Network Bonding

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/