Router Can't ping instance

[Umesh Regmi]

Hi,

Recently I created debian 9.9 image in the Ubuntu openstack and I was able
to create instance from the image.I assigned floating ip to the interface.I
tried to ping floating ip from the router.It is unreachable.I can ping
external/internal gateway from the router.It perfectly works on the ubuntu
xenial image.Am I missing something here?

Thanks,
Umesh.