General :: SSH Connection Limitations That Can Connect To One Single Machine (at The Same Time)?
Apr 4, 2011
I have a network of 100 machines, all with ubuntu Linux. Is there a limit to the number of machines that can connect to one single machine (at the same time)? For example, can I have 99 of my machines maintain continuous ssh connection to the 100th machine? Can I have every one of my machines (every one of the 100) maintain a continuous ssh connection to all other 99 machines? How much memory does each such a connection take?
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Apr 22, 2010
Since the upgrade from Lenny to Squeeze on my Notebook Toshiba Satellite Pro U200 with Intel Pro/Wireless 3945 ABG I have wireless connection problems.The connection breaks time to time and sometimes cannot connect automaticaly after restart. BTW I didn't change anything on the wireless or network configurations on the notebook and on the wiereless router.
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Jun 24, 2010
I currently run Win 7 and want to upgrade my computer to a server to accomplish the following... I have a VPN Service. I want the server machine to connect to a VPN providing a secure connection. Then, I want all the machines in the house (windows based) to connect through the server onto the VPN connection. Hopefully this makes sense. Would it be better to stick to Windows Server 2008 or switch to Ubuntu?
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Jun 13, 2010
how to make dsl setup and to acess both wireless and wired at a time.
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Apr 16, 2010
I just installed Fedora 13 on my ESX box.I have Fedora 13 Machine which was early having 1 network adapter.I added a new Interface type: e1000 to this VM.Now,My ifconfig says:
Code:
[root@fedora-13 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:50:56:BA:00:15
inet6 addr: fe80::250:56ff:feba:15/64 Scope:Link
All i was trying to provide IP to eth0 and eth1 through dhcp.is it possible to provide two IP address to eth0 and eth1 both through DHCP.
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Oct 13, 2010
I have question about the UNIX sockets. my goal is to connect multiple sockets from a single client to a single server and keep them open...I'm not sure if that is possible to create or not. Do you have any suggestion or an example of code?
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Oct 26, 2009
I have apache server running on Fedora 11. I want to test Self-signed certificate for SSL setup with Apache.HOw can I setup?
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Sep 29, 2010
I want to know the configuration steps for 2 mail servers on diferent IPs. But I want this setup on single vmware machine(debian).
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Nov 3, 2010
I saw a network once that used bonding (some people called it "port trunking") to combine two network cards into a single connection to get twice the bandwidth. I have a slow Wifi network with not so great reception. I actually have two spare WiFi cards and want to try to bond them so I can get a faster intranet (not internet). Has anyone successfully bonded two WiFi cards and had pleasant results? Is there an easier way to get better bandwidth with two cards? My router and my remote machine are both running Linux.
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Jun 23, 2010
If I have only 1 physical WLAN interface, is there some hackery that can be done so that it can be a client of an existing access point and at the same time also act as an access point for other clients? I have an existing 802.11g ADSL router, and I'm going to be building an HTPC which will have 802.11n. My laptop also has 802.11n, but at the moment it only connects at 54Mbps because thats what the AP supports. I'd like to be able to have the HTPC be a client of my ADSL router, but have my laptop be a client of the HTPC, so copying files to it will be faster.
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Sep 27, 2010
I installed OpenSuSE 11.3. The only "extra" package I put in after the install was VirtualBox-ose. The firewall is disabled. I gave the machine a static IP address. I can get to the Internet from the machine. I enabled sshd to start on boot with "chkconfig sshd on" and also verified the service is running on the machine. I can ssh user@localhost from the machine as well.
When I try to connect to SSH from another machine, I get a connection refused. I verify that the firewall is down. I also try to get to VNC -- same problem: Connection refused. I ping the machine for fun. If I try to SSH again, it sometimes gives me a logon? I would check the server logs for the connection refused, but I wouldn't know where to look. I started in /var/log/messages, but nothing seemed to jump out there. I also find it strange because I can RDP to a windows guest running under VirtualBox. The Windows guest uses Bridged Network and DHCP.
I also find it interesting that I sometimes type a "ping google.com" from the 11.3 box and it will just hang - no output. Then I open firefox and get to the internet. All of a sudden, ping starts to give output. Could this be a neetwork card issue? A configuration issue? I don't know where to start.
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May 18, 2010
I'm trying to connect from my XP machine (NX client for windows) to my linux machine (installed the 3 deb files to make it server), I get "connection refused". How can I see the default configuration of the server (Linux) side ? Am I'm missing something with the installation (samba?)?
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Mar 25, 2011
I'm just working on fedora for the first time for my proj. So having many difficulties. My first doubt is that is it possible to record audio in single user mode using fedora? I need it for my proj work..I tried arecord and rec in single user mode.. I'm getting an error stating pulse audio connect error. Connection refused..
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Jan 4, 2011
I'm considering setting up a virtual machine running Windows, with Ubuntu 10.10 as the host OS, for those cases where I have a Windows-only program.I understand that using a VM will lose some performance, but are there other limitations to what the OS in a virtual machine can do compared to "running on bare metal"?
For example:
Can a VM play games, like Dragon Age Origins or Civilization V? (Possibly with poorer framerates and/or lower resolution, but does it play at all?) Can a VM rip DVD/Blue-ray using AnyDVD or similar Windows program? Can a VM handle new hardware that requires dedicated drivers, but the drivers are only available for the OS running inside the VM? (Ex. graphics card, digital camera, card reader for smart card authentication.) Is it possible to say anything about "general limitations" of VMs, or is this wholly dependent on the specific VM?
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Apr 26, 2011
I noticed that firefox sometimes uses a lot of memory. Can something like setrlimit be used to control it? I tried to use it on the command line, but it didn't work.
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Jun 17, 2010
What is the best Linux Mint backup tool that is most like Time Machine (that ships on Macs)?
The one thing that I want it to have similar to Time Machine is that it only backs up files that have been changed, therefore making for faster backups.
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Feb 20, 2011
I m trying to take a console of linux machine using putty. Whenever i connect to the machine and give password details to log into the machine it hangs for some time and then it allow the login.
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Sep 23, 2009
I am working on Fedora, I am trying to figure out if there is any way we can set limitations/rights to linux desktop, so that we can control which things user can access, like if i dont want user to have access to kde control center, and should not change the settings in it, or disable changing wallpaper,or disable changing screen saver. How that can be done in linux?
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Jan 4, 2011
During set-up of a home server (running Kubuntu 10.04), I created an admin user for performing administrative tasks that may require an unmounted home. This user has a home directory on the root partition of the box. The machine has an internet-facing SSH server, and I have restricted the set of users that can connect via SSH, but I would like to restrict it further by making admin only accessible from my laptop (or perhaps only from the local 192.168.1.0/24 range). I currently have only an
[Code]....
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Jul 27, 2010
I am facing problem while connection to host (Red Hat Enterprise Linux ES release 4 (Nahant Update 5)) via putty.
when ever i try to connect host machine via putty/ssh, connection is established succussfully but just after few minutes it disconnectes . same is the problem if i connect using VNC. I did't made any configuration changes in recent past, earlier every thing was fine.
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Apr 16, 2011
I remember it being really easy to add a printer attached to another computer using Ubuntu, but I don't remember exactly what made it so easy. All I know is that now that I have switched to Kubuntu the process has become much harder because now I have to find out some special locations, numbers etc. for it to connect to the printer. It's connected to a Windows XP machine on the other side of the house.
It says alot about 'contacting the network administrator' if I am unsure about what to put in. But I am more or less the network administrator. how to find out what numbers to put in so that my Linux machine can connect and print to the Windows machine? Or maybe someone knows a few commands to share? I go to Applications > Settings > System settings, Printer configuration, New Printer, New Network printer, and then there are a few options but I don't know which one to choose. Windows Printer via Samba, I guess? Then in the box that says smb://[enter stuff here] I need to put in info but I don't know how to find that info.
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Oct 20, 2010
In the right upper corner of your screen,you can see if you have a network connection or not.Most of the time I do not have one according to Networkmanager (?).So I have to enable my wired connection manually.I already tried a lot to change my settings so I would have a network connection at boot,but it doesn't seem to work....Firefox is in Offline modus when I logon..
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Mar 23, 2010
I have the impression that not that many people understand the scope and limitations of GNU General Public License. This is somehow my basic understanding of it. If I take a program covered under the GNU license, first of all I have the right to get the source code. Second, I can modify it at will. Third, I can redistribute it as will too but the new code will necessarily will have the same GNU license. This made me wonder how people actually can charge for software derived from Linux, for instance, Red Hat. Well, my impression is that they really make profit only out of services. In this thread [URL] I think I found a lot of confusion, even from a moderator (not intended to offend). Red Hat is based on Linux and it is necessarily covered under GNU. Somebody probably bought the program from RHE and can make it available at no cost.
Nevertheless, the moderator decided to warn the user. In this article [URL] it says the following:"Our training is not designed to promote vendor lock-in. Though these courses are based on Red Hat Enterprise Linux, the source code for [RHEL] is available to the community via the GPL [GNU General Public License]," said Red Hat spokewoman Leigh Day. This thread [URL] shows yet more confused people. Is there is a glitch in this type of license that prevents programs like RHEL to be redistributed for free? Why their license page doesn't mention GNU license? Or the problem is just that people get overwhelmed by this license and are afraid to be penalized and get paralyzed? By the way, RHEL is just the example. The key question is about the license!!
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Jun 3, 2010
I have a Fedora machine that was installed with Linux LVM. I took the drive of that machine, connect it to disk enclosure, and connect to another Linux machine via USB connection. I can see that the drive /dev/sda is there:
Code:
[root@dd ~]# /sbin/fdisk -l
Disk /dev/hda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes .....
I want to copy files from this drive. I try to mount it, but it didn't work. The /dev/sda1 is mounted fine, but it has only boot stuff.
Code:
[root@dd ~]# mount /dev/sda2 /mnt/drive
mount: you must specify the filesystem type
How I can mount the drive and copy my files from this drive.
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Aug 24, 2010
I have a main Ubuntu system and a virtual Windows system, set up using QEMU/KVM. So, I can start Windows using virt-manager and connect to it using a VNC client.But what I really want to have is a new Xorg display that is connected to this Windows system, so that e.g. CTRL-ALT-F8 shows Ubuntu, CTRL-ALT-F9 shows Windows. That'd be a real alternative to a Linux/Windows dual-boot setup.
I know that GDM had some option to connect to another X server (XDMCP), but I couldn't get this to work with GDM2/Ubuntu 10.4. Would this somehow also work to connect to a VNC server (like the virtual Windows system)? how to make Xorg provide a display for incoming VNC connections, but nothing on how to do the opposite.
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Feb 11, 2009
I have installed Ubuntu 8.10 Server Edition on Virtual Box. When I start the virtual machine I do not have connection to my home network. The router I have does not assign any IP address to this machine. Now I have some questions which I am finding hard to find answers for over the internet and other forums.
If I do have a network interface (I checked this using ifconfig -a) then is there a command to actually make the operating system connect to that network (something like repair on windows)?? Also what is the difference between a network interface with alias eth0 and eth5? I know that when it was eth0 the virtual machine used to connect to the network automatically. Now that it is eth5 it does not! I do not know however if this is related.
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Feb 7, 2010
Need help on a activating xDSL Connection on machine startup, i have configured the internet through it but every time when machine boots up...it is annoying to activate this interface manually. do guide on this....i am using Fedora core 12...and can you help on the firefox's "work offline" bottle neck.
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Nov 28, 2010
Okay so I am a total newb to linux. I installed Ubuntu using Wubi and am trying to figure out how to get my wireless connection working. It occurred to me I may not have the right driver for use with Ubuntu for the wireless connection at my house. I couldn't find anything on the web to help..it appears I have a realtek RTL8102E wireless card in my laptop. I have absolutely no idea how to resolve this situation..I've looked on the web, but everythings pretty confusing. If I could get the wireless working it would be a good first step.
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Jun 15, 2011
I have a wireless connection to the internet, as well as a wired connection to a local network. When the wired connection to my local network is enabled, the wireless connection to the internet no longer works until I disconnect the ethernet cable.
(This setup used to work just fine when I was using Windows, but now doesn't seem to work. I wasn't using IP aliasing in Windows, but I am now, which may be causing the problem.)
My original connection to the internet was a wired one, at eth0, so once I got wireless enabled (on eth1), I created an IP alias to my local network of eth0:1 which is a static IP on my local network. The only configuration I did at all was to add a file named /etc/sysconfig/network-scripts/ifcfg-eth0:1, with the following contents:
Code:
And NetworkManager just seemed to pick it up automatically - I didn't change anything else in NetworkManager or anywhere else.
(Also I use 'service NetworkManager start/stop' entirely rather than 'service network start/stop' to manage my connnections. i.e. I did 'chkconfig network off' when setting everything up initially.)
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Jan 3, 2010
I am running Ubuntu 9.10 x64 on a relatively old laptop and I find Grub is taking about 20 seconds to initially load before booting the system. The laptop only has a single 120GB hard drive, and I chose the "use entire disk" option when installing, so I do not have any fancy partitioning scheme.When the system boots I get the "LOADING GRUB" text displayed and then shortly after it just shows the flashing cursor with no text, and stays there for about 20 seconds. After that it finally starts loading the system.All the searching I have done only turned up solutions relevant to people with multiple hard drives. This was not an issue on Grub 1.
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