CentOS 5 Networking :: DNS Change During Network Installation?
Sep 21, 2010
I have been installing CentOS 5.5 on a VirtualBox virtual machine using the netinstall iso (leaving almost all options on default).It automatically obtained addresses of the nameserver the host machine was using. However shortly before the installation would have finished the nameserver went down and the installer started giving error "file ... cannot be opened".
After changing the nameserver address (to Google DNS 8.8.8.8) in /etc/resolv.conf , addresses can be resolved again (wget, ping) but the installer still gives the same error and attempts to connect to the original DNS.It there a way to tell the installer about the DNS change and resume installation? Or do I have to either wait for the original DNS or to do the whole installation again?
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Jan 21, 2011
I had installed a Centos 5 server, with one network interface card and work find. Now I want to install ADSL (PPPOE) dial-up for internet in this server, so need to add a 2nd network interface card (RTL8139D or other) . After plug the network card, what I need to do in Centos to find this new card and config it?
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Jul 23, 2011
Does a network install assign a pingable ip during installation? I am trying to verify why I get an error during installation that "stage2.img" cannot be found and I'm guessing that since I can *not* ping the static IP I assigned, that the network functionality is not working during the install process. Can anyone confirm if I should be able to ping a system during installation using the assigned static IP?
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Sep 3, 2011
We are using vmware server 1.0.10, centOS distribution 2.6.18-238.12.1.el5PAE.
We started the vmware service successfully, however, while we do ifconfig, we did not see vmnet1, and we do ifconfig vmnet1 up, we see that vmnet1:no such interface.
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Oct 5, 2010
I have a server that is on both a standard network and a virtual network, as follows: server1 attached to standard network server1 acting as Dom0 with two linux DomU guests (under Xen) I only have one network card. How do I configure server1 to have a different hostname on the standard network than on the virtual network? Here are the relevant network configuration files for server1:
/etc/sysconfig/network-scripts/ifcfg-eth0:1
DEVICE=eth0:1
BOOTPROTO=none
NETMASK=255.255.255.0
IPADDR=192.168.122.9
[Code]...
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Aug 12, 2009
I am attempting to setup a network to network VPN tunnel between our main office and a temporary location. This location need full VPN access back to the main office's network.Anyhow we have spent about 3 solid days attempting to make this work without any great success. Here is our network scheme for these two devices.
Network A (Main Office) (OpenBSD using isakmpd)
Network: 172.16.8.0/24
External IP: 1.1.1.1 (obviously not the real IP)[code].....
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May 12, 2009
I have installed CentOS 5.3, and updated with yum update. I have kernel 2.6.18-128.1.10.el5xen.
I can't get my wirelss network to work, I have AR928X wireles network adapter.
Do I need to install a newer kernel and install ath9k or can I just downlad a driver without updating the kernel?
I'm new to CetOS and Linux so I hope someone kan give me a step by step guide to what I can do!
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Aug 25, 2010
I just upgraded from Ubuntu 9.04 64-bit, to CentOS 5.5 64-bit and my RT-73 USB network card doesn't seem to want to function. It always worked fine in Ubuntu by default (plug and play). Is there some setting I need to make to get this working?Even BT-3 (which is quite old) recognizes the RT-73.
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Mar 2, 2011
I need to change DNS server that I'm using from a provider to another.Let's just say I'm using a local DNS, and wanted to use Google's DNS.I'm using CentOS, so a friend of mine told me to directly change file:/etc/resolv.confand I already did it.My question is: Do I need to restart my network after changing this file?How do I know that I'm already using the new DNS instead of still connecting using my old DNS?
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Dec 11, 2009
I need to change my lan card orderI have 3 lan cards eth0, eth1, eth2and I need my current eth2 as my primary lan card
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Dec 11, 2009
I found problem in FC 12 release. I installed fc 12 to server (earlier there was FC 7). Then as always i realised that names of interfaces (eth0, eth1, eth2 .... eth9) changed after install. eth0 became eth9, eth1 became eth5 ... Earlier on previous fedora releases i solved this problem correcting HWADDR in ifcfg-eth files, so i linked MAC addresses to names (eth0, eth1, eth2) as i wanted in a right order. Now I can't do this. After correcting these files and restarting network sevice i constantly get a message: device ... has different mac than expected. I looked ifup-eth file and compare it with the same one in fedora 7. And i found that in fedora 7 there is function rename_device which processes if HWADDR value doen't coincide with real mac address value. See code:
# remap, if the device is bound with a MAC address and not the right device num
# bail out, if the MAC does not fit
if [ -n "${HWADDR}" ]; then
FOUNDMACADDR=`get_hwaddr ${REALDEVICE}`
if [ "${FOUNDMACADDR}" != "${HWADDR}" ]; then
curdev=`get_device_by_hwaddr ${HWADDR}`
if [ -n "$curdev" ]; then
rename_device "${REALDEVICE}" "${HWADDR}" "${curdev}" || {
echo $"Device ${DEVICE} has different MAC address than expected, ignoring."
[Code].....
But in fc 12 release there is no function rename_device!!!!!!!!! So in this case if HWADDR value is not the same as FOUNDMACADDR value (which equal to REALDEVICE mac address) i just get an error message So I can't change interfaces names, as result i can't organize right order of network interfaces as it was earlier on fc7.
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Mar 27, 2009
I think i've discoverd an issue on our linux servers. We have developed an in house application that send and recieves a large volume of udp data. I'm see alot of errors for udp when I run a "netstat -us". Could the recieve buffer be too small and if so, how do it change it. What is the default size on centos 5?
kernal = 2.6.18-53.1.14.el5PAE #1 SMP Wed Mar 5 12:07:47 EST 2008 i686 i686 i386 GNU/Linux
"netstat -us" output
Udp:
197961014 packets received
1474 packets to unknown port received.
49340800 packet receive errors
25890918 packets sent
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May 7, 2009
Centos 5.3 How can I change the primary nic from eth1 to eth0? My board has 2 nic's and I'm having license issues with cpanel
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Sep 28, 2010
In gnome-network-properties I've set up two proxy locations: default and remote.
It's a bit of a fag having to change between them via the gui depending on where I am. Can the proxy be changed by command line because then I can set up a script to use the right proxy automatically? - e.g. use remote proxy if my mobile is connected via usb.
Had a google but don't think gnome-network-properties has command line options so I might be approaching this from the wrong tack.
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Mar 14, 2010
I run an Ubuntu Server in a Virtualbox environment. Setup works fine. In virtualbox, I accidentally hit a button that generates and assigns a new mac address for the network adapter. Since then the machine does not bring eth0 up. I tried the following ifconfig eth0 down; ifconfig eth0 hw ether macaddress; ifconfig eth0 up. Then restarted networking.
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May 11, 2010
Is it possible to have different /etc/hosts file for different network connections without having to go in and change it every time? The why: I have dyndns and port forwarding to get to my desktop. My laptop is sometimes on the same network, and sometimes not. Also, sometimes the dyndns doesn't update properly, or the outside connection is down, but I want to get to my desktop (and I'm too lazy to walk up the stairs). I'd like to be able to keep one set of bookmarks, ssh command aliases, etc. that would always get to it the fastest and most reliable way possible.
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Jul 5, 2010
I have 1 router 2 pcs. We had to move one pc away from the router so I bought a wifi card. Everything went fine, the card works and I have internet but the network is incredible slow.
I am using Ubuntu Lucid Lynx 10.04
lspci | grep Wire
Code:
Code:
Then:
Code:
But there are no changes.
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Jan 21, 2011
I have a script that I would like to run when my laptops connects to a new network (e.g. changes to another SSID). I've done some searching on the net but could not find any suitable solution (but I bet there is).
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Apr 4, 2011
I would like to change wireless mode on my network card. When i type in iwconfig in terminal so i get abg I would like to have only a mode active. How do i do?
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Jul 26, 2011
I am using centOS 5.0. After I change from DHCP to static IP address, I cannot ping hosts on the same subnet. The error message says destination host unreachable. Before I made the changes I was able to ping and now even I change it back to DHCP I still cannot ping with the same destination host unreachable message. The centOS is running on VMware on a Windows host.
ifconfig shows
eth0 Link encap:Ethernet HWaddr 00:0C29:A1:9A:10
inet addr: 192.168.0.202 Bcast:192.168.0.255 Mask: 255.255.255.0
inet6 addr ......
After pinging 192.168.0.106 (106 is on and other host can ping it), arp -a shows ? (192.168.0.106) at <incomplete> on eth0 I tried different ways by disabling the firewall and and disabling SE protection. No Luck.
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Dec 14, 2010
I am looking for a way via script to change a systems hostname and IP address!
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Sep 2, 2010
I have a second network card in my ubuntu desktop that I have sharing my internet connection with a wireless router. I have set the router to a static ip address within the network cards range. But, every time I restart the computer, the network card uses a different ip address. One time it will be 10.42.43.1, the next time it will be 10.42.46.1, ect. This makes me have to hard reset my router every time it does this. How can I set the network card to use the same ip address all the time?
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Sep 26, 2010
I've got two network card interfaces on my computer, one wireless and one wired. The wireless card is connected to the Internet and the wired is connected to the LAN. When only the wireless card is active, Internet works. As soon as i enable the second wired card, Internet stops working. And it seems like Ubuntu chooses the wired card for Internet as soon as it's enabled.
Are there any ways to solve this? So my Ubuntu box always chooses the wireless card for Internet traffic and let me use the wired device for LAN only?
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Oct 21, 2010
I've been struggeling with this for a few hours now, googleing and so on trying to find an easy way to just switch which device I want as primary for internet connections. After long battles I'm at a loss, this is the current automatic routing
Code:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
85.225.76.0 0.0.0.0 255.255.252.0 U 1 0 0 eth0
85.225.76.0 0.0.0.0 255.255.252.0 U 2 0 0 wlan0
[Code]...
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May 17, 2010
I'm using virtual network (NAT network) for my domU.When I change dom0's firewall setup, the domU will fail to connect to Internet anymore.So far, the only way to bring the network back is reboot dom0 !I try to restart service network and libvirtd on dom0 ... it doesn't work.How can I bring the domU network back without reboot dom0 ?
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Apr 16, 2010
I'm a Linux n00b (very fluent in Windows, though ) that is attempting to set up a (currently) 3-computer cluster. My server node is a Pentium 4, and my client nodes are a Pentium 4 and a Pentium 3 (whatever I have lying around ) I chose to use OSCAR for my clustering interface and CentOS 5 for my server node OS. Yay. I made it through the installation prerequisites, but when it came to configure the NIC, I got stuck.
I opened the /etc/hosts file, tinkered with it, but something inevitably got screwed up. I can still use the Internet, but it won't let me install OSCAR. Running a system-sanity check returns:
Code:
[root@SurgeonfishR ~]# system-sanity
Checking your system...
Success: ssh-check.pl
Success: tftpboot-check.pl
Success: selinux-check.pl
[Code]...
All I need to know is what the /etc/hosts file should look like for a CentOS 5.4 installation with 1 NIC that is not connected to a domain (only a LAN). It is connected to a router which in turn is connected to my home network (I don't know what to do about that). The hostname should be surgeonfishr and the IP address should be 192.168.0.150.
I know this question is probably really stupid, but I've logged a total of about 10 hours time on Linux...ever. (And 35000 hours on Windows.)
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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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Feb 13, 2009
Can anyone please tell me the files that a network card needs to use - know it needs a file called ifcfg-eth0 in etc/sysconfig/network-scripts
What other files has information relating to eth0
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May 6, 2009
Right now I have this error
On my top right hand corner. No network devices available.
My distro is Centos 5.3
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Sep 5, 2009
So I just did a fresh install of CentOS 5.3 and ran an initial update how ever I cannot get the network manager to start. I found this page on the wiki - [URL]? highlight=(networkmanager) But when I try to run chkconfig NetworkManager on
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