I have /etc/network/interfaces as follow. Every time the system boots up, the route is wrong so the gateway is not reachable. I'd have to ifdown br0 && ifup br0 to fix the route table and make everything work. How to fix this forever?

auto lo

iface lo inet loopback



auto eth0

iface eth0 inet manual

bond-master bond0



auto eth1

iface eth1 inet manual

bond-master bond0



auto bond0

iface bond0 inet dhcp

 bond-mode balance-tlb

 bond-slaves none



auto br0

iface br0 inet dhcp

 bridge_ports bond0

Edit

This is the route table from ip r s after I reboot the host. There is an extra routing path.

Before restart br0:

default via 10.69.208.129 dev bond0  metric 100 

10.69.208.128/26 dev bond0  proto kernel  scope link  src 10.69.208.172 

10.69.208.128/26 dev br0  proto kernel  scope link  src 10.69.208.172 

169.254.0.0/16 dev br0  scope link  metric 1000 

192.168.1.0/24 dev lxcbr0  proto kernel  scope link  src 192.168.1.1

After restart br0:

default via 10.69.208.129 dev br0  metric 100 

10.69.208.128/26 dev br0  proto kernel  scope link  src 10.69.208.172 

169.254.0.0/16 dev br0  scope link  metric 1000 

192.168.1.0/24 dev lxcbr0  proto kernel  scope link  src 192.168.1.1