Public bug reported:

Create virtual machines under different VPCs and configure corresponding VPN 
services. When the vpn connection is active, virtual machines under different 
VPCs can communicate through the ipsec tunnel.
However, after the virtual machine is bound to the floating ip, the traffic to 
the external network does not pass through the snat namespace, and therefore 
cannot be forwarded through the ipsec tunnel, so the traffic is unreachable.

** Affects: neutron
     Importance: Undecided
         Status: New

** Description changed:

-     Create virtual machines under different VPCs and configure corresponding 
VPN services. When the vpn connection is active, virtual machines under 
different VPCs can communicate through the ipsec tunnel.
-     However, after the virtual machine is bound to the floating ip, the 
traffic to the external network does not pass through the snat namespace, and 
therefore cannot be forwarded through the ipsec tunnel, so the traffic is 
unreachable.
+ Create virtual machines under different VPCs and configure corresponding VPN 
services. When the vpn connection is active, virtual machines under different 
VPCs can communicate through the ipsec tunnel.
+ However, after the virtual machine is bound to the floating ip, the traffic 
to the external network does not pass through the snat namespace, and therefore 
cannot be forwarded through the ipsec tunnel, so the traffic is unreachable.

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https://bugs.launchpad.net/bugs/1874392

Title:
  [VPNaas-DVR]The Traffic is unreachable after the virtual machine is
  bound to the floating IP

Status in neutron:
  New

Bug description:
  Create virtual machines under different VPCs and configure corresponding VPN 
services. When the vpn connection is active, virtual machines under different 
VPCs can communicate through the ipsec tunnel.
  However, after the virtual machine is bound to the floating ip, the traffic 
to the external network does not pass through the snat namespace, and therefore 
cannot be forwarded through the ipsec tunnel, so the traffic is unreachable.

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