On Sunday 12 October 2025 at 17:57:45, Didier Kryn wrote:

>      Really a lot of things can be done by ifup, including bonding
> interfaces or launching wpa_supplicant

Indeed. Here is an example from a machine I host virtual servers on:

-----
auto eth0
iface eth0 inet dhcp

auto br0
iface br0 inet manual
        bridge_ports eth1
        bridge_waitport 0
        bridge_stp off
        bridge_fd 0
        up brctl addbr br1
        up ifconfig br1 up
-----

eth0 is simple and commonplace.

br0 is a bridge interface used by virtual machines to be able to talk to other
things on the outside world, through my physical interface eth1, which itself
does not have an IP address.

br1 is another bridge interface used by virtual machines, but it does not
bridge to any physical interface on the machine - it's purely an internal
communications bridge for virtual machines to be able to talk to each other (a
virtual network switch, in effect).


Antony.

--
You can tell that the day just isn't going right when you find yourself using
the telephone before the toilet.

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