CentOS 5 Networking :: Laptop Doesn't Have Internet Connection
Jan 22, 2011
I have installed Centos 5 on my laptop.And I have installed Oracle databases and also VMWARE server 2 software on it.But I see no page opens in firefox browser on this laptop.I can't understand why.The laptop doesn't have internet connection. But the VMWare web access page where we can login to console and create virtual machines doesn't require internet access.I am a newbie to linux and also network issues.How to figure out what is the problem? Are there any step by step guide to investigate this issue?All the pages I open get stuck with "waiting for abc.com" etc.It never opens.Javascript is enabled for this browser.
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Feb 4, 2010
I have two linux laptops. Currently, I'm using both of them at work, side-by-side. Now the problem is, I'm connected to a wireless router, but the wireless only works on one of the laptops. So I'm stuck with one laptop that has no access to the internet. Both machines do, however, have working ethernet nic cards. So, I was wondering if I could use the laptop with the wireless connection to share the internet connection with my other linux machine and access the internet on both of them. Or as an alternative, just use the internet on the machine without wireless and be able to switch back and forth, that would increase my productivity like 30 fold.
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Mar 29, 2011
Machine brand: Acer 5253-BZ893 laptop
Ethernet controller: Atheros communication device 1083
Network controller: Broadcom Corp. Device 4357
iwconfig: no wireless extensions
network config: *-network UNCLAIMED
iwlist scan: Interface doesn't support scanning
Ubuntu release: 10.04.2
uname -mr: 2.6.32-28-generic x86_64
I have not been able to get an internet connection wired or wireless on my laptop. I downloaded the drivers from Acer's website and tried installing them using ndiswrapper. Still no luck.
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Jan 22, 2010
I attempted to download and install Linux XP and the installation appeared to be a success. But after install of course the system reboots. Well after rebooting before opening up the desktop it forces me to set up the domain or something It would not recognize my internet/network connection. My ISP provider doesn't use any type of authentic. My internet connection is automatically configured through my modem. How do I get Linux XP to recognize my internet connection and finish the final process so that I can load into desktop ?? I also had a very similar problem with Linux Ubuntu Studio as well. I installed it and I was able to get into the desktop but still was unable to establish an internet connection.
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Dec 10, 2010
My laptop has been working fine with ubuntu 10.04, and earlier today it shut down after running out of battery. I came to use itr and discovered that the wifi icon had disappeared from the panel bar, and it won't connect to the wireless networkor via a wired connection.I have had a play around with this, tried ping -c5 google.comresult was:ping: unknown host google.comand ping -c5 4.2.2.1result: onnect:etwork is unreachable.I have other computers connecting to this network and know that it is working fine.
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Oct 15, 2010
Since I have 3 Network cards in my Desktop PC I've configured it to act as a Router using GNU/Linux Ubuntu Lucid in combination with Samba so I could share my internet connection. It works on any laptop a connect to it using any of the network cards ports [regardless of the operating system installed on the Laptops], but when I plug that same network cable to any Desktop PC [regardless of the operating System installed] it doesn't even light the LED in the netcards. From the Client PC seems like nothing is plugged in the the netcards.
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Oct 16, 2010
I can connect to the internet on Win7 without issue. Boot to Ubuntu 10.10 amd64 & it works sometimes & sometimes it doesn't.
I've attached 4 screen photos; 2 when internet is working (Working ifcomfig & Working route -n) & 2 when internet is NOT-working (NonWorking ifcomfig & NonWorking route -n).
The 1st I notice when looking @ working ifconfig is line 3 under eth0, inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0, is missing on NonWorking ifconfig.
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Jul 27, 2010
I have a Centos5.4 64bit laptop, having an eth0 and a wlan0. I connect this wired eth0 to a wall socket to access Internet via DHCP (eg the assigned address is like 192.168.192.xx). I do not have access to the ADSL router. How can I turn this laptop into a Wifi access point to allow, say my Ipad or any wireless-only client, to access the Internet thru this laptop ?
That is, communication between iPad to laptop is wifi(ad-hoc connection ??), laptop to the ADSL router is wired LAN. The laptop need to have some bridging build in ? If you can refer me some concepts, then I can follow up from there.
Or better yet, has anybody does this before ?
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Jul 17, 2009
I am a convert from Ubuntu (9.04 kept freezing on my laptop; when it did work, many packages it seemed were outdated--ie only Eclipse 3.2, rdesktop was messed up [and apparently is also in Fedora]), and I am having some trouble with getting my wireless working.I am running Fedora 11.First off, there is a problem when trying to connect when using DHCP. NetworkManager gets to the second green dot, and then after a short while I am given a message that the connection was disconnected.
Configuring the interface manually, not using DHCP, allows the connection to complete. However, the internet is very slow. There is a 15-30 sec delay before website loading actually commences, and then another delay each time an ad must be fetched from another server.How can I fix this delay? I know I have encountered it in earlier versions of Ubuntu, but I can't remember how I fixed it.About the rdesktop problem, if anyone is able to help [maybe I should post another thread?], the cursor color (the color of the pointer) is inverted---where it should be white it is black, and where it should be black it is white. I use rdesktop a lot to connect to my terminal server in my basement. Any idea how to fix it?
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Mar 31, 2010
I'm having problems with my internet connection; it seems to be working fine then every other click of a page there is no connection, then I click it again a second later and it works. I am using a wired network connection plugged into an addon wireless router.
When I use ping under network tools it seems to be fine, then freezes halfway through and doesn't receive those few packets, giving me a transmission percentage of about 70%.
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May 2, 2010
After having trouble with Ubuntu 9.10 (solved with a nice modemmanager bug fix by a great user) here we are with the new Lucid Lynx: until now, just to be safe, I am trying my Nokia CS-10 USB stick (for wireless 3g connection) with the Live Ubuntu, and it doesn't even get recognized (no red light or anything else)...
Here's the log:
Code:
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Nov 12, 2010
i am a fresher to linux. presently i am using CentOS for getting some experience in that. but i have a problem with internet connection using in CentOS. i am using prolink USB ADSL2+ modem (H5200U). so, i request from all readers to give alternative answer.
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Apr 8, 2011
I have installed centos 5.5 / 64. Configured network but - no internet. On my router I see my pc and IP. On centos, Firewall and selinux are disabled. I try to disable network and activate network manager and reverse but no luck internet is not working. Try to ping my router 192.168.5.1
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Jun 9, 2011
I am fairly new on CentOS and am in the process of setting up a small home office network that shares Internet access through the Linux (CentOS) box.I have two network interface cards The Linux box is also the DHCP server. My challenge is to get the client machines to access the Internet! I have a PPP connection to the ISP. Essentially I followed these Instructions CENTOS REDHAT Internet Connection Sharing. Pretty straight forward but I am still not able to get clients to access the Internet. I defined the DNS server through DHCP (196.44.x.y). I assumed it has to do with default gateway and it is set as follows: on the Linx box the gateway is my ppp0 link. DHCP uses eth1 (LAN card) fixed IP as the gateway. All clients are reflecting this information. The firewall (iptables) is reflecting the FORWARDING and POSTROUTING rules as advised.
Is there a step I mioght have missed to get this working? I tried to Google but its not getting me far.
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Jul 5, 2011
I installed CentOS 5.6 (kernel: 2.6.18-238.12.1.el5) with X Window on my HP Compaq 6710b. I also downloaded the firmware iwl3945 for my Intel Pro Wireless 3945 and manually installed it, reloaded the iwl3945 module and enabled NetworkManager. I could then get the wireless network connection worked on my graphical environment. I installed additional software manually by using the terminal window (Applications --> Accessories --> Terminal) and everything worked perfectly.
However, when I switched to text-based environment by issuing the commend "sudo init 3" (changing the user level) and logging in as root, I could not get any internet connection. I tried to use lynx and I got the error message: "Unable to connect to remote host". I am a complete newbie in Linux and I tried to google and search for solution within centos.org but I could not find.
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Jan 4, 2011
I am setting up a Beowulf Cluster using CentOS 5.5. I have the head node with two NIC devices eth0 and eth1. eth0 is the one that is connected to the WAN while eth1 provides the internal LAN connection. I am trying to configure internet connection sharing with the slave nodes on the network so that I can update/install software as needed via ssh sessions using yum. I have set up the master node with the requisite changes to iptables to enable IPv4 forwarding. From my slave nodes I can ping ip address from the terminal, but my domain name resolution is not working. i.e. if I ping [URL] it can not resolve, but if I ping 74.125.224.50 (one of google's IP's) I can communicate with the machine without a problem. I also ran the configuration tool provided in the README section of the forum on the slave node and the master node. The links are:
[URL]
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Jan 9, 2011
I am running Ubuntu 10.10, and I would like to use my computer to share the internet connection from an ethernet port. For example, I would like to set up my computer as a wireless access point so I can create a network that other computers can connect to for internet.
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Mar 15, 2010
I've got an Asus G50 and when I try to connect it wirelessly there's no connection setup. I try to setup one and I get nothing. It will connect wired though.So how do I get it to see my wireless router?
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Jul 19, 2011
I cannot Browse Even Internet is Active. Connected using Mobile Broadband using Samsung Mobile USB MODEM. (Modem is recognized Successfully and Connection Shown as active!) I cant browse or even use apt-get update in terminal.. no use. (Even I can see the Gprs icon in the Mobile Phone). WiFi is Perfect in this ubuntu (everything is fine) and Mobile modem working Successfully in Windows too. I have attached the picture.please see it.so you will understand everything
=I==USED==WVDIAL==TOOL===TOOO=
root@saad-laptop:/home/saad# wvdialconf /etc/wvdial.conf
Editing `/etc/wvdial.conf'.
Scanning your serial ports for a modem.
Modem Port Scan<*1>: S0 S1 S2 S3
WvModem<*1>: Cannot get information for serial port.
ttyACM0<*1>: ATQ0 V1 E1 -- OK
ttyACM0<*1>: ATQ0 V1 E1 Z -- OK
ttyACM0<*1>: ATQ0 V1 E1 S0=0 -- OK
ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 -- OK
ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 -- OK
ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
ttyACM0<*1>: Modem Identifier: ATI -- SAMSUNG GT-C6112
ttyACM0<*1>: Speed 4800: AT -- OK
ttyACM0<*1>: Speed 9600: AT -- OK
ttyACM0<*1>: Speed 19200: AT -- OK
ttyACM0<*1>: Speed 38400: AT -- OK
ttyACM0<*1>: Speed 57600: AT -- OK
ttyACM0<*1>: Speed 115200: AT -- OK
ttyACM0<*1>: Speed 230400: AT -- OK
ttyACM0<*1>: Speed 460800: AT -- OK
ttyACM0<*1>: Max speed is 460800; that should be safe.
ttyACM0<*1>: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0 -- OK
Found an USB modem on /dev/ttyACM0.
Modem configuration written to /etc/wvdial.conf.
ttyACM0<Info>: Speed 460800; init "ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0"
=EXECUTING==WVDIAL==AND==ITS=RESULT=
root@saad-laptop:/home/saad# wvdial
--> WvDial: Internet dialer version 1.60
--> Cannot get information for serial port.
--> Initializing modem.
--> Sending: ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
--> Sending: AT+CGDCONT=1,"IP","imis"
AT+CGDCONT=1,"IP","imis"
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Mon Jul 18 11:26:54 2011
--> Pid of pppd: 3062
--> Using interface ppp0 ....
=CONFIGURATION==IN==WVDIAL.CONF=
/etc/wvdial.conf
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = AT+CGDCONT=1,"IP","imis"
Stupid Mode = 1
Modem Type = USB Modem
ISDN = 0
New PPPD = yes
Phone = *99#
Modem = /dev/ttyACM0
Username = a
Password = b
Baud = 460800
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Jun 28, 2011
i have 2 laptops dell d410 whit slackware 13.7 on them .i had some problems with one (one pad) and i have changed some components from one laptop to another : some ram ,wireless, internal modem .now i don't have internet connection from slackware . if i boot slax it's all ok.
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Jun 7, 2011
I'm going to an area with no wired internet connection so I would gather information on if it is possible and how to make working the following configuration for an home network:
a wireless access point connected to a laptop (an old one with a centrino Duo) with a usb stick for UMTS connection to the internet it is possible to use the laptop for routing to the internet the requests (http, ftp, mail etc..) of the PC connected to the home LAN which software have I to install on the laptop?
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Apr 20, 2010
Is there any way to setup the Centos Directory Server without an internet connection?? i tried using the command: yum install centos-ds
but this just tries to connect to the internet to to download the packages. Is there a site where i can find the package so that i can copy it to my server and install it or is there some other way to do this?
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Apr 30, 2011
I've just upgraded to Ubuntu 11.04. Everything worked fine, until I rebooted. Now I can not connect to my home wireless internet, so I can't re-enable third party software sources. I am currently using a different computer, so I know that our internet works. I checked the wireless switch on my laptop, and it says that wireless is enabled. I've rebooted, and it still doesn't work. I tried our wired internet, and that didn't work either (although I'm not sure if our wired internet works; we haven't used it in a few years)
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Jan 24, 2010
Its a case of ".... wireless network connection active but still not internet connection .."I am using WEP - 128 key ... Works when I connect directly using ethernet cable ... but not wireless (pci and wireless router)
ubuadmin@ubucomputer:~$ ifconfig
wlan0 Link encap:Ethernet HWaddr 00:06:25:12:83:3b
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::206:25ff:fe12:833b/64 Scope:Link[code].....
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Jun 21, 2009
I have installed Fedora 11 recently. I want to share my Internet connection.
I have e LAN connection eth0 which is connected to internet.
I have a Wireless connection wlan0.
I want to share my internet connection with wireless connection.
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Jan 30, 2010
I have a CentOS server in one of my labs at work that does not have an Internet connection.Is there anyway that I can download the updates on a USB stick and then update the server? If so, what are the procedures?
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Sep 23, 2010
I'm looking for a bootable (livecd) cd that will perform an antivirus scan on a computer without needing an internet connection. It should have its latest virus signatures included so I can simply download and burn it. I've seen [URL].. suggested in various questions asked here, but that post is from 2008.
I tried:
Bitdefender rescue cd
Trinity rescue kit (TRK)
Panda SafeCD
[Code]...
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Feb 5, 2010
At home I'm currently running Hardy on a desktop machine and Jaunty (Eeebuntu) on an EeePC. I often connect the desktop to the internet via a cellphone as modem. I also often connect the EeePC to the desktop via crossover cable and SSH into the desktop so I cam watch video files from the desktop on the EeePC from the sofa or bed.
I'd like to be able to use the desktop's internet connection from the EeePC. This means I have to set up the desktop so the EeePC can share its connection - this involves setting up the desktop as a gateway I believe?
Looking around for info on how to do this, I found this guide [URL]...in-ubuntu.html - but unfortunately it seems this guide has not been written correctly. It repeats itself in one section (below: repeated section in bold):
[Code]...
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Oct 21, 2010
I tried to install Xubuntu 10.10 Maverick as dual boot on my laptop. However when xubuntu is on, I can't find a way to connect to internet. When I try the 2 arrows on the up-right corner the option for wireless is deemed. I tried offline/online, that did not work either. when I click the firefox It says you are not connected.
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May 1, 2011
I seem to have is trying to get the internet to work. I can go to ..... ect but when I try to run playonlinux it says you do not seem to be connected to the internet, please post if you have anything useful, as I said I am very new to linux so be as detailed as possible.
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