ifup(8) ifup(8) NAME ifup - bring a network interface up ifdown - take a network interface down SYNOPSIS ifup IFACE ifup -h|--help ifup -V|--version ifdown IFACE ifdown -h|--help ifdown -V|--version DESCRIPTION The ifup and ifdown commands may be used to configure (or, respectively, deconfigure) a network interface based on interface definitions in the file /etc/sysconfig/ifconfig.IFACE. OPTIONS A summary of options is included below. -h, --help Show summary of options. -V, --version Show version information. EXAMPLES ifup eth0 Bring up the interface defined in the file /etc/sysconfig/ifconfig.eth0 ONBOOT=no IFACE=eth0 SERVICE=ipv4-static IP=192.168.1.22 GATEWAY=192.168.1.1 PREFIX=24 BROADCAST=192.168.1.255 ifdown eth0:2 Bring down the interface defined in the file /etc/sysconfig/ifconfig.eth0:2 ONBOOT=no IFACE=eth0:2 SERVICE=dhcpcd DHCP_START="--waitip" DHCP_STOP="-k" # Set PRINTIP="yes" to have the script print the DHCP IP address PRINTIP="yes" # Set PRINTALL="yes" to print the DHCP assigned values for # IP, SM, DG, and 1st NS. PRINTALL="no" ifup br0 Bring up the interface defined in the file /etc/sysconfig/ifconfig.br0 ONBOOT=yes IFACE=br0 SERVICE="bridge ipv4-static" IP=192.168.1.22 GATEWAY=192.168.1.1 PREFIX=24 BROADCAST=192.168.1.255 STP=no # Spanning tree protocol, default no INTERFACE_COMPONENTS=eth0 # Add to IFACE IP_FORWARD=true NOTES The program does not configure network interfaces direct- ly. It runs scripts defined by the SERVICE variable in the network configuration file. The configuration files must have the following environ- ment variables set: IFACE - The interface to configure, e.g. eth0. It must be available in /sys/class/net. SERVICE - The service script to run to bring up the inter- face. Standard services are ipv4-static and ipv4-static-route. Other services such as dhcp or bridge may be installed. This value may be a list of services when the interface is a compound device such as a bridge. ONBOOT - If set to 'yes', the specified interface is configured by the netowrk boot script. GATEWAY - The default IP address to use for routing if the destination IP address is not in a static route or on a local network, e.g., 192.168.1.1. For secondary IP addresses on an interface, this parameter should not be specified. INTERFACE_COMPONENTS - A list of component interfaces only needed for a compound device such as a bridge. This list is normally a single value, e.g. eth0, for use with a virtual host such as kvm. Other paramters that are service specific include: ipv4-static IP - The IP address of the interface, e.g. 192.168.1.2. PREFIX - The number of bits that specify the network number of the interface. The default, if not specified, is 24. BROADCAST - The brodcast address for this interface, e.g 192.168.1.255. If not specified, the broadcast address will be calculated from the IP and PREFIX. ipv4-static-route TYPE - The type of route, typically 'default', 'network', 'or host'. IP - The IP address for a network or host, if the TYPE is not 'default'. PREFIX - The prefix for the associated IP address. GATEWAY - The IP address for a network route. SOURCE - The source IP address to prefer when sending to the destinations covered by the specified route. (optional) dhcp/dhclient DHCP_START - Optional parameters to pass to the dhcp client at startup. DHCP_STOP - Optional paremeters to pass to the dhcp client at shutdown. PRINTIP - Flag to print the dhcp address to stdout PRINTALL - Flag to print all obtained dhcp data to stdout bridge IP_FORWARD - An optional flag to enable the system to forward inbound IP packets received by one interface to another outbound interface. STP - Set bridge spanning tree protocol. Default is no. FILES /etc/sysconfig/ifconfig.* definitions of network interfaces AUTHORS The ifup/ifdown suite was written by Nathan Coulson and Kevin P. Fleming and updated by Bruce Dubbs . SEE ALSO ip(8). IFUP/IFDOWN 8 April 2012 ifup(8)