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FarO
Asked: 2019-03-25 13:54:49 +0800 CST

Why do I have different IP addresses on bond0, en01 and enp2s0?

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I set up a network bonding for failsafe in Ubuntu 18.04 according to this netplan:

network:
    version: 2
    ethernets:
        eno1:
            dhcp4: no
        enp2s0:
            dhcp4: no
    bonds:
        bond0:
            addresses: [192.168.3.5/24]
            gateway4: 192.168.3.253
            nameservers:
                addresses: [208.67.222.222,208.67.220.220,8.8.8.8,8.8.4.4]
            dhcp4: no
            interfaces:
                - eno1
                - enp2s0
            parameters:
                mode: active-backup
                primary: eno1

Now when I log in I get:

IP address for enp2s0:  192.168.3.96
IP address for eno1:    192.168.3.96
IP address for bond0:   192.168.3.5

and ifconfig gives me (abridged):

bond0: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST>  mtu 1500
        inet 192.168.3.5  netmask 255.255.255.0  broadcast 192.168.3.255
        inet6 xxx:a31d  prefixlen 64  scopeid 0x20<link>
        ether xxx:a3:1d  txqueuelen 1000  (Ethernet)

eno1: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        inet 192.168.3.96  netmask 255.255.255.0  broadcast 192.168.3.255
        ether xxx:a3:1d  txqueuelen 1000  (Ethernet)

enp2s0: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        inet 192.168.3.96  netmask 255.255.255.0  broadcast 192.168.3.255
        ether xxx:a3:1d  txqueuelen 1000  (Ethernet)

I am sure that, before the bond was set, one of the two MACs ended with :a3:1c

Did I make mistakes while setting the bond, or is this an intended behaviour?

Edit

I had to reinstall and this is the file that the installer generated for my same configuration, including the bond:

network:
    bonds:
        bond0:
            addresses:
            - 192.168.3.5/24
            gateway4: 192.168.3.253
            interfaces:
            - eno1
            - enp2s0
            nameservers:
                addresses:
                - 8.8.8.8
                - 8.8.4.4
            parameters:
                mode: active-backup
    ethernets:
        eno1: {}
        enp2s0: {}
    version: 2
network-bonding

1 Answers

  1. Best Answer

    Minor edits... watch the indents, spacing, and no tabs...

    network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      optional: true
    enp2s0:
      optional: true
  bonds:
    bond0:
      interfaces: [en01, enp2s0]
      addresses: [192.168.3.5/24]
      gateway4: 192.168.3.253 # are you sure it's .253?
      nameservers:
        addresses: [208.67.222.222, 208.67.220.220, 8.8.8.8, 8.8.4.4]
      parameters:
        mode: active-backup
        primary: eno1

    sudo netplan --debug generate # generate config files

    sudo netplan apply # apply configuration

    reboot # insure proper operation

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