# Network Bonding Going from a one interface setup, to two bonded: Before: ```shell nano /etc/systemd/network/25-wired.network ``` ```shell [Match] Name=eno1 [Network] Address=172.20.20.2/24 Gateway=172.20.20.1 ``` Create the [netdev](https://www.freedesktop.org/software/systemd/man/systemd.netdev.html) bond file `/etc/systemd/network/25-bond1.netdev`. ```shell nano /etc/systemd/network/25-bond1.netdev ``` ```shell [NetDev] Name=bond1 Kind=bond #default is "balance-rr" (round robin) [Bond] #Mode="balance-rr ``` Create network for bond. ```shell nano /etc/systemd/network/25-bond1.network ``` ```shell [Match] Name=bond1 [Network] Address=172.20.20.2/24 Gateway=172.20.20.1 ``` Select interfaces. ```shell nano /etc/systemd/network/20-eno1.network ``` ```shell [Match] Name=eno1 [Network] Bond=bond1 ``` ```shell nano /etc/systemd/network/25-enp5s0.network ``` ```shell [Match] Name=enp5s0 [Network] Bond=bond1 ``` Restart network: ```shell systemctl restart systemd-resolved systemd-networkd ``` Check if functional: ```shell networkctl ``` Before: ```shell 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: ```shell 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: ```shell cat /proc/net/bonding/bond1 ``` ```shell 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