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MAC address of bonding in Ubuntu 18.04
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bonding-mac-address.md

I'm on Ubuntu 18.04. According to the pastes below:

  • mac address of eno1 0c:c4:7a:c6:ae:26
  • mac address of eno2 0c:c4:7a:c6:ae:27
  • mac address of bond1 (bondig of eno1 and eno2) 92:da:30:66:27:50

Why 92:da:30:66:27:50 for bond1? No relation with the mac address of eno1 and eno2.

Here is the content of /etc/netplan/01-netcfg.yaml
network:
  version: 2
  renderer: networkd
  bonds:
    bond0:
      addresses:
      - 192.168.235.133/25
      gateway4: 192.168.235.254
      interfaces:
      - enp2s0f0
      - enp2s0f1
      nameservers:
        addresses:
        - 172.31.131.21
        - 172.31.131.31
        search:
        - mgt.in.ac-versailles.fr
      parameters:
        mii-monitor-interval: 100
        mode: active-backup
    bond1:
      addresses:
      - 10.90.90.1/24
      interfaces:
      - eno1
      - eno2
      parameters:
        mii-monitor-interval: 100
        mode: active-backup
  ethernets:
    eno1:
      dhcp4: 'no'
    eno2:
      dhcp4: 'no'
    enp2s0f0:
      dhcp4: 'no'
    enp2s0f1:
      dhcp4: 'no'
The output of some commands:
~$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: bond1: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 92:da:30:66:27:50 brd ff:ff:ff:ff:ff:ff
3: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 86:ee:c1:e3:19:e8 brd ff:ff:ff:ff:ff:ff
4: enp2s0f0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP mode DEFAULT group default qlen 1000
    link/ether 86:ee:c1:e3:19:e8 brd ff:ff:ff:ff:ff:ff
5: enp2s0f1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP mode DEFAULT group default qlen 1000
    link/ether 86:ee:c1:e3:19:e8 brd ff:ff:ff:ff:ff:ff
6: eno1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP mode DEFAULT group default qlen 1000
    link/ether 92:da:30:66:27:50 brd ff:ff:ff:ff:ff:ff
7: eno2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP mode DEFAULT group default qlen 1000
    link/ether 92:da:30:66:27:50 brd ff:ff:ff:ff:ff:ff


~$ ip address
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    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 
       valid_lft forever preferred_lft forever
2: bond1: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 92:da:30:66:27:50 brd ff:ff:ff:ff:ff:ff
    inet 10.90.90.1/24 brd 10.90.90.255 scope global bond1
       valid_lft forever preferred_lft forever
    inet6 fe80::90da:30ff:fe66:2750/64 scope link 
       valid_lft forever preferred_lft forever
3: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 86:ee:c1:e3:19:e8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.235.133/25 brd 192.168.235.255 scope global bond0
       valid_lft forever preferred_lft forever
    inet6 fe80::84ee:c1ff:fee3:19e8/64 scope link 
       valid_lft forever preferred_lft forever
4: enp2s0f0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP group default qlen 1000
    link/ether 86:ee:c1:e3:19:e8 brd ff:ff:ff:ff:ff:ff
5: enp2s0f1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond0 state UP group default qlen 1000
    link/ether 86:ee:c1:e3:19:e8 brd ff:ff:ff:ff:ff:ff
6: eno1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP group default qlen 1000
    link/ether 92:da:30:66:27:50 brd ff:ff:ff:ff:ff:ff
7: eno2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP group default qlen 1000
    link/ether 92:da:30:66:27:50 brd ff:ff:ff:ff:ff:ff
 
 
~$ cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: enp2s0f0
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: enp2s0f0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 0c:c4:7a:83:fe:fe
Slave queue ID: 0

Slave Interface: enp2s0f1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 0c:c4:7a:83:fe:ff
Slave queue ID: 0


~$ cat /proc/net/bonding/bond1
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: None
Currently Active Slave: eno2
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eno2
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 0c:c4:7a:c6:ae:27
Slave queue ID: 0

Slave Interface: eno1
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 0c:c4:7a:c6:ae:26
Slave queue ID: 0
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