Re: network bonding on Debian/Trixie

[Darac Marjal]

On 16/10/2023 21:59, Gary Dale wrote:

I'm trying to configure network bonding on an AMD64 system running Debian/Trixie. I've got a wired connection and a wifi connection, both of which work individually. I'd like them to work together to improve the throughput but for now I'm just trying to get the bond to work. However when I configure them, the wifi interface always shows down.

# ip addr

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever

    link/ether 3c:7c:3f:ef:15:47 brd ff:ff:ff:ff:ff:ff

    link/ether c4:41:1e:31:9a:d5 brd ff:ff:ff:ff:ff:ff

    link/ether 3c:7c:3f:ef:15:47 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.20/24 brd 192.168.1.255 scope global bond0
       valid_lft forever preferred_lft forever
    inet6 fe80::3e7c:3fff:feef:1547/64 scope link proto kernel_ll
       valid_lft forever preferred_lft forever



Here's the /etc/network/interfaces file:

auto lo
iface lo inet loopback

auto enp10s0
iface enp10s0 inet manual
    bond-master bond0
    bond-mode 1

auto wlxc4411e319ad5
iface wlxc4411e319ad5 inet manual
    bond-master bond0
    bond-mode 1

auto bond0
iface bond0 inet static
    address 192.168.1.20
    netmask 255.255.255.0
    network 192.168.1.0
    gateway 192.168.1.1
    bond-slaves enp10s0 wlxc4411e319ad5
    bond-mode 1
    bond-miimon 100
    bond-downdelay 200
    bond-updelay 200




Any ideas on how to get the wifi to work in bonding?

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 2: enp10s0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP group default qlen 1000 4: wlxc4411e319ad5: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 7: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 It does this even if I pull the cable from the wired connection. The wifi never comes up. I'd like to get it to work in a faster mode but for now the backup at least allows the networking to start without the wifi. Other modes seem to disable networking until both interfaces come up, which is not a good design decision IMHO. At least with mode 1, the network starts.

I use systemd-networkd to configure bonding in the same way. I use the "active-backup" mode and one parameter that I don't *think* you've set is the "primary".  According to https://www.kernel.org/doc/Documentation/networking/bonding.txt, you'd set "primary" to the interface which is always active if it's available. So you probably want to set "bond-primary enp10s0" so that the system will switch to the cable when it's connected; when the cable disconnects it should switch over to the wifi. Without "primary" being set, I suspect the system doesn't have any motivation to prefer the cable when both are connected.

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