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[Expired for neutron (Ubuntu) because there has been no activity for 60
days.]
** Changed in: neutron (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1924765
Title:
[ovn] fip assignment to instance via router with snat disabled is
broken
Status in neutron:
Expired
Status in neutron package in Ubuntu:
Expired
Bug description:
Ubuntu: 20.04
OpenStack: Ussuri
Networking: OVN (20.03.x)
Network topology:
Geneve overlay network for project networks, router has snat disabled
and the project network and the external network are all in the same
address scope and subnet pool. OVN routers are simply acting as L3
routers and instances on the project network can be directly accessed
by the address assigned to their port (with appropriate route
configuration in the outside of openstack world).
Issue:
Its possible to create and then associate a floating IP on the
external network with an instance attached to the project network -
however this does not work - access to the instance via the FIP is
broken, as is access to its fixed IP (when this worked OK before).
Thoughts:
The concept of a FIP is very much NAT centric, and in the described
configuration NAT is very much disabled. This idea seems to have
worked way back in icehouse, however does not work at Ussuri. If this
is not a supported network model, the association of the FIP to the
instance should error with an appropriate message that NAT is not
supported to the in-path router to the external network.
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