Mwan3 failover failed

For Developers
1

I am trying to use wan failover using mwan3. When both of my interface are up, router is forwarding the packet just fine. But when my primary inteface goes down, secondary goes down as well.

Also ping results in unreachable.

mwan3 configuration:

config interface 'wan'
	option enabled '1'
	option reliability '1'
	option count '1'
	option timeout '2'
	option interval '5'
	option down '3'
	list track_ip '8.8.8.8'
	option up '1'

config interface 'wan2'
	option enabled '1'
	option reliability '1'
	option count '1'
	option timeout '2'
	option interval '5'
	option down '3'
	list track_ip '8.8.4.4'
	option up '1'

config member 'wan_m1_w3'
	option interface 'wan'
	option metric '1'
	option weight '3'

config member 'wan_m2_w3'
	option interface 'wan'
	option metric '2'
	option weight '3'

config member 'wan2_m1_w2'
	option interface 'wan2'
	option metric '1'
	option weight '2'

config member 'wan2_m2_w2'
	option interface 'wan2'
	option metric '2'
	option weight '2'

config policy 'wan_only'
	list use_member 'wan_m1_w3'

config policy 'wan2_only'
	list use_member 'wan2_m1_w2'

config policy 'balanced'
	list use_member 'wan_m1_w3'
	list use_member 'wan2_m1_w2'

config policy 'wan_wan2'
	list use_member 'wan_m1_w3'
	list use_member 'wan2_m2_w2'

config policy 'wan2_wan'
	list use_member 'wan_m2_w3'
	list use_member 'wan2_m1_w2'

config rule 'default_rule'
	option dest_ip '0.0.0.0/0'
	option use_policy 'wan_wan2'