Going from a one interface setup, to two bonded:

Before:

nano /etc/systemd/network/25-wired.network
[Match] Name=eno1 [Network] Address=172.20.20.2/24 Gateway=172.20.20.1

Create the netdev bond file /etc/systemd/network/25-bond1.netdev.

nano /etc/systemd/network/25-bond1.netdev
[NetDev] Name=bond1 Kind=bond #default is "balance-rr" (round robin) [Bond] #Mode="balance-rr

Create network for bond.

nano /etc/systemd/network/25-bond1.network
[Match] Name=bond1 [Network] Address=172.20.20.2/24 Gateway=172.20.20.1

Select interfaces.

nano /etc/systemd/network/20-eno1.network
[Match] Name=eno1 [Network] Bond=bond1
nano /etc/systemd/network/25-enp5s0.network
[Match] Name=enp5s0 [Network] Bond=bond1

Restart network:

systemctl restart systemd-resolved systemd-networkd

Check if functional:

networkctl

Before:

IDX LINK TYPE OPERATIONAL SETUP 1 lo loopback carrier unmanaged 2 eno1 ether routable configured 3 enp5s0 ether off unmanaged 4 virbr0 ether no-carrier unmanaged 5 virbr0-nic ether off unmanaged 5 links listed.

After:

IDX LINK TYPE OPERATIONAL SETUP 1 lo loopback carrier unmanaged 2 bond0 ether off unmanaged 3 bond1 ether routable configured 4 eno1 ether carrier configuring 5 enp5s0 ether no-carrier configuring 6 virbr0 ether no-carrier unmanaged 7 virbr0-nic ether off unmanaged 7 links listed.

Note: systemd automatically creates bond0, it can be ignored.

Status:

cat /proc/net/bonding/bond1
cat /proc/net/bonding/bond1 john@chin Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) Bonding Mode: load balancing (round-robin) MII Status: up MII Polling Interval (ms): 0 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eno1 MII Status: up Speed: 1000 Mbps Duplex: full Link Failure Count: 0 Permanent HW addr: 74:d0:2b:7d:2b:eb Slave queue ID: 0 Slave Interface: enp5s0 MII Status: up Speed: Unknown Duplex: Unknown Link Failure Count: 0 Permanent HW addr: 00:1b:21:63:1f:4d Slave queue ID: 0

Note: DNS using systemd-resolved config in /etc/systemd/resolved.conf

References

https://kerlilow.me/blog/setting-up-systemd-networkd-with-bonding/#setting-up-the-bond https://www.freedesktop.org/software/systemd/man/systemd.netdev.html https://www.reversengineered.com/2014/08/21/setting-up-bonding-in-systemd/

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