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Description of problem:
upping connection with ipv6 shared enabled is not supported:
Error: Connection activation failed: Sharing IPv6 connections is not supported yet.

Version-Release number of selected component (if applicable):
NetworkManager-1.0.4-9.el7.ppc64le

How reproducible:
always

Steps to Reproduce:
1.nmcli connection add type ethernet con-name ethie ifname eth1
2.nmcli connection edit id ethie
3.set ipv6.method shared
4.save
5.quit
6.nmcli connection up id ethie 

Actual results:
Error: Connection activation failed: Sharing IPv6 connections is not supported yet.

Expected results:
dnsmasq running with ipv6 ra functionality enabled. connection upped.

Additional info:

There are some proposals for this feature in upstream bug:

  https://bugzilla.gnome.org/show_bug.cgi?id=593815

Looks like the most straightforward way to get the functionality is the NDP proxying. However the kernel part is not good enough at this point :(

Adding a blocker bug.

Merged upstream ecc6040cd8ecce37685c8433810be16ff35096da

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/RHSA-2017:2299