https://www.unixmen.com/linux-basics-create-network-bonding-on-ubuntu-14-10/
I have configured the bonding with mode 1 :bond-mode active-backup.
ln@ubuntu:~$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
auto ens33
iface ens33 inet manual
bond-master bond0
bond-primary ens33
#eth2 configuration
auto ens38
iface ens38 inet manual
bond-master bond0
# Bonding eth1 & eth2 to create bond0 NIC
auto bond0
iface bond0 inet static
address 192.168.199.71
gateway 192.168.199.1
netmask 255.255.255.0
bond-mode active-backup
bond-miimon 100
bond-updelay 500
bond-slaves none
ens33 is bond-primary. when ens33 is unavailable , ens38 start work , then ens33 is available , the network will not work . ping will failed.
From 192.168.199.71 icmp_seq=3 Destination Host Unreachable
how to resolve this?