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Questions tagged [ifconfig]

ifconfig is a system administration utility in Unix-like operating systems to configure, control, and query TCP/IP network interface parameters from a command line interface (CLI) or in system configuration scripts.

ifconfig (short for interface configuration) is a system administration utility in Unix-like operating systems to configure, control, and query TCP/IP network interface parameters from a command line interface (CLI) or in system configuration scripts. Ifconfig originally appeared in 4.2BSD as part of the BSD TCP/IP suite.

Source: Wikipedia.

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VIP (using corosync + pacemaker) not accepting traffic until ifdown / ifup is called

I'm running Corosync + Pacemaker on Ubuntu 14.4. I set up two nodes with two VIPs, and when I bring pacemaker down in one node, the VIPs do go to the other, but no traffic actually goes through the system until I manually run ifdown eth1 and ifup…
moomima
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Debian up in /etc/network/interfaces not working

I'm trying to add a secondary IPv6 address to eth0 on Debian Sid. I added the following lines to /etc/network/interfaces: iface eth0 inet6 static address [IPv6 address #1] netmask 64 gateway [IPv6 gateway] pre-up echo 0 >…
Louis Matthijssen
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Kickstart: ifcfg-eth0 file genorated by kickstart when install from network but from initrd when install form USB

When I install Fedora 19 with a kickstart file and via network, the generated ifcfg-eth0 file is genorated by the kickstart: # Generated by parse-kickstart However if I use the same kickstart file and install via a USB stick, the ifcfg file is…
dooffas
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how to configure static ipv6 and additional ipv6 with same vlan?

I'm having trouble with configuration static ipv6 address and additonal ipv6 on same interface(eth4). static ipv6 configuraiton issue firstly, I configure below vi /etc/network/interfaces auto eth4 iface eth4 inet6 static address 0.0.0.0 network…
joseph-shin
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Sub-interface already in use on another host - brand new interface

I created a sub-interface on a RHEL box, eth0:1, and copied the eth0 config and changed all the settings to reflect eth0:1 and the IP address. However, when I issue ifup eth0:1 I receive this error: [root@server-1 ~]# ifup eth0:1 Error, some other…
FilBot3
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IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready & IPv6: ADDRCONF(NETDEV_UP): xenbr2: link is not ready on Ubuntu Server - Xen bridge

Hi all, I am having some problems getting a Xen bridge up in Ubuntu precise with Xen. I created a first bridge on eth1 with no problems, but the exact same process for eth2 yields the following problems: /etc/network/interfaces auto xenbr1 iface…
user2284355
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Virtual interface gets static IP, actual interface doesn't?

I have a server running Debian 6 with two static IP addresses assigned: eth0 and eth0:1 (virtual interface of eth0). On boot, both should get their assigned IPs...but eth0 does not. /etc/network/interfaces: iface eth0 inet static address…
Nathan C
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Get ip address and set as variable bash shell script

I am trying to write a bash script to configure an app (unattended install). All I need to do is this. I need to get the IP address for the server and set it as a variable. I am writing this script to simplify that. What I have noticed is that when…
John Stapleton
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how to stop eth0 bridged connection via eth1 host only connection in a virtual machines?

I have to simulate unplugged network cable for testing issue to all applications we are developing in my company . I have about 6 virtual machines Cent-OS on a virtual box . from a php web page , I have to choose a server and stop its network and…
Nancy Smith
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Creating a bridge on EC2 causes connectivity loss

I'd like to create a bridge in my EC2 instance and to associate an IP address to it. Given the default /etc/network/interfaces file: auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp I simply add to the end of it: auto br0 iface br0…
Roberto Aloi
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why does interface show on ifconfig

I bought up a vlan interface by running ifup on my ifcfg-vlan10 file, now when I do ifdown the ip connection goes down, however the device vlan10 is still visible in ifconfig. Why is that the case and how do I get rid of it from ifconfig?
Dan
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Peer to peer ipsec tunnel - virtual network interface

I'm trying to create an IPSEC tunnel between two machines (not between two networks). Using ipsec-tools, TUNNEL mode. I think I can cope with all those add and spdadd, but how to create a virtual network interface for the IPSEC tunnel ? I want some…
Sandman4
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How to configure second non-consecutive subnet on same interface?

I have some servers on the public network of my isp, say 192.168.2.0/24. Now my provider gives me additional ip addresses, but unfortunately not in a subsequent range of my first network, say 192.168.4.0/24. I configure the new servers with the new…
anselm
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Ubuntu second static IP, ifconfig, /etc/network/interfaces

I would like to add a second static IP to my local Ubuntu 11.10 desktop machine and have it automatically available after rebooting. So far I am successfully using ifconfig to to temporarily set up an alias for my primary network interface: #…
Schmoove
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How to execute a script only once, immediately after ALL network interfaces are up in OpenSUSE?

I run Opensuse 12.2. I have 3 network interfaces, eth[012] The interfaces are configured in /etc/sysconfig/network/ifcfg-eth[012] I want to execute a script immediately after ALL three interfaces are 'up'. Adding…
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