2*NIC Active-Backup Mode Bonding

nmcli

Network Manager Command-Line-Interface

$ nmcli --help

---
Usage: nmcli [OPTIONS] OBJECT { COMMAND | help }

OPTIONS
-t[erse]                                       terse output
-p[retty]                                      pretty output
-m[ode] tabular|multiline                      output mode
-c[olors] auto|yes|no                          whether to use colors in output
-f[ields] <field1,field2,...>|all|common       specify fields to output
-g[et-values] <field1,field2,...>|all|common   shortcut for -m tabular -t -f
-e[scape] yes|no                               escape columns separators in values
-a[sk]                                         ask for missing parameters
-s[how-secrets]                                allow displaying passwords
-w[ait] <seconds>                              set timeout waiting for finishing operations
-v[ersion]                                     show program version
-h[elp]                                        print this help

OBJECT
g[eneral]       NetworkManager's general status and operations
n[etworking]    overall networking control
r[adio]         NetworkManager radio switches
c[onnection]    NetworkManager's connections
d[evice]        devices managed by NetworkManager
a[gent]         NetworkManager secret agent or polkit agent
m[onitor]       monitor NetworkManager changes
---

2*NIC Active-Backup Mode Bonding

$ nmcli d

---
DEVICE TYPE STATE CONNECTION
ens33 ethernet connected ens33
ens34 ethernet disconnected --
ens35 ethernet disconnected --
lo loopback unmanaged --
---

$ nmcli connection modify ens34 connection.autoconnect no
$ nmcli connection modify ens35 connection.autoconnect no
$ nmcli connection add type bond con-name bond0 ifname bond0 mode active-backup

---
Connection 'bond0' (7bfe221e-646e-420f-8fff-0a0d86d90d3c) successfully added.
---

$ nmcli d

---
DEVICE TYPE STATE CONNECTION
ens33 ethernet connected ens33
bond0 bond connecting (getting IP configuration) bond0
ens34 ethernet disconnected --
ens35 ethernet disconnected --
lo loopback unmanaged --
---

$ nmcli connection add type bond-slave ifname ens34 master bond0

---
Connection 'bond-slave-ens34' (a574ae0e-91cc-4251-ae08-e4a280407869) successfully added.
---

$ nmcli connection add type bond-slave ifname ens35 master bond0

---
Connection 'bond-slave-ens35' (9285c100-e32f-46db-9571-b9f5d2f37b4b) successfully added.
---

$ nmcli connection modify bond0 ipv4.method manual connection.autoconnect yes ipv4.address 10.10.10.40/24 ipv4.gateway 10.10.10.2 ipv4.dns 10.10.10.2

$ nmcli connection modify bond0 +bond.options primary=ens34 +bond.options miimon=100 +bond.options updelay=0 +bond.options downdelay=0

$ nmcli d

---
DEVICE TYPE STATE CONNECTION
bond0 bond connected bond0
ens33 ethernet connected ens33
ens34 ethernet connected bond-slave-ens34
ens35 ethernet connected bond-slave-ens35
lo loopback unmanaged --
---

$ systemctl restart network