Contents
Installed Program:
brctl
Installed Libraries:
None
Installed Directories:
None
Introduction to bridge-utils
The bridge-utils package contains a utility needed to create and manage bridge devices. This is useful in setting up networks for a hosted virtual machine (VM).
This package is known to build and work properly using an LFS 12.1 platform.
Package Information
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Download (HTTP): https://www.kernel.org/pub/linux/utils/net/bridge-utils/bridge-utils-1.7.1.tar.xz
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Download MD5 sum: 3e1fee4dc22cac5457c2f6ffb990a518
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Download size: 29 KB
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Estimated disk space required: 1.1 MB
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Estimated build time: less than 0.1 SBU
bridge-utils Dependencies
Optional (to run tests)
Kernel Configuration
Enable the following options in the kernel configuration and recompile the kernel if necessary:
[*] Networking support ---> [NET] Networking options ---> <*/M> 802.1d Ethernet Bridging [BRIDGE]
Installation of bridge-utils
Install bridge-utils by running the following commands:
autoconf && ./configure --prefix=/usr && make
Testing the results requires running the six shell scripts in the
tools/ directory. Two of the tests
require two ethernet ports. Some tests will not preserve the
current network configuration. See tests/README for details.
Now, as the root user:
make install
Configuring bridge-utils
Configuration Information
To automate bridge creation and configuration, install the
/usr/lib/services/bridge service
script included in the blfs-bootscripts-20240209 package.
make install-service-bridge
![[Note]](../images/note.png)
Note
The bridge script depends on the
commands /sbin/ifup and /sbin/ifdown and the service
script ipv4-static from
the LFS bootscripts
dated January 27, 2012 or later.
The following configuration file will create a bridge device at boot time and attach the eth0 device to it. If more than one device is desired, use a space separated list of INTERFACE_COMPONENTS. This configuration is useful when planning to run a virtual machine such as kvm/qemu.
Other SERVICE combinations are
possible, for example, SERVICE="bridge
dhcp". In that case, the address parameters are not
needed, but do not interfere if present. The bridge service may
also be used alone, but will require additional subsequent
configuration.
![[Caution]](../images/caution.png)
Caution
Do not run a parallel configuration for a device in the
INTERFACE_COMPONENTS list. For instance, in the example below,
do not configure /etc/sysconfig/ifconfig.eth0 to run at boot
time. The command ifdown
br0 followed by command ifup eth0 will work, but
don't try to have both up at the same time.
cat > /etc/sysconfig/ifconfig.br0 << "EOF"
ONBOOT=yes
IFACE=br0
VIRTINT=yes
SERVICE="bridge ipv4-static" # Space separated
IP=192.168.1.32
GATEWAY=192.168.1.1
PREFIX=24
BROADCAST=192.168.1.255
CHECK_LINK=no # Don't check before bridge is created
STP=no # Spanning tree protocol, default no
INTERFACE_COMPONENTS="eth0" # Add to IFACE, space separated devices
IP_FORWARD=true
EOF
All addresses should be changed to meet your circumstance.