Networking :: Setting Up Network Between 3 Centos In Virtualbox
Oct 24, 2009
I am trying to learn about networking and am looking to set up a mini network between three bare bones Centos machines in Virtualbox. I set up the machines with a static IP. In the Virtualbox I am using NAT and have the IPs as follows
Centos-1
IP: 10.0.2.15
Gateway: 10.0.2.2
DNS: 10.0.2.3
Centos-2
IP: 10.0.2.16
Gateway: 10.0.2.2
DNS: 10.0.2.3
Centos-3
IP: 10.0.2.17
Gateway: 10.0.2.2
DNS: 10.0.2.3
On all machines i can ping google.com, and yum updates, but I can not ping any other machine. It says they are unreachable. NOt really sure what to do. Any help would be much appreciated.
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Oct 26, 2010
So I'm wanting to learn a bit more about networking (ok, ALOT more), and I was thinking of trying to setup a virtual network via Virtualbox on my desktop, and as seperated from the internet as humanly possible (preferably no connection whatsoever).
Ignoring a few of the obvious problems (like my little dual core potentially running half a dozen VMs on 2G RAM), I am wanting some guidance as to what programs I would need or some documentation on setting things up.
I have no real clue where I would want to start with this, but I want it as a testbed for future toying with, to learn from, and just generally as something for me to hack at to see what does what, how, and why.
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May 23, 2011
The only things i need out of it are: mars_nwe (Netware server under Linux) and a reverse telnet server (the dos machine is a bbs) I need the virtual server to support a very old dos machine, and while i COULD use samba for drive mapping, the VNC server I'm useing on the dos machine is a progrm called TINY which pretty much means i'm stuck useing the novell dos network stack.
how best to configure opensuse for this? I'm running the install off of the live-dvd which has quite a bit selected by default. I'm not in need of an x-server or a desktop manager, as this will be a set it up and forget about it once it works VM
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Jan 18, 2011
I set up a bridge device but I can not figure out how to pass parameters into the ifcfg-vmbr0 in particular I need to pass:
maxage
ageing
fd and stp seems to be passed by DELAY=0 and STP=on the others? I have not found anything in the post, tips, docs how could I do?
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Feb 19, 2010
I just started setting up a linux box in the office...I have some experience with ssh commands but not setting up a linux system and stuff.The box is connected to our network but I have no clue how to make windows & osx talk with it. How can I go by doing that and also setting up an apache server to be able to connect through network. Right now I have apache/linux/mysql running it works when i go to localhost, but I would also like to let all the computers in office to access it. I would guess that will deal with virtual host which I know how to setup. I just need to setup an IP.
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Feb 16, 2010
I've been trying to understand how Linux creates the network/interfaces on a machine (been reading the Linux admin guide), but as I'm pretty new to this subject, I've got lost in the forest.
To provide with my goal:
1.) Learn about network setups on Linux
2.) Be able to maintain my own (virtual) network
3.) Configure my (virtual) network
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Mar 4, 2010
neeed help setting up a network printer on centos 5.2
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Aug 21, 2010
VirtualBox-3.2.8 (the non-free version) seems to be able to tell my wlan0 connection to 'split' into 2 IP addresses: one for the OS inside VirtualBox and one for the host. My router runs Tomato and I can see both real and virtual machines with different IP addresses in the device list (I can also visit httpd running on my host machine from inside the virtual machine). Is it possible to replicate this outside of VirtualBox?
In my case, I would like to be able to 'split' wlan0 into 2 with one IP address for normal network use and the other 'assigned' to eth0. eth0 is "shared to other computers" from NetworkManager and is currently connected to a Belkin router. My goal is to have this Belkin router assigned an address that all machines in my Tomato network can access (I have an OpenBSD 4.7 home server connected to the Belkin).
Whilst VirtualBox was running I tried to see if bridge-utils was being used:
Code:
[root@1 ~]# brctl show
bridge namebridge idSTP enabledinterfaces
...but it appears as though it isn't.
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Jan 27, 2011
I have Fedora 14 installed in VirtualBox, running in MS Server 2008.There is Oracle 10g software installed in Fedora 14.How can I configure connection to Fedora 14 from MS Server?Anything I've done is useless.I need to open port 1521.I can ping Fedora from MS Server. I can make connection "telnet localhost 1521" succesfuly in Fedora. But that's all.
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Jan 15, 2010
I am running a Centos 5 x86_64 guest with VirtualBox 3.1.2.The virtio modules are loaded, but the virtual interface is not detected.Anyone else use the new virtio network drivers with virtual box and know how to get this to work?
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Feb 13, 2010
I currently have VirtualBox installed on my Ubuntu 9.10 Desktop. I have windows xp as a guest os and it has network shares on it. My question is, is there a way for another computer to access those network drives on the guest os in virtualbox? I don't want to search for hours on end on google, a simple no would be fine - however if it is possible let me know because when I am in windows on another computer that has windows as a host os it sees it in the windows network folder but it says "....network location not found" or something similar but it still shows a pc picture of the virtual os of the virtual box program running in ubuntu.
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Jun 23, 2010
I am trying to set up samba in my CentOS virtual machine that is running on a Windows 7 host. I have found a tutorial in the How-Tos on this site but I'm not sure if they are exact and I'm paranoid about messing something up. The link to the tutorial is below. Is there anything that I should do different or anything that I should be aware of? Also, once this is set up, how do I transfer files between the two machines? Please note: I am very inexperienced in the IT field. [URL]...
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Nov 14, 2009
I'm trying to seup my dual ethernet card. One to go to the internet and the other to serve the LAN. Do I need a router for the NIC that will serving the LAN and another one to the NIC that will be connected to the internet? I don't want the LAN computers to connect to the internet. Can someone please give me a description on how to set this connection. And yes I will be using my server as a DHCP and DNS BIND.
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Mar 18, 2010
I am configuring a new installation of CentOS 5.4 with the goal of setting up a server. Ive been through the installation and set up everything that I thought that I had to setup. Im getting into CentOS because my work utilizes this distribution. I do have some debian experience, and I have used Ubuntu on both server and desktop platforms.
Now, when setting up Ubuntu, I found that I was able to get networking up much easier. During the initial installation it had asked me to choose between DHCP or manual configuration. As this is going to be a server I want it setup with a static IP. But for some reason no matter what I do I can not get the machine connected. I go so far as trying to do a 'yum update' and I can not make a connection.
A few things Ive noticed that might be applicable here . . . . .
For DNS servers, I am unsure exactly what I need to put here. My ISP is Cox. I am not sure what NS's to put there for them, so I thought that I would be able to use third party DNS servers such as OpenDNS or the Google Public DNS. I know that I have setup my debian server like that with no issues. Also when setting up my debian server it prepopulated certain areas that I am required to fill when setting up CentOS. Example, when setting up localhost.localdomain -- I would choose my hostname and local domain was prepopulated as ph.cox.net. I dont know if this is something that I have to use, or if it would change if I am using third party DNS.
My resolv.conf file looks like this
search ph.cox.net
nameserver (IP address of third party dns either opendns or google)
nameserver (IP address of third party dns either opendns or google)
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Apr 20, 2010
I'm trying Ubuntu for the first time; it's actually the first time I've messed with Linux at all-- and, well, it's kind of intimidating. One of my hobbies is playing with dead computers, and long story short, I have Ubuntu installed to a partition on an external drive connected to an older Dell desktop with no internal storage to call its own. The only network adapter I have to spare right now is the rather wimpy USB one that came with said desktop. I have the CD with the drivers to it, but I think the Linux drivers on it are for a different distribution. Am I going to need to scrounge up another network card or adapter, or am I going to have to start sheepishly asking ridiculous questions regarding basic operation of the command console?
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Apr 28, 2010
I have two laptops with Ubuntu 9.10
I want to connect them with a wireless router. phillips snb5600 router.
So I can go online and share files with both laptops
My LG E500 laptop to function as a modem with a connection to the internet with a 3g usb modem.
There are built-in wireless LG E500.
My other laptop is an old webtech without wireless built in, but I have a wireless USB thing fully with snb5600 Router. Ubuntu can find the wireless USB thing. so it's not a problem.
Both laptops can also connect with the router with cable.
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Mar 28, 2011
I recently purchased an hp 3050 printer because of it's wireless functionality. I found this (click me) where someone got it working. I tried to follow it step by step, but I couldn't get the ad-hoc network to work reliably.
I used the network manager to locate the printer's ad hoc network (it correctly identified it as ad-hoc) I then edited this connection, made it a "Link-local only" network in the ipv4 tab and then connected.
Usually what happens is that networkmanager claims that it has connected. I get a signal strength and everything, but I can't actually communicate with the printer. I entered the ip address (into firefox) given to me by asking the printer to print it's network settings, and I don't get a response.
Notice that I said "usually". I've tried this many times, and one time, I actually connected to the printer, got the browser interface, tried to use the interface to connect the printer to my wireless router, and failed (then the browser interface didn't work anymore [which of course would make sense if the printer tried to connect to the router, but I don't even know if I got far enough into the process for that to be the problem]). The printer does not show up as a device on my wireless router (my router has a list of all devices that are logged into it), so it failed somehow. I have never been able to duplicate that "success" again in spite of the fact that I've used the printers control panel to reset network defaults.
It seems that the people who were on the questions forum had no problem connecting the ad-hoc network. I kind of suspect that there is something wrong with the printer's wireless device.
PS: I noticed that hp-setup has an option to plug a wireless printer in via USB, set it up then it should work wirelessly, however, I couldn't get that to work with this printer.
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Apr 23, 2011
I can communicate to Windows perfectly (Internet sharing, file sharing, printer sharing, etc), but Windows controls everything, and I can't access any other Ubuntu PC, or host a printer or Internet connection. I have been fighting Samba for quite a long time, and I finally am able to access Windows shares from Ubuntu, but I want to host the shared folders (and everything else) on Ubuntu instead, because I have a bigger HD on it, and it is just a faster computer.
I tried personal file sharing and shared folders, but it doesn't work. I am also not able to access other Ubuntu PCs in the network, for printing, remote desktop, or file-sharing. All the computer are connected to the same Ethernet router. I'm using XP Home SP3, Ubuntu 10.04 x64, and a laptop running 11.04 beta 2.
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May 23, 2011
I have 4 computers at home: 1 XP, 1 Laptop w/ Win7, 1 Mac, and 1 Ubuntu (hey, I like to try most everything). Anyway, I'm wanting to set up a home server to save everything on so that I don't have 3-4 copies of one file floating around. I was planning on using Ubuntu because I've always heard that Linux is a good system for a server and that Ubuntu is one of the easiest to work with.
Anyway, I just installed the Ubuntu OS, and the only software that I installed with it was Samba (I don't have a printer hooked up to this computer). Is samba the best software to use for this, or is there any other option that would be easier to use? I've heard that with samba there are a lot of things you have to change using the CLI (something about chmod, whatever that is, and others like it), which doesn't bother me, I've used CLI since the years before Windows, good ol' DOS.
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Jul 4, 2011
I have 4 computers in my house, all with different OS's. (XP, Vista, 7, and Ubuntu) They would all be on Linux but haven't found a way to get my wife to stop using Windows. Anyways, I'd like to set up a home network to connect all 4 computers that would provide filesharing and print server. Does anybody know if this is even possible?
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Jul 24, 2011
I am trying to set a fix ip address with network manager since my router is not able to set it in order to make port forwarding for aMule.I managed to set the IP address and also de primary/secondary DNS on network manager.My question is: should I set the same DNS on bot the router and network manager?More detail: my router has its own DNS's other than those of OpenDNS. At the moment, I left those DNS's on the router and set up the OpenDNS ones on network manager.Is it correct or should I set the same DNS's on both the router and network manager? In this case, would it be a waste of time since there will be a sort of "double requesting" to the same DNS? Or one of the 2 DNS settings overrides the other one (for example, just the network manager DNS's are considered)?buntu NattyKernel 2.6.38-10-generic #46-Ubuntu SMPNetwork Manager version 0.8.4~git.20110318t152954.9c4c9a0-0ubuntu1
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Sep 13, 2010
I'm living at a friend's right now, and he's got a wireless access point in the house that I set my laptops wlan0 interface to route through the eth0 to my desktop. It's been working fine for internet sharing and internal networking ( ssh and ftp ) between the laptop and the desktop, but there's a problem with both subnets being able to communicate with each other, and I haven't been able to solve it with DNAT either.
The wireless access point is 192.168.0.1 and has its own lan on 192.168.0.0/24 of which my laptop is 192.168.0.5. I setup the little subnet I created by routing with the laptop to 192.168.1.0/24 and my desktop is 192.168.1.50. With shorewall I can configure iptables to DNAT all of my ssh traffic destined to 192.168.0.5 to 192.168.1.50, but the problem seems to occur when ssh on my desktop fails to connect rather than the DNAT failing.
Using iptraf I've seen that all of the routing does work properly, because I can see on the connection in iptraf that only the SYN packet is being sent from a 192.168.0.x address, there is no ACK packet sent back. I believe this is because in the connection dialog it always shows a 192.168.0.x ip as the source of the connection, but I don't have a route to 192.168.0.0/24 from 192.168.1.0/24 setup and I'm unsure of how to do so.
I'm pretty much in over my head because I don't know what is wrong, I thought it should work like this. Everything else from port configurations, to the configurations of the software itself seems fine so I don't think it's anything like that preventing a connection, but I can't think of what it would be aside from the lack of routing between each subnet.
Is there anyway to just add a route so that 192.168.1.0/24 and 192.168.0.0/24 can communicate with each other directly? I know there should be, I'm just not at all sure how it would be done.
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Dec 24, 2010
I am a complete noob with computers, especially when Linux is installed.The problem is that when I plug in my wired network cable - it just dont connect. Writes "disconnected".I do not use a modem, just a single cabel.I think the problem is just in my knowledge which numbers where to wirte and which one to tick.May you please write what I should wirte ( IP, MAC or smyh)and shouldnt write mannualy and where. What to open and even the smalest step.
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Oct 21, 2010
I know there are tons of help guides out there for this, and I have looked at and tried them all. I am trying to do something really simple, and just can't seem to get it working. I have been trying on and off for the better part of a week now, with not much luck. What I am tyring to do is have a Ubuntu 10.10 server serve out DHCP addresses and be the DNS for the local network. The local network will have no internet access, so it only needs to know the names of the local server. My network setup is as follows:
1: Windows Vista web server
2: Ubuntu DHCP3 and BIND server to give IP's and resolve local names.
3: A bunch of tablet computers connected via dhcp to the network, that need to access the web server on the Windows machine.
I have DHCP working nicely, but it fails to propagate the hostnames to the tablet computers. Unfortunately I need this to work, as the tablets do not have the capability of having a 'hosts' file.I have tried just about every self-help guide I can find, and just can't seem to get this work. Everything seems to work fine except for the name resolution. Any help would be great, I don't have that much hair left to pull out!
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Apr 27, 2009
I'm setting up a LDAP server to centralize the admin of a bunch of Centos 5.2 servers. I've got the LDAP server set up. I've got my client machines reading their autofs mount tables from LDAP. Now, I'd like to get name resolution working via LDAP.
Here's what I have so far:
1) /etc/nsswitch.conf contains the line "hosts: files dns ldap"
2) /etc/openldap/ldap.conf has URI and NSS_BASE_HOSTS set up to indicate root of "hosts" subtree in LDAP database.
3) "hosts" node in database is an "orginizationalUnit" object.
4) Below "hosts" I have a number of "ipHost" nodes defined with "cn" set to host name and "ipHostNumber" set to host's IP address
This setup doesn't work. Attempting to ping a host by name locks up. If I take the "ldap" keyword off of the "hosts:" entry in the nsswitch.conf file, the ping then returns immediately with "unknown host".
I'm surprised that there isn't better information available online on how to do this. I've found bits and pieces, but nothing concise. how to get name resolution working through LDAP?
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Jul 22, 2009
how to setup a broadband connection in Centos5.. My broadband connection is over a PPPoE link
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Sep 19, 2010
I'm trying to follow the instructions here to get my dell wireless NIC working in CentOS. I've got to step 3 but when I run the make command.But it does exist, as a link pointing to ../../../usr/src/kernels/2.6.18-194.el5-i686.
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Aug 5, 2010
what to set my Ram for when installing Windows XP Pro on a VirtualBox inside of Ubuntu 10.04 32Bit.
I will be using Windows to run Adobe Photoshop CS3 & Also Microsoft Word 2007 + Expressions for school.
The screen shot below are the specs on my Laptop.
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Dec 12, 2010
I am following [URL] for installing virtualbox on Fedora 14 but its throwing error while I run: /etc/init.d/vboxdrv setup.
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Apr 15, 2010
I need help setting up network printers I have two computers, they both have ubuntu on them. The internet comes in to the first computer on a usb modem, it is routed out from ethernet to wireless. I used CUPS on computer two and printed out a test page that worked, but it won't print out anything else.
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