Bridge with netctl - ArchWiki

# Bridge with netctl

Related articles

- Network bridge
- netctl
- ODROID#Network_bridge

This article or section is a candidate for merging with Network bridge.

Notes: I suggest to move the netctl-specific parts of this article into a subsection of "Network bridge" (Discuss in Talk:Bridge with netctl#)

Make sure netctl is installed.

Copy `/etc/netctl/examples/bridge` to `/etc/netctl/bridge`.

In this example, we create a bridge called `br0` which has real Ethernet adapter `eth0` and (optionally) a tap device `tap0` connected to it. Of course, edit `br0`, `eth0` and `tap0` to your needs.

    /etc/netctl/bridge

    Description="Example Bridge connection"
    Interface=br0
    Connection=bridge
    BindsToInterfaces=(eth0 tap0)
    IP=dhcp

This example creates a statically assigned bridge called `br0` which has real Ethernet adapter `eth0` connected to it. Edit `Interface`, `BindsToInterfaces`, `Address`, and `Gateway` to your needs.

     /etc/netctl/bridge

    Description="Example Bridge connection"
    Interface=br0
    Connection=bridge
    BindsToInterfaces=(eth0)
    IP=static
    Address='192.168.10.20/24'
    Gateway='192.168.10.200'
    ## Ignore (R)STP and immediately activate the bridge
    SkipForwardingDelay=yes

Tip: If you are using static IP, see man pages of netctl, and also edit `/etc/resolv.conf` if necessary.

This example ensures that the bridge gets assigned the MAC address of the ethernet device (reference https://github.com/joukewitteveen/netctl/issues/111 )

    /etc/netctl/bridge

    Description="Bridge eth0-tap0"
    Interface=br0
    Connection=bridge
    BindsToInterfaces=(eth0 tap0)
    IP=no
    ExecUpPost="ip link set dev br0 address $(cat /sys/class/net/eth0/address); IP=dhcp; ip_set"
    ExecDownPre="IP=dhcp"

    ## Ignore (R)STP and immediately activate the bridge
    SkipForwardingDelay=yes

You can bridge any combination of network devices editing `BindsToInterfaces` option.

If any of the bridged devices (e.g. `eth0`, `tap0`) had dhcpcd enabled, stop and disable the `dhcpcd@eth0.service` daemon. Or set `IP=no` to the netctl profiles.

Finally, start and enable[broken link: invalid section] your `/etc/netctl/bridge`.

Category:

- Networking

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