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# service network restart Shutting down interface eth0: [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining if ip address 192.168.1.99 is already in use for device eth0 If the configuration is on a routed network, the compute node must have a static, DHCPv6, or stateless IP address assigned to it. Static addresses can be IPv4 or IPv6. If you use IPv4 and IPv6 for the management node Eth0 (management network interface), each managed chassis and chassis component must have an IPv4 address. # ifconfig eth0. eth0 Link encap:Ethernet HWaddr 00:0C:0D:08:C4:32 Where eth0 is the sample network interface name. The output displays 00:0C:0D:08:C4:32 as the interface's MAC address. Navigate to the config file in the /etc/sysconfig/network directory: # cd /etc/sysconfig/network. Open the config file in an editor. One of the most common interface files is ifcfg-eth0, which controls the first Ethernet network interface card or NIC in the system. In a system with multiple NICs, there are multiple ifcfg-eth files (where is a unique number corresponding to a specific interface). The system being used as the gateway server will require at least two networking devices if the internal (private) network is going to be separated from the Internet, this will maintain a level of security for the private network. The external device may be another network card, broadband DSL/Cable modem, or another capable device.

When you install the OS, the anaconda installer provides a "connect automatically" checkbox in the network device configuration screen. You most likely missed it and as a result it does not set the "ONBOOT=yes" parameter in the ifcfg-eth0 network script, which won't "UP" the device after a system restart.

There are two commands to enable and disable an interface, manually. Up to Debian 8, use “ifconfig eth0 up” or “ifup eth0” to enable the interface. From Debian 9, use “ifup eth0”, only. The counterparts are “ifconfig eth0 down” and “ifdown eth0”. The image below shows the default output when enabling an interface. Jun 30, 2019 · sudo mii-tool -r eth0 This also "unblocks" the network card and makes dhcpcd get a new IP. To reproduce Seems like not everyone is able to reproduce this bug. Maybe it's even some kind of "hardware problem". But on affected Raspberry Pi 4 board, everything you have to do is to reboot. Result will be non-functional network. Expected behaviour Jul 18, 2015 · mapping eth0 # Tell ifupdown to use guessnet to determine which network we can use script guessnet-ifupdown # Default location map default: missing-cable # How verbose we are map verbose: false map debug: false # Our different networks, order decides which network is picked # if two or more networks are available at the same time. # service network restart Shutting down interface eth0: [ OK ] Shutting down loopback interface: [ OK ] Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining if ip address 192.168.1.99 is already in use for device eth0

When you install the OS, the anaconda installer provides a "connect automatically" checkbox in the network device configuration screen. You most likely missed it and as a result it does not set the "ONBOOT=yes" parameter in the ifcfg-eth0 network script, which won't "UP" the device after a system restart.

Feb 14, 2016 · May I inquire, why do you have to have name "eth0"? Are you using service network, NetworkManager.service or both? A tool related to former is ip and the latter offers nmcli. I've been waiting almost the whole millenia for ifconfig getting completely deprecated.