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[alisafari <2063081@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Imaging following setup:

Subnet S-A on Network N-A connected to Router R-A which has an external gateway on External Provider Network Public. 
Subnet S-B on Network N-B connected to Router R-B which has an external gateway on External Provider Network Public.
Server A with a port on Subnet S-A
Server B with a port on Subnet S-B
Load Balancer LB-A on Subnet S-A load balancing port 22 towards Server A's port 22.
Floating IP FIP-LB-A connected to LB-A.

Consider following scenario:

connecting to Floating IP FIP-LB-A form Server S-B is not possible.

Based on what we investigated, when Router Gateway Port of Router R-A
and R-B are placed on different Nodes, connection is possible and
everything works fine.

But when they take place on the same Node, connectivity to Load Balancers port is not possible.
Also icmp connectivity (ping) from Server A to the external gateway of Router R-B is also impossible.

Versions:

OVN
-------
ovn-nbctl --version
ovn-nbctl 22.03.2
Open vSwitch Library 2.17.5
DB Schema 6.1.0


Neutron
--------
stable/2023.1 commit 643dbbbf6bbf7601b3deb07096339e0ec72e57a5

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ovn ovn-octavia-provider

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https://bugs.launchpad.net/bugs/2063081

Title:
  [ovn] connectivity to load balancer with FIP from a server connected
  to a router with external  gateway

Status in neutron:
  New

Bug description:
  Imaging following setup:

  Subnet S-A on Network N-A connected to Router R-A which has an external gateway on External Provider Network Public. 
  Subnet S-B on Network N-B connected to Router R-B which has an external gateway on External Provider Network Public.
  Server A with a port on Subnet S-A
  Server B with a port on Subnet S-B
  Load Balancer LB-A on Subnet S-A load balancing port 22 towards Server A's port 22.
  Floating IP FIP-LB-A connected to LB-A.

  Consider following scenario:

  connecting to Floating IP FIP-LB-A form Server S-B is not possible.

  Based on what we investigated, when Router Gateway Port of Router R-A
  and R-B are placed on different Nodes, connection is possible and
  everything works fine.

  But when they take place on the same Node, connectivity to Load Balancers port is not possible.
  Also icmp connectivity (ping) from Server A to the external gateway of Router R-B is also impossible.

  Versions:

  OVN
  -------
  ovn-nbctl --version
  ovn-nbctl 22.03.2
  Open vSwitch Library 2.17.5
  DB Schema 6.1.0

  
  Neutron
  --------
  stable/2023.1 commit 643dbbbf6bbf7601b3deb07096339e0ec72e57a5

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