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[Doug Fish <drfish@xxxxxxxxxx>]

Public bug reported:

It's not possible to update ipv6 subnet info using Horizon. To recreate:

Setup: create a new network (Admin->System->Networks->Create Network)
create an ipv6 subnet in that network
(new network Detail->Create Subnet)
Network Address: fdc5:f49e:fe9e::/64 
IP Version IPv6
Gateway IP: fdc5:f49e:fe9e::1
click create

To view the problem: Edit the subnet
(Admin->System->Networks>[detail]->Edit Subnet->Subnet Details
attempt to add a DNS name server
fdc5:f49e:fe9e::3

An error is returned: "Error: Failed to update subnet
"fdc5:f49e:fe9e::/64": Cannot update read-only attribute ipv6_ra_mode"

however, it's possible to make the update using
neutron subnet-update --dns-nameserver [ip] [id]

** Affects: horizon
     Importance: Undecided
     Assignee: Doug Fish (drfish)
         Status: New

** Changed in: horizon
     Assignee: (unassigned) => Doug Fish (drfish)

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https://bugs.launchpad.net/bugs/1459446

Title:
  can't update dns for an ipv6 subnet

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  It's not possible to update ipv6 subnet info using Horizon. To
  recreate:

  Setup: create a new network (Admin->System->Networks->Create Network)
  create an ipv6 subnet in that network
  (new network Detail->Create Subnet)
  Network Address: fdc5:f49e:fe9e::/64 
  IP Version IPv6
  Gateway IP: fdc5:f49e:fe9e::1
  click create

  To view the problem: Edit the subnet
  (Admin->System->Networks>[detail]->Edit Subnet->Subnet Details
  attempt to add a DNS name server
  fdc5:f49e:fe9e::3

  An error is returned: "Error: Failed to update subnet
  "fdc5:f49e:fe9e::/64": Cannot update read-only attribute ipv6_ra_mode"

  however, it's possible to make the update using
  neutron subnet-update --dns-nameserver [ip] [id]

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