Also on the 'Node1', floatingIP is configured but the DNAT rule is missing in the router namespace.

stack@ubuntu-controller:~/devstack$ neutron floatingip-list
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+--------------------------------------+----------------------------------+------------------+---------------------+--------------------------------------+
| id                                   | tenant_id                        | fixed_ip_address | floating_ip_address | port_id                              |
+--------------------------------------+----------------------------------+------------------+---------------------+--------------------------------------+
| 0fd57315-51d7-4277-9835-e3aee82a5773 | 948bc6fadbbc4ca4ad4d223dcc76b9f1 | 10.0.0.3         | 192.168.100.104     | 9187cca2-a96f-495f-abf4-041de154fc95 |
| 5ad5be80-f720-47b0-a05e-4b309d192daf | 948bc6fadbbc4ca4ad4d223dcc76b9f1 | 10.0.0.13        | 192.168.100.100     | 95e78c3c-21a2-4d62-9fc9-ad5451ef73cd |
| 6fc89fb9-ffc7-438d-8320-23c44de2ab09 | 948bc6fadbbc4ca4ad4d223dcc76b9f1 | 10.0.0.14        | 192.168.100.114     | e4b5e14e-6625-4bbb-884c-36f94dbc609d |
+--------------------------------------+----------------------------------+------------------+---------------------+--------------------------------------+


root@ubuntu-controller:~/devstack# iptables -t nat -S
-P PREROUTING ACCEPT
-P INPUT ACCEPT
-P OUTPUT ACCEPT
-P POSTROUTING ACCEPT
-N neutron-l3-agent-OUTPUT
-N neutron-l3-agent-POSTROUTING
-N neutron-l3-agent-PREROUTING
-N neutron-l3-agent-float-snat
-N neutron-l3-agent-snat
-N neutron-postrouting-bottom
-A PREROUTING -j neutron-l3-agent-PREROUTING
-A OUTPUT -j neutron-l3-agent-OUTPUT
-A POSTROUTING -j neutron-l3-agent-POSTROUTING
-A POSTROUTING -j neutron-postrouting-bottom
-A neutron-l3-agent-POSTROUTING ! -i rfp-6f01678c-6 ! -o rfp-6f01678c-6 -m conntrack ! --ctstate DNAT -j ACCEPT
-A neutron-l3-agent-PREROUTING -d 169.254.169.254/32 -i qr-+ -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 9697
-A neutron-l3-agent-snat -j neutron-l3-agent-float-snat
-A neutron-postrouting-bottom -m comment --comment "Perform source NAT on outgoing traffic." -j neutron-l3-agent-snat

There are not "DNAT" rules seen in the router namespace.

But the IP rule shows 54170: from 10.0.0.3 lookup 16 is defined.

root@ubuntu-controller:~/devstack# ip rule
0:	from all lookup local 
32766:	from all lookup main 
32767:	from all lookup default 
54170:	from 10.0.0.3 lookup 16 
167772161:	from 10.0.0.1/28 lookup 167772161 
root@ubuntu-controller:~/devstack# 

The fipnamespace also has the routes required to route the traffic for the floatingip. (192.168.100.104).

stack@ubuntu-controller:~/devstack$ sudo ip netns exec fip-5c94b420-0b1f-4025-864a-9209d8e7211f bash
root@ubuntu-controller:~/devstack# ifconfig
fg-687a771e-78 Link encap:Ethernet  HWaddr fa:16:3e:81:97:2e  
          inet addr:192.168.100.105  Bcast:192.168.100.255  Mask:255.255.255.0
          inet6 addr: fe80::f816:3eff:fe81:972e/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:290 errors:0 dropped:0 overruns:0 frame:0
          TX packets:114 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:26045 (26.0 KB)  TX bytes:15101 (15.1 KB)

fpr-24ee8045-1 Link encap:Ethernet  HWaddr 16:f4:be:5b:39:72  
          inet addr:169.254.119.67  Bcast:0.0.0.0  Mask:255.255.255.254
          inet6 addr: fe80::14f4:beff:fe5b:3972/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:738 (738.0 B)  TX bytes:958 (958.0 B)

fpr-6f01678c-6 Link encap:Ethernet  HWaddr 32:44:92:f3:90:01  
          inet addr:169.254.113.29  Bcast:0.0.0.0  Mask:255.255.255.254
          inet6 addr: fe80::3044:92ff:fef3:9001/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:96 errors:0 dropped:0 overruns:0 frame:0
          TX packets:113 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:14345 (14.3 KB)  TX bytes:19510 (19.5 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@ubuntu-controller:~/devstack# ip route
169.254.113.28/31 dev fpr-6f01678c-6  proto kernel  scope link  src 169.254.113.29 
169.254.119.66/31 dev fpr-24ee8045-1  proto kernel  scope link  src 169.254.119.67 
192.168.100.0/24 dev fg-687a771e-78  proto kernel  scope link  src 192.168.100.105 
192.168.100.104 via 169.254.113.28 dev fpr-6f01678c-6 
root@ubuntu-controller:~/devstack# exit