Ubuntu 16.04.03 bonding issues

[Konstantin Raskoshnyi]

Hello everyone,
I set up bonding, here's the config

root at host:/etc/network# cat interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback
# eth0
auto eth0
  iface eth0 inet manual
  bond-master bond0
  bond-primary eth0

# eth1
auto eth1
  iface eth1 inet manual
  pre-up sleep 5
  bond-master bond0


# bond0
auto bond0
iface bond0 inet static
  address 192.168.56.208
  gateway 192.168.56.1
  netmask 255.255.255.0
  bond-mode 1
  bond-miimon 100
  bond-slaves none
root at host:/etc/network#



eth0 becomes master by default and works just fine, when I unplug the cable
from eth0, the logs tell me that eth1 now is master and eth0 is down. But I
cannot ping, ssh to the machine. Also machine cannot ping def gw after
that.

before wire unplugged,

root at host:/etc/network# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: eth0 (primary_reselect always)
Currently Active Slave: eth0
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 2
Permanent HW addr: 08:00:27:99:b8:97
Slave queue ID: 0

Slave Interface: eth1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 08:00:27:2b:f0:2f
Slave queue ID: 0

after

root at host:/etc/network# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: fault-tolerance (active-backup)
Primary Slave: eth0 (primary_reselect always)
Currently Active Slave: eth1
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: down
Speed: Unknown
Duplex: Unknown
Link Failure Count: 3
Permanent HW addr: 08:00:27:99:b8:97
Slave queue ID: 0

Slave Interface: eth1
MII Status: up
Speed: 1000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: 08:00:27:2b:f0:2f
Slave queue ID: 0

Any thoughts?
Thank you
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