to set the DNS Suffix for multiple network adapters in a VM using the sysprep file? We are trying to setup Windows 2003 VMs with 2 network adapters. In the one adapter case the sysprep we are able to set the suffix using DNSDomain. But this doesnt work in the 2 adapter case. The The VM is setup corrently though without any issues but one of our apps relies on the DNS Suffix value to work correctly. Thanks in advance.

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• Mac OS X Server mobile account VS Time Machine Network Backup

  - by elhombre

  I am installing a Server @home to manage the mac client's of my family. First I wanted to make time machine Backups over the internal network to an external Hard-drive which is connected to my Mac OS X Server (10.6) but when I read about the mobile accounts and it's synchronization features I got a little bit irritated what the differences between the two Services are. So where are the differences between a mobile account and a Time Machine Backup which is made over the network? Can the synchronized mobile Account be backup to an external Harddisk, if yes, how?

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• How to disable VGA on new server... reversibly?

  - by Javawag

  Strange question here. I have a server with 1GB of RAM, however when booted this shows as 768MB. I've discovered the reason for it – and that is that it has an unboard graphics card which shares memory with main RAM. Running Ubuntu Server, it doesn't actually ever use anything graphical – it's all set up to be SSH'd into and therefore there's no need to use the VGA. I believe there may be a setting to switch off VGA/graphics card in BIOS, but my question to you guys is: is this recommended? and if I turn it off, then how would I turn it back on again in BIOS (given that with it off, I wouldn't be able to see the option to turn it on as there would be no graphics output!!)?

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• See network computer description in Explorer

  - by John Gardeniers

  When viewing the list of network computers in Windows Explorer on a Win 7 machine there appears to be no way of readily seeing the description field, which makes that pretty well useless. I believe this problem started with Vista but I'm seeing it for the first time because I was fortunate enough to skip over Vista. We're currently rolling out Win 7 on new boxes and although I'm changing the naming system to something more sensible, the old boxes have names such as FWS01, FWS02, etc. Managing a network of computers with such names is made more difficult when you can't readily see who's machine each one is. Googling the problem brought up a workaround involving creating a shortcut on an XP machine and copying that to the Win 7 box but that's a long way from ideal. Is there some kind of hack that can be applied to machines, the operator of which needs to be able to see the description field?

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• Speed up file access on home network

  - by kurasa

  I have 2 PCs (Windows 7 Ultimate) and a Mac running Windows 7 using vmware fusion on my home network tied together using WRN1000 NETGEAR Router On one of the PC's I have a set of file (MYOB .myo). These use a data source to access the data in the files. Operations (reading,writing) to the .myo on the PC which hosts the files is fine but the other 2 it is painfully slow/unreliable and I am wondering what I can do to speed this up. Some ideas I have are 1. Turn off the Windows firewall on all the windows installations on the home network 2. Buy another router. Specifically a router which I can connect a USB flash drive on the back where I can put the .myo files and all the PC can access the files from the USB flash drive on the router (does this speed things up?) Any advice greatly appreciated on how I can speed up this access to data

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• Accesing internet with Host-Only network VirtualBox

  - by Bibo

  I have two VMs in my VirtualBox. Both are FreeBSD and should communicate between each other. I have created network with DHCP enabled and set like this: Server Address 10.10.10.1 Server Mask 255.255.255.0 Lower Address Bound 10.10.10.100 Upper Address Bound 10.10.10.200 My VMs are pinging each other and getting right ip adress. This is what I must have and can´t change. Now I want to access internet from one VM and I found that I must use two network cards but I don´t know how to set the second one. I am new with VirtualBox and this stuff so if you count with this in you answer I would appreciate that. And I have Windows 8 as host system if it´s matter.

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• Loss of wireless network connectivity when playing video via HDMI cable

  - by Jeff Fohl

  Hi Folks - New to Super User, so I hope this question fits in with the guidelines. Very strange problem I am having, and I am at a loss as to how to continue troubleshooting this one. The basic problem is that when I attempt to watch streamed video on a particular display device (an Optoma HD180 projector), my network connectivity drops like a stone to barely measurable levels. This is my setup: I have a Dell H2C 730x running Windows 7 64bit. This particular computer has two ATI Radeon HD 4800 video cards. I have two Samsung 22" monitors connected to one card, and an Optoma HD180 digital projector connected to the other card via an HDMI cable. My internet connection is normally a reliable 6Mbps. The problem I am having occurs when I stream video (or even just browse the web) on the Optoma Projector. When I do this, my internet connection drops to practically zero (just a few kilobits per second). When I move the browser away from the projector, and over to one of my Samsung monitors, the internet connection comes right back. Note that the Optoma projector is on and enabled as a third monitor all this time. I can move the mouse around on the projector without triggering the problem. I tried pinging my router when I was playing a movie on one of the monitors, and I get a 1 millisecond response. However, when I have the movie playing on the Optoma projecter, pinging the router gives me response times in the hundreds of milliseconds, or times out completely. So, it clearly is something local to my machine - and not some sort of throttling occurring down the line. I would think that it is possibly something to do with the HDMI driver conflicting somehow with my network driver (which is a USB-based wireless connection). This one has me really stumped. Anyone have any ideas? EDIT: I am now leaning towards the possibility that the HDMI cable is somehow interfering with the wireless network, when large amounts of data are being pushed through the cable. Is this possible?

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• Diagnosing extremely slow network operations.

  - by Chris Becke

  The network: * A windows 7 PC with 2 NICs - one connected to an old style ethernet hub - the other to the internet - with internet sharing enabled * An Apple iMac connected to the hub, successfully utilizing the ICS to access the internet. My problem: Using the Mac, copying from the internet is fast. However, if I connect to a SMB: share on the Windows 7 PC and try and copy anything a few kb the copy operation is appallingly slow with my network card using the Windows 7 control panel showing ~.1% utilization. The NICs are 100Mbs and show a 10x larger throughput (now ~1%) if I download large files over the internet using the Mac. WTF?

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• How to fix the IE8 favorites menu?

  - by Lance Roberts

  I'm using Windows XP and Internet Explorer 8, and occasionally one off my favorites (Link) folders will get a very small box in the upper right corner (on the favorites menu drop down itself) and not open at all. I can't figure out how it got there or how to disable it, and I have to completely shut IE down and restart it to get rid of it. Any clues on what's going on?

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• Reading line for Ubuntu users

  - by Willy Levine

  Normally when I read a book I use a bookmark held horizontally under the current line I'm reading to help me keep my eyes on the right spot. When I read a PDF or other document on my computer I would like to be able to do the same thing, only with a line on the screen controlled by the up and down arrow keys. Any suggestions for an application which would do this? I'm a Ubuntu Linux user.

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• Awesome WM: Goodbye UI

  - by Håvard Geithus

  Sometimes some of my UI's disappear, but the processes they belong to lives on. So far it has happened to gnome-terminal, emacs, eclipse and evince. I've only experienced this behavior with the Awesome Window Manager. Any ideas how to fix it? Update: It has also happened to a popped out Gmail chat window . When I close the main Gmail window, it warns me that the invisible chat window will also be closed.

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• Menu command stuck on screen

  - by 280Z28

  For some reason, periodically when I select a menu command, the command label gets "stuck" on the screen and won't go away. I can close all open applications, including whichever one I was using when it got stuck, but it still won't go away. In the screenshot below, I opened an new instance of IE just to show how the label stays on top. The label was not created by this instance of IE. Edit with the source: The label that gets stuck is the first menu command I select in IE. If a label is already stuck, a new one does not get stuck (regardless of which instance(s) of IE are involved). Based on this knowledge, I now just open IE on my secondary monitor, carefully open the context menu so the Properties command is in the bottom corner, and click it. This is not a solution... The label never moves and is transparent to mouse input (if I click it, it's as if I clicked the item behind it). The label does not go away if I close all running applications. I haven't tried stopping services or closing system tray items like Live Mesh. The label does go away if I change the screen resolution and then change it back. Any ideas how I can stop this from happening? It's happened a half dozen times since yesterday and it's becoming quite disrupting to my work. Obviously I added the circle in MS Paint. That part isn't stuck. ;)

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• fstab mount after network initialization

  - by Philip

  I'm automatically mounting a NFS with fstab. Sometimes the mount fails because the hostname of the NFS mount cannot be resolved (getaddrinfo failed). I'm assuming that this happens because the network initialization is slower than the mounts. Is there any way to initialize the network before mounting any devices? I'm already using _netdev as a mount option but this does not help. This is my current fstab file: # <file system> <mount point> <type> <options> <dump> <pass> /dev/md2 / ext3 errors=remount-ro 0 1 /dev/md1 /boot ext3 errors=remount-ro 0 1 /dev/sda3 swap swap defaults 0 0 /dev/sdb3 swap swap defaults 0 0 connect.mygluster.net:/data /var/gluster/data glusterfs ro,_netdev 0

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• Windows 7 wifi reports "no network access" and "no internet access" but connects in fedora

  - by rick2047

  I am running windows 7 home basic (64bit) on a Acer 5742G laptop with Atheos wifi adapter in it. Yesterday, I hiberneted my computer as I always do and up untill then the wifi was working fine. When I booted my computer up again today I started having a strange problem: It detects my wifi but after connecting to it, it keeps on oscillating between states of no network access and no internet access. I can't connect to anything (the internet or my router). I tried to reset my internet protocol stack using this fixit file. I also tried to uninstall and reinstall my network driver. Neither helped. I am using the same laptop's fedora installation right now and the wifi is working perfectly fine. Please help. Edit To add additional details, I have Microsoft Security essentials as my antivirus software and I haven't messed with the firewall or the router configurations.

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• IP Connflict on network

  - by PSU_Kardi

  I keep getting an IP conflict on my home network and can't figure out why. I'm running a Belkin-N wireless router that has an Ethernet connection to my 360 and a wireless connection running to my laptop. It's WPA2 encryption and I have a nice password on my router consisting of letters , numbers and special characters. But for some reason I keep getting IP conflicts at night time...By the time I look into the problem I don't see anyone else on the network. Is my router giving me false positives?

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• Can a virtual mikrotik box bridge a hyper-v internal network with a hyper-v external network?

  - by mcfrosty

  I am trying to set up a Mikrotik router as a transparent firewall on my network. I got the machine working on a hardware MT box, but my boss wants the MT virtualized. I have been trying the set up where my virtual windows box talks to the Mikrotik via private or internal network on the Hyper-V host. I can get the two machines to talk, but as soon as I set up a bridge on the MT, all traffic ceases between the two. Is it possible to create a bridge for this purpose (having the MT silently in front of my firewalled server)? I could really use some help.

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• Does Cisco anyconnect replace original network connection session?

  - by Stan

  When using Cisco anyconnect VPN, it seems the existing network connection is still going through old connection session (Is there any way to find out)? The reason is because when using Cisco VPN client connect to gateway, usually the Messenger Live, Skype will be disconnected and requires to reconnect. But using anyconnect doesn't need to reconnect. So I am guessing if those old sessions still go through original network connection. Which means, both connection is existing at the same time. Take my case for example: connection 1: wireless NIC - cable modem - my cable ISP - internet connection 2: anyconnect - wireless NIC - cable modem - my cable ISP - VPN gateway - internet Am I correct? Is there any way to check this? Thanks.

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• Logging full network connection like in browser

  - by pokemarine

  Can I set my browser or download a special application to log/download everything that is going through network while browsing a site? When I open a website in Firefox, it downloads the files to temporary folders, but I need everything, and by everything I mean full Ajax request logging, image downloading...etc Every file that is downloaded while browsing sites (and not temporary, I need them later, so It should log and categorize it somehow). Otherwise: I want to automatically save everything you can see in the browser's network tab (after pressing F12) and not just the response, also need the information about what it sent and what it got back.

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