[Bug 1533631] Re: Failed to renew DHCPv6 lease after suspend

[TJ]

The debug log contains:

Mar 31 01:34:59 hephaestion NetworkManager[9095]: <debug> [1459384499.752259] [dhcp-manager/nm-dhcp-client.c:222] reason_to_state(): (wlp3s0): unmapped DHCP state 'DEPREF6'
Mar 31 01:34:59 hephaestion NetworkManager[9095]: <debug> [1459384499.758516] [dhcp-manager/nm-dhcp-client.c:757] nm_dhcp_client_handle_event(): (wlp3s0): DHCP reason 'DEPREF6' -> state 'unknown'

Network Manager doesn't know how to handle "DEPREF6", which is sent from
isc-dhcp dhclient to the helper script (set by "-sf" option):

client/dhc6.c::do_depref()
{
...
      if (addr->starts + addr->preferred_life <= cur_time) {
        script_init(client, "DEPREF6", NULL);
        dhc6_marshall_values("cur_", client, lease,
                 ia, addr);
        script_write_requested6(client);
        script_go(client);
...
}

So it seems that to correctly solve this issue Network Manager must be
taught how to handle DEPREF6.

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https://bugs.launchpad.net/bugs/1533631

Title:
  Failed to renew DHCPv6 lease after suspend

Status in isc-dhcp package in Ubuntu:
  Triaged
Status in network-manager package in Ubuntu:
  Triaged

Bug description:
  After fixing IPv6 address assignment (#1469346), IPv6 works fine until
  sleep. On wake up ubuntu fails to renew its IPv6 lease:

  Jan 13 10:47:47 ubuntu dhclient: PRC: Renewing lease on wlp3s0.
  Jan 13 10:47:47 ubuntu dhclient: PRC: Rebinding lease on wlp3s0.
  Jan 13 10:47:47 ubuntu dhclient: XMT: Rebind on wlp3s0, interval 9890ms.
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): DHCPv6 state changed bound -> unknown
  Jan 13 10:47:47 ubuntu dhclient: PRC: Address 2a02:xxxx:xxxx:xxxx::b44 depreferred.
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): DHCPv6 state changed unknown -> expire
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): canceled DHCP transaction, DHCP client pid 1170
  Jan 13 10:47:47 ubuntu NetworkManager[796]: <info>  (wlp3s0): DHCPv6 state changed expire -> done

  I'm not sure that it's solely NetworkManager issue (dhclient could
  also be affected).

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