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[LIU Yulong <1752903@xxxxxxxxxxxxxxxxxx>]

Add service type [1] to your subnets of public network, then it will overcome the 'problem'.
It's a bit complicated because there are some deployment and usage situations:

1. None DVR and IPv4 only
(1) public network has only one subnet which is serving for floating IP and external gateways.
set "network:floatingip", "network:router_gateway" to this subnet.

(2) public network two types of subnet, one is for floating IP, one for external gatewy.
set "network:floatingip" one
set "network:router_gateway" to another

2. DVR and IPv4 only
(1) public network has only one subnet which is serving for floating IP and external gateways.
set "network:floatingip", "network:router_gateway", "network:floatingip_agent_gateway" to this subnet.

(2) public network two types of subnet, one is for floating IP, one for external gatewy.
set "network:floatingip" one
set "network:router_gateway", "network:floatingip_agent_gateway" to another


3. None DVR and IPv4 + IPv6
4. DVR and IPv4 + IPv6

For 3. and 4., the public network may have one IPv6 subnet, set
"network:router_gateway" and "network:floatingip_agent_gateway" to it.

But for now, DVR with IPv6 in compute node does not work.

[1] https://specs.openstack.org/openstack/neutron-specs/specs/newton
/subnet-service-types.html

** Changed in: neutron
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1752903

Title:
  Floating IPs should not allocate IPv6 addresses

Status in neutron:
  Won't Fix

Bug description:
  When there are both IPv4 and IPv6 subnets on the public network, the
  port that a floating IP allocates there gets assigned addresses from
  both subnets. Since a floation IP is a pure IPv4 construct, allocating
  an IPv6 address for it is completely useless and should be avoided,
  because it will for example block removing the IPv6 subnet without a
  good reason. Seen in Pike as well as in master.

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