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Bug 1656018

Summary: [RHOSP13][OVN] OVN and IPv6 networks
Product: Red Hat OpenStack Reporter: Alex Stupnikov <astupnik>
Component: python-networking-ovnAssignee: Numan Siddique <nusiddiq>
Status: CLOSED ERRATA QA Contact: Eran Kuris <ekuris>
Severity: high Docs Contact:
Priority: urgent    
Version: 13.0 (Queens)CC: amuller, apevec, bhaley, chrisw, dalvarez, fgrosjea, fsilva, lhh, lmartins, majopela, nusiddiq, rbdiri, rmeillon, svigan
Target Milestone: z6Keywords: Triaged, ZStream
Target Release: 13.0 (Queens)   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: python-networking-ovn-4.0.3-4.el7ost Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of:
: 1679626 (view as bug list) Environment:
Last Closed: 2019-04-30 17:24:33 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1679626    

Description Alex Stupnikov 2018-12-04 13:25:09 UTC 
Description of problem:

We support production OVN environments since RHOSP 13. Our consultants are actively selling OVN, but neutron+OVN does not fully support IPv6. Please check details below.

OVN routers doesn't support GUA address space for tenant networks in a way that pure neutron does:

- OVN router doesn't proxy IPv6 neighbour discovery process
- OVN router doesn't route IPv6 packets from tenant networks to external gateway (looks like it doesn't have default route towards external gateway).

As a result, it is only possible to use IPv6 tenant networks for local flows inside OpenStack infrastructure: they will not be visible to the Internets.

I would like to use this bug to ask for clarifications from engineering about the way we should configure IPv6 in OVN environments (looks like shared external networks are the only possible option) and to ask for documentation improvements.

I kindly ask you to provide recommendations for IPv6 + OVN environments, that could be translated to customer, since this issue is quite critical. After this you can reduce the severity.
Comment 38 Eran Kuris 2019-04-16 12:14:18 UTC 
verified Default route deletion problem. The issue fixed 
OpenStack/13.0-RHEL-7/2019-04-10.1/
python-networking-ovn-4.0.3-6.el7ost.noarch
setup with Geneve- tunnel type. 
VLAN tenant network
IPv6 slaac method
Comment 40 errata-xmlrpc 2019-04-30 17:24:33 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:0932