Networking :: Secure System Design (300 Wireless Computers)

Mar 7, 2010

How to design secure fault tolerant network (routers, firewall, domain servers, etc) of 300 wireless computers separated in multiple buildings and floor with multiple users for each station mainly utilizing dtp and internet software?

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Ubuntu :: Vpn - Software That Can Install On 2 Computers To Have A Secure Communications?

Jan 3, 2011

A relative will soon be traveling to China to adopt a child. China is cracking down on communication tools like Skype. Some people are using Virtual Private Networks (VPN) to ensure they can communicate with families back home. I know nothing about VPNs so I have some questions.

1. Is VPN some kind of software that you can install on 2 computers to have a secure communications?

2. Is there something in Ubuntu's Software Center that I should try?

3. If China is cracking down on external communication, is VPN the best tool to ensure communication back home?

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Ubuntu Networking :: 10.04 Will Not Authenticate Secure Wireless?

Jun 6, 2010

however, until this morning I had only been using my wired connection with no problems but when I tried to connect to my home's WPA secured wireless network, it just would not connect. The network manager sees the network and when I click on it, a window pops up asking for authentication. I enter the passphrase, but still it will not connect. I'm using a Lenovo X61 LAPTOP (not tablet).

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Ubuntu Networking :: Cannot Connect To Secure Wireless Network

Jan 4, 2010

I have a Dell Inspiron 8600 laptop on which I recently installed Ubuntu 9.10. Most things work, but the wireless will not connect to my home wireless network (a Linksys WRT54G). (Cannot see any other WIFI antennas from here, so I don't know if it works on other networks). Ubuntu says I have an Intel PRO/Wireless 2200BG, Kernel Driver ipw2200.

When I try to look for a wireless network, Ubuntu doesn't see any. (Every other computer in the house does, Macs and PCs). I tried Connect to Hidden Wireless Network > New > and filled in the name and the WEP password that the Linksys gave me.When I select Connect to Hidden Wireless Network and select the network that I entered all the information for, the Connect button is always grayed out.

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Ubuntu Networking :: Connecting To Secure Wireless AP In Jaunty?

Jan 13, 2010

My brother is trying to connect his laptop to his university's secure wireless network and is running into some problems.

He is receiving the following error messages with private info removed:

Jan 13 09:42:52 laptop kernel: [ 91.744131] wlan0: associate with AP
Jan 13 09:42:52 laptop kernel: [ 91.746454] wlan0: RX AssocResp from REMOVED (capab=0x421 status=12 aid=0)


Also, in my research it appears that people that have Wireless problems often install the linux-backports to see if this fixes the issue.

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Ubuntu Networking :: Sharing Wireless Connection With Other Computers

Jan 27, 2010

I've got wired connection on my ubuntu and I set up a wireless network so I can share internet with other computers. I added another computer to the network, but it's asking for:
* an IP address
* router address
* subnet mask.
Where can I find these values?

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Ubuntu Networking :: Sharing Files Over Wireless With Other Computers

Mar 11, 2010

I got my somewhat older desktop running ubuntu 9.10 and I'm loving it so far. However a while ago while I was slightly intoxicated I boasted to my roommates that sharing files with this thing should be super easy, since it's linux and all that. Since then I've been trying to set up the desktop as a streaming media server, with no success. I found a pretty good guide on how to get Samba up and running on instructables. My laptop is part of a school domain. Since many of my roommates go to the same university, theirs are also part of that domain.

For those of you who aren't too familiar with Windows (anymore), your computer can either be part of a workgroup or a domain. A workgroup is intended for home networks and makes it easier to share files, which is what I'm trying to do, and what the guide calls for. I've illustrated the problem in the attached image. As you can see both computers connect to the same router. I don't think I really have to explain, but I just figured I should try to be as clear as possible.

My question to you is: is there any way that I can set up the ubuntu desktop, or samba, so that it can share files over the wireless network at home with the computers that run windows and are part of the school domain? I'm guessing I should somehow be able to access the desktop from another computer on the same network if I give it proper access. I just have no idea how to do it or where to look, since almost everything I encounter calls for putting the windows machine in a home workgroup.

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Ubuntu Networking :: Connecting To A Secure Wireless Network (WPA Or WPA2)

Sep 1, 2011

In setting up wireless connections I have ran into an array of problems. First, when I installed the new OS on my laptop I had to get the correct drivers and firmware for it to display and connect to any connections, had no problem here connecting to a secure wireless network (WPA or WPA2). I then installed Ubuntu on my desktop and had to find the correct driver for the Netgear WNDA3100v2 USB adapter, got it all installed with the Windows Wireless Drivers tool or w/e it is. This made all the available connections come up. I tried connecting with the WPA password I was given for the network and will not connect.

I had the guy managing the network change the one I connect to, to a WEP Passphrase Shared Key thinking this would solve my issue, still nothing. And also in doing so, now my laptop will not connect to the wireless network using the Passphrase. I do not want to go back to Windows, and I will be getting rid of my Lan connection soon so i need a solution to fix this wireless connection problem.

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Ubuntu Networking :: Using Laptop With Wireless To As Internet Source For Other Computers?

Jan 2, 2011

I have an old laptop with wireless, 2 desktop computers without wireless and an Allied Telesyn gigabit ethernet switch (specifically AT-GS908GB). Is it possible to hook the 3 computers into the switch and use the laptop's wireless as the internet source for the other 2?

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Networking :: Building System Router - Can't Access Computers On Other Side Of Network / Fix It?

May 20, 2009

I have built a linux router with a pc having two network cards. I am running ubuntu 8.10.

I have enabled forwarding on the router. One network ( connected to eth0 and another ( is connected to eth1.

The interfaces have addresses and

On any side side of the network, I can ping both interfaces on the router.

However when I ping a machine on the other side of the network, I get 100% packet loss.

I have not touched iptables on the router or any machines.

What I am doing wrong?

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Fedora :: Programs For System Electronic Design?

Mar 12, 2010

If there is any community or support where electronic programs exist, such as circuit design or programming of "PIC" and to record the "PIC". I appreciate your help! I am very interested as I am a student of Electronics Engineering and also Professor of electronics.

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Fedora Networking :: FC10 - Unusual System-config - Unable To Ping Other Computers Or Routers

Jun 2, 2009

I recently built my second general-purpose server, and recently installed fedora core 10 on it. The first thing I attempted to set up after installation was the network - and that's where it's gone wrong When editing a network device using the graphical system-config-network utility, I find that the subnet mask is being automatically changed to match the default gateway address every time I attempt to modify any of its settings (or sometimes even when I cancel the changes). This also means that I cannot set the subnet mask, as it simply won't accept my setting for it. I seem to be able to get around this glitch by setting the subnet mask using the shell version of the same utility, but that doesn't solve my network issue.

Even when I use the shell utility to fix the subnet mask, I'm unable to ping other computers or routers on the network even when ifconfig indicates that the desired ip address has been taken, and other computers on the network are also unable to see the server. I'm using a wired connection and a static IP address on a network with no DHCP.

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Programming :: Social Networking Database Design

Sep 9, 2010

As I am Carrying out a project to Design Social Networking Databases, I need 5 tables for designing it.My frontend being php and backend being Mysql.I need to know what are the 5 tables I can have and how to implement them.

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Ubuntu Networking :: Setting Up Web Design Test Server?

Dec 19, 2010

I do not know much at all when it comes to setting up hardware--servers, switches, etc.

I have a 1701HG 2Wire wireless router that I use for my home network. I have an old pentium 3 tower that is just laying around, and I want to be able to host my projects on it for testing. Basically, I just want to be able to do everything on my laptop and then upload it to the server for testing.

I have set up an Ubuntu LAMP server on the desktop and am able to do everything I want via SFTP; however, I want to be able to type in "projectx.local" in a browser on my laptop to go to one test site, "projectz.local" to go to another, etc.

Is this possible, since I do not have the server set up as my gateway? It is merely connected to the router like everything else.

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Fedora :: 11 Laptop Will Not See Other Computers On The Wireless Network?

Oct 10, 2009

I have a mainly windows house with a notebook running Fedora 11. The problem is that when this computer is on the wireless network it shows no computers on the network. It gives me the error that it can't retrieve the shared list from server. However when I am using it on the wired part of the same network it will see all of the other computers. I was wondering if anyone here could shed light on what might be going on. I am not sure if it is a setting on the computer or something to do with the router. However I don't think it has anything to do with the router because I have windows laptops that run on the same wireless access point and have no problem

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General :: Synchronize System Changes On Two Computers?

Aug 22, 2010

I have two computers with Ubuntu 10.10 on them, a desktop and a laptop. I have two options for handling them:
Try and keep them the same
Accept that they have different 'personalities' and branch off their on way

However, I've chosen the first option because I like to keep my files and settings the same on both computers. I am in the process of extracting a tar archive I made of my entire desktop's hard drive (9.7GiB) onto my laptop, so after this is done they will be exactly the same. However, upon turning the laptop on with my freshly-copied system, things will become different. If I take the laptop to school, for example, and do stuff there, then come back home, and do stuff on my desktop, how can I sync these computers (both ways!) with the new changes at the end of the day/week/whatever?

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OpenSUSE Wireless :: Connect To Bt Openzone Of Bt Fon But Not Secure Connection

Jun 22, 2011

I have a compaq pressario v6000 with broadcom wireless card bcm4312. I was running Suse 11.3 and one day the wireless stopped working so after several hours googling I gave up and installed 11.4 but I have exactley the same problem I can connect to my bt openzone or btfon network but not to my own secure network I have tried everything I can think of including disabling security settings on my homehub but I can't get it to work at all I have used network manager and traditional I just can't get it to work.

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Ubuntu :: Connect Multiple Computers To Wireless USB Dongle?

May 27, 2010

I recently purchased a wireless USB dongle. It works great. I am looking to connect multiple computers to that USB dongle. I wanted to know if anyone out there knows if it is possible to link multiple USB cables together like a reverse splitter.

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Debian :: Asynchronous Update System Between Two Computers

Jul 24, 2011

In a few months I am gonna be starting a website that handles credit card information.

A requirement of my servers is that they be fully self-maintaining.

By this is mean that they will download their own updates, restart them-self, and switch them-self back on after general house power failure (black out).

Is there a way in Linux to make the computer automatically reboot itself after download and installing an update (if it needs to). My Linux uses the apt package system, with Synaptic Package Manager/Update Manager.

Now here is another problem I found. When a customer has logged into my site, my computer won't register them as logged in when they've rebooted? Like, its going to issue them new cookies? Credit card transaction process will be have to be restarted?

What if I build two identical server running in sync with each other... sort of like RAID mirror.. and they both download and install updates, once their both ready to reboot. Computer 1 will reboot. On successful reboot, System 1 alerts System 2 that it successfully reboot and that System 2 may now reboot. This way the customers experience is not interrupted.

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Software :: Mirroring System Folders Between Two Computers

Sep 7, 2010

I'm trying to mirror an apt-cacher-ng cache between two computers. I have apt-cacher-ng installed on my laptop, and I have another machine running apt-cacher-ng. In order to keep them both up to date with each other and to make sure all the computers have all the updates, I've been trying to find effective ways to keep them matched.

- Unison looks like what I want, it would delete files that are deleted, and it would add files that are added. (the assumption is if they're deleted from one, they'd be deleted from others).
- Rsync seemed quite a bit easier, especially with the advanced permissions issues. Apt-cacher-ng uses a user called apt-cacher-ng.

Instead of giving root an ssh password, I wanted to just ssh as apt-cacher-ng. Then I can still get the files over the network, but without the root account being open.
So I ran:
passwd apt-cacher-ng
and when I sshed, it looked like it was working until it logged me out (almost immediately). So that's not working. What am I missing? Maybe there's a better tool then rsync for this?

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Software :: Secure Usb Port Of System On Fedora 11 Platform.

Apr 13, 2010

hi i want to lock my usb port of system.i am using linux fedora 11 operating system. so for that purpose i want to know or i want the detection code that detect any external devices plug in to system.

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Security :: Ways To Secure Sendmail Or Secure Alternatives To Send Mail

Dec 1, 2010

I'm an Oracle DBA and started working for my current employer about 4 months ago. This past weekend an alert re: FS space brought my attention to /var/spool/clientmqueue (full of mail re: cron jobs) and the fact that sendmail is not running on our Linux servers.I'm told that the IT security team deemed sendmail too vulnerable so we don't run it.Aside from FS filling up and missing notification of issues with crontab entries, I'm concerned that we may be missing notification of potential issues. In other Unix/Linux environments I've seen emails from the print daemon when it experienced problems with specific jobs.

Are there other Linux facilities aside from cron and lpd that use email to advise the users of possible issues? Are there ways to secure sendmail or secure alternatives to sendmail? My primary need/desire is to make sure that emails regarding issues on the server get to the appropriate users. Secondary goal would be to have the ability to use mailx to send mail out. There is No need/desire to receive mail from outside.

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OpenSUSE Network :: Connecting Two Computers On LAN \ Both Computers Are Connected To A Switch With Cables?

Jan 31, 2011

im trying to connect two computers on lan.One computer has: VMWare Workstation and has Opensuse 11.3 mounted in it.The other computer has: VMWare Player and has Opensuse 11.3 mounted in it.Both computers are connected to a switch with cables.I have followed this guide in both computers:Depanati singuri calculatorul!: Opensuse 11.3 - configure local networkin order to setup a network.In one computer, if i go to: Computer---Network---Network folder, i only see one machine. When in fact i could see both of them right

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Ubuntu :: Automated Scheduled Backup System Waking Up Computers

Mar 24, 2010

I am looking for an automated backup system and I like bacula. I have 3 Notebooks and a Desktop computer that need regular backup. Now I don't want to let them run all night just to do the backuping, so I was thinking I could use wake-on-lan to have bacula wake up the machines, then do the backups, and shut them down afterswards. While this may work with devices on the ethernet, it won't work with the Notebooks on the wifi. So is it possible to have the Notebooks schedules to automatically wake up from suspend or shutdown ? Or is it possible to interject a shutdown command if it is after a cerain hour and call the bacula director to start the backup now?

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Security :: Secure Solution To Transfer Data Using Rsync Over Internet Between 2 System Server?

Jan 2, 2010

I'm looking for a most possible, secure solution to transfer data using rsync over Internet between 2 linux server.
I have 3 option: SSH, IPSEC and Kerberos.
Which one in your opinion should be most secure solution?

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Ubuntu Networking :: Wireless Gone After System Update

Mar 22, 2010

I have installed xubuntu with wubi from XP. The installation was OK, I have booted the system several times with no problem, all devices worked well. After a day, auto update have shown that I have lots of packages to update. I said OK, let's do it. After a restart the wifi led was not lit anymore. I am unable to discover any wifi networks.. Fortunately I still have my old XP to write to the forum.. What can I do? The hardware: Compal CL56 notebook with Intel Pro 2200BG wifi. (and ATI Mobility Radeon 9700 - which will cause the next problems.?)

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Ubuntu Networking :: Wireless Set Up On Headless System

Mar 29, 2011

I have a headless system running fine with eth0, but I need to move the system for a while and need to use wireless. I'm probably doing something wrong somewhere.So what I need is to leave eth0 set up and running when the lan cable is plugged in, but when the system is rebooted with lan cable unplugged the wireless card kicks in and takes over.I have put system back to just eth0 so I can start from scratch. I have two wireless cards installed at the moment, in the hope I can get one of them working and intend to remove one card later.

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Ubuntu Networking :: Best Wireless Card For System?

Aug 5, 2011

I have a desktop PC and I need to get a WI-FI card for it (built in or USB). Whats the cheapest and best wireless card that has Linux support?

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Ubuntu Networking :: Find Directions On Networking Two Computers Together In Order To Share Files?

Nov 20, 2010

I am having a heck of a time trying to find directions on networking my two computers together in order to share files. I have two machines running Ubuntu 10.10 Desktop & Netbook remix.

They are both connected to my wireless router to connect to the internet.

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Fedora Networking :: 12 - Can't Connect System To Wireless Network

Feb 9, 2010

I'm running the 64-bit version of Fedora 12 on a MacBookPro5,1 system. I am unable to connect to my wireless network, which shows up in the list of available wireless networks.

I will enter my password and the system will try for several seconds to establish a connection and then fail.

I know the network is fine because I can connect to it when I boot the computer in Mac OS X.

What can I try that will allow me to connect to my wireless network under Linux?

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