Red Hat :: Network Interface Configuration File Rewritten
Feb 20, 2011
This past Friday as I was performing regular maintenance on my RHEL / CentOS servers, I ran yum upgrades on them and when they rebooted, I realized there were network issues and I could not longer access them via Ping or SSH. When I jumped on the console, I realized that it created a new 'ifcfg-eth0' file with none of my static information & the old 'ifcfg-eth0' file with all my static info had been renamed to 'ifcfg-eth0.bak'. It appears that the MAC address on the new file and the old .bak file are different and I have no idea why. I have no changed or altered anything on the server.
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Oct 31, 2010
For Ubuntu 10.04, I can configure the network by "Network Connections". This configuration is done by doing the following operation sequences(System->Preferences->Network Connections->wired->auto eth0). Then I can connect to and browse the internet. If I type the command "ifconfig", I can see the ip I configured for eth0. Part of the content is as blow:
[Code]...
I think there should be other files that keep the eth0 configuration content. What are they?
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Jul 18, 2011
I have a ppp0 entry with post-up options like this
mapping ppp0
map none photon-plus motorola
map timeout: 12
[code]...
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Apr 20, 2010
I have a little problem with my Linux Suse 11.2 Server. I have unused network card with one port, and one with 4 ports and two used ports.
so->
eth1 is connected to a dsl-modem
eth2 is connected to a switch
i want my suse server to route between modem and switch.
Somehow, I can't go in the internet via eth1. I have to create a bridge br0 to go in the internet. very strange, when i delete the bridge and set eth1 as primary device, i have no internet.
How can i route from eth2 (10.x.x.x) to (eth1 or br0 (80.109.145.x) to Modem (80.109.145.1)?
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Jan 29, 2011
Suppose I have both a hardwired and a wireless network connection active on the same system at the same time. Can I tell my browser which one to use? Can I tell other programs which one to use? Or do they choose for themselves> Or does some automatic system protocol select which one to use for them?
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Mar 15, 2016
Is this a problem of systemd or network-manager however when I started to see this alert I noticed the nm-applet doesn't start automatically anymore.
Code: Select allsystemctl status network
networking.service network-online.target network.target
network-manager.service network-pre.target
zagor@Debian-635:~$ systemctl status networking.service
● networking.service - Raise network interfaces
Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor prese
[Code] ....
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Jul 27, 2011
I have a ppp0 entry with post-up options like this
mapping ppp0
map none photon-plus motorola
map timeout: 12
## map init-time: 12 # for slow drivers
[code]...
If I comment those off then no such problem, hence some how ppp0 executed automatically and there is no [auto ppp0] any where. How can I stop this forcefully ?
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Dec 10, 2009
I have b43 wireless. In network Configuration on system->administration the interface it appears as inactive it appers in hardware also as b43 associated to wlan0 but i cannot have access to any wireless network. What i have to do to put this b43 to work.
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Mar 31, 2011
I used the network manager to configure my eth0 interface.It is working fine. I have found the nameserver entries in /etc/resolv.conf files. But the /etc/network/interfaces file does not carry the ip, netmask, gateway,network and broadcast entries. It only has a entry for the lo interface. where are the settings for eth0 as done by the network manager, stored in case of ubuntu?
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Jul 19, 2011
I'm having difficulty setting up my desired network infrastructure. Here's the situation:
I'm currently using an Ubuntu box as homeserver to do everything from sharing internet (via NAT), over DHCP & DNS to filesharing and even virtualisation.
However, since my machine is capable of virtualising Astaro Security Gateway properly, I would like to transfer and split up responsibilities.
I want to have my Astaro fully responsible for the internet and act as the gateway, and along with that disconnect my physical box from the internet and put it behind Astaro (basically making it just a member of the internal network).
The difficulty I'm having with this is that Astaro is running virtually on the physical box, and I can't seem to figure out how to configure the external interface. It needs to be up for Astaro to be able to use it, but it should not give the physical machine access to the external network.
I'm thinking I could set it to manual and not give it an ip address, but I'm not sure on this.
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Apr 14, 2011
I found multiple sites explaining how to add IPs to a network interface as virtual interface like eth0:0. However I can add IPs to an interface as well using the ip command: ip a a 192.168.2.2/24 dev eth0 What I want to know is how I can make this persistent on rhel/centos.
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Jul 7, 2010
My system was powered down at daylight savings changeover. Like many Linux users, I keep my RTC on local time so that I can still boot XP on the odd occasion. With my older Linux distros, ntpd would correct the system time during the next boot, and the altered system time would be copied to the RTC on shutdown (by hwclock). This no longer seems to happen. During boot, ntpd corrects the system-time, and the users sees the right time, but the corrected time is never copied to the RTC. The issue only becomes a problem if the system is booted without access to any ntp servers - in which case the system time is visible uncorrected.
I was under the impression that the kernel's 11-minute save-RTC mode should preserved any NTP corrected system-time to the RTC. And failing that, a shutdown triggered hwclock --systohc should have also corrected the RTC. How come neither work for openSUSE (11.2)? Another issue is that having initially booted without an internet connection, ntpd refuses to re-resolve the the ntp servers and has to be manually restarted. Shouldn't ntpd have a roadwarrior option to retry resolving hosts? - this would save having to manually kick it via the command line or cron.
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Dec 1, 2009
my rounter causes puppy to write an improper dns entry in resolv.conf. Consequently I have to manually write it, then I have to place a command on it to make sure it doesn't get rewritten on boot, or after a couple of hours use. I had this problem with xubuntu as well.
[URL]
I solved this problem in ubuntu by using the chattr command.
[URL]
Puppy won't let me do this. When I use the chattr +i /etc/resolv.conf, it gives me this error. chattr: Inappropriate ioctl for device while reading flags on /etc/resolv.conf I tried chmod 444 but it had no effect on reboot. resolv.conf was rewritten again. How can I make sure this file does not get rewritten. Why won't chattr work?
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May 12, 2009
I have just upgraded a CentOS 5.2 box to Centos 5.3
I did have a bridged networking setup for Virtualbox which worked well. eth0 was bridged with br0. br0 boot protocol was DHCP and it sent its DHCP_HOSTNAME to the windows DHCP servers.
since the upgrade the br0 does not get an address but the eth0 does. I found that the scripts in /etc/sysconfig/network-scripts/ifcfg-* are getting rewritten.
I figure I may not need to have a bridge any more so I stripped that out to try to get a simple network setup working. I now just have eth0. I edited /etc/sysconfig/network-scripts/ifcfg-eth0 so that it looked like this,
~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Attansic Technology Corp. L1 Gigabit Ethernet Adapter
DEVICE=eth0
BOOTPROTO=dhcp
[Code].....
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Oct 1, 2010
For Ubuntu 10.04, I can configure the network by "Network Connections". This configuration is done by doing the following operation sequences(System->Preferences->Network Connections->wired->auto eth0). Then I can connet to and browse the internet. If I type the command "ifconfig", I can see the ip I configured for eth0. Part of the content is as blow:
Quote:
ifconfig
eth0
inet addr:192.168.28.31 Bcast:192.168.28.255 Mask:255.255.255.0
But in the "interfaces" file, there is no eth0 content. The whole content is simply as below:
Quote:
cat /etc/network/interfaces
auto lo
iface lo inet loopback
I think there should be other files that keep the eth0 configuration content.
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Apr 28, 2011
When emacs freezes doing a DNS lookup, that makes it rather hard to fix a network configuration file. Why does it need to do that?
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Apr 7, 2011
I am totally new to Linux and have just installed ubuntu 10.10. After configuring the network interface via dhcp I started getting these messages that come in so frequently I can't configure anything else.
[87.186415] Stack:
Why I am getting this messages and more importantly how do I get rid of them.
The installation is on a VM on Hyper-V.
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Aug 30, 2010
today I tried to configure a network route to a host for testing my network interface. Code: route add 192.168.1.15 eth0 As I have to eth interfaces and both interface got their IP from DHCP (192.168.1.11 and 192.168.1.12) and are in the same subnet, I shut the other interface down:
Code: ifconfig eth1 down Then I tried to test the interface by doing a ping to 192.168.1.15.
Problem: When I unplug the cable from eth0 (and eth1 is still plugged) the ping still works. Somehow my linux (it's debian) powers up again eth0 and pings over this port.
How can I stop my linux doing this. I just want to have the route added only on the one interface - not the other. Is it maybe some case of a default-gateway?
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Aug 20, 2010
Config: Squeeze, 2.6.32-5-amd64I just installed squeeze and the network is up and nm-manager deamon if working but the Gnome applet doesn't seem to work as usual. It indicates no network although the network is available as indicated by ifconfig and route below. When I switch WiFi on, the nm works flawlessly. When I click on the applet icon it says "Wired Network: device not supported" (or similar, msg in french is
eth0 Link encap:Ethernet HWaddr 00:1f:e2:12:ea:d8
inet adr:192.168.0.182 Bcast:192.168.0.255 Masque:255.255.255.0
adr inet6: fe80::21f:e2ff:fe12:ead8/64 Scope:Lien
[code]...
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Feb 14, 2010
Last night while setting up wired & wireless connection in openSuse 11.2 Gnome version via YAST's ifup, I got wireless but lost wired connection (interface eth0). Dmesg shows that eth0 became eth1. I cannot get eth0 back. Is there any way to remedy this situation, eg. get info from the Ubuntu partition in my triple-boot laptop, without having to re-install openSUSE?
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Mar 1, 2010
I would like to use zypper to update openSUSE 11.2 through the Virtual Terminals (tty1 thro' tty6).
Network Interface is wlan0 (Wireless LAN, home network through a Router) that requires a password using WPA2.
My question is how to start wlan0 through the command-line ?
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Dec 26, 2010
I have a laptop connected to the the net thru an adsl modem, when I switch off the laptop network interface,(thru system-config-network) the light of the laptop network card plugged in the router stays on ( green) where as in my pc, when i do the same thing , the light of my pc network card goes off in the modem
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Aug 14, 2011
i recently started sockets programming. In the process i began to look for relevant network information about my computer and realized that ifconfig wasn't displaying the same information that resides in my /etc/network/interfaces file. On the interfaces file my IP address is 192.168.1.109 for interface eth0 but ifconfig displays 192.168.1.101. I was under the impression that ifconfig got its information from the interfaces file but clearly doesn't. I tried re configuring the device with ifconfig and then disabling and re enabling the device with ifdown and ifup so that the device updated its information but it didn't.
[Code]....
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Dec 27, 2015
I'm renting a server which comes with 5 IP addresses, but only one network device. From what I can understand I'm able to create aliases by adding entries to /etc/networks/interfaces, I haven't tried I'm in the planning stages. Hypothetically, 192.168.22.30 is my primary IP and I want to set eth0:1 to have 192.168.22.31, and then after that I want to create a virtual machine (using kvm/qemu) that is able to communicate bidirectionally to the internet over eth0:1, and leave eth0 strictly for administrating (not for VM traffic).
The qemu guides I'm finding seem to assume that I want to use TAP or VDE, what I want to use is a sub-ip/alias. One guide I saw had me eliminate everything from eth0 and put it under br0. That would leave me unable to ssh into my server (and unable to administrate). Is there a way I can do something along the lines of: qemu [options] -net [option] -netdev=eth0:1 ?
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Jan 31, 2016
Is is possible, via iptables or something similar, to bind a service running on a specific port to a specific interface? My case: I use a VPN service for privacy. I would like to have all traffic except ftp and ssh to run over tun0. Ports 21 and 22 will need to be accessible to the outside world (eth0) while the VPN is running.
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Apr 3, 2010
I'm facing a strange networking problem here. I'm running Debian Lenny in an OpenVZ container and my network setup is as follows:
link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
[code]...
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Jun 17, 2011
I have a webserver with 3 virtual interfaces named eth0:1 eth0:3 and eth0:3. Until yesterday all the virtual ip's worked but eth0:1 decided that it just won't work anymore since yesterday. The configs are:
eth0
Code:
DEVICE=eth0
USERCTL=no
ONBOOT=yes
BOOTPROTO=none
BROADCAST=xx.xxx.26.190
NETWORK=xx.xxx.26.160
NETMASK=255.255.255.224
IPADDR=xx.xxx.26.174
GATEWAY=xx.xxx.26.161
eth0:1
Code:
MTU=""
NETMASK=255.255.255.224
ONPARENT=yes
BROADCAST=xx.xxx.26.191
BOOTPROTO=none
NAME=""
IPADDR=xx.xxx.26.175
NETWORK=xx.xxx.26.160
ONBOOT=yes
DEVICE=eth0:1
eth0:3
Code:
MTU=""
NETMASK=255.255.255.224
ONPARENT=yes
BROADCAST=xx.xxx.26.191
BOOTPROTO=none
NAME=""
IPADDR=xx.xxx.26.182
NETWORK=xx.xxx.26.160
ONBOOT=yes
DEVICE=eth0:3
eth0:4
Code:
MTU=""
NETMASK=255.255.255.224
ONPARENT=yes
BROADCAST=xx.xxx.26.191
BOOTPROTO=none
NAME=""
IPADDR=xx.xxx.26.187
NETWORK=xx.xxx.26.160
ONBOOT=yes
DEVICE=eth0:4
route-eth0
Code:
ADDRESS0=0.0.0.0
NETMASK0=0.0.0.0
GATEWAY0=xx.xxx.26.161
eth0:3 and eth0:4 still work, but 2 doesn't
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Apr 18, 2010
After updating and subsequently restarting today, I can no longer bring up my wireless interface:
ifup wlan0
SIOCSIFFLAGS: Unknown error 132
Could not set interface 'wlan0' UP
SIOCSIFFLAGS: Unknown error 132
SIOCSIFFLAGS: Unknown error 132
Failed to bring up wlan0
iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0IEEE 802.11abg ESSID: off/any
Mode: Managed Access Point: Not-AssociatedTx-Power=off
Retry long limit:7RTS thr: offFragment thr:off
Encryption key:off
Power Management:off
lsmod | grep iwl
iwl3945 77904 0
iwlcore127432 1 iwl3945
mac80211 180929 2 iwl3945, iwlcore
cfg80211 142905 3 iwl3945, iwlcore, mac80211
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Mar 30, 2011
I am trying to manually configure my wireless interface similar to how I manually configure my wired interfaces on Ubuntu 10.10 (Maverick Meerkat). I have two wired interfaces that use static IP addresses. I set up these interfaces using /etc/network/interface file. I disabled network manager (it was never working correctly to start with). Now, I want to connect my wireless interface (wlan0) to an unsecured wireless private network. I know/can find out all the information about the wireless network (ssid, etc). Also, I need to do this without disconnecting either of my wired interfaces.
I have looked all over the internet/forums for information about how to set up this interface, but nothing I found meets my need. Is there any way I can use iwconfig or the interface file to connect to this wireless connection? Or is there any other tool that will allow me to manually do this?
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Jul 1, 2011
I'm using CFEngine 2.2.8 to configure a network of Debian servers, the servers have two interfaces eth0 and eth1, how can I configure cfagent to take as the default interface eth1? eth0 is the internal interface and eht1 is the one with the public IP, I need to define classes based on lists of public IPs and it would be really helpfull if I could use functions as IPRange that only consider IP in eth0 interface.
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