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[OpenStack Infra <1884105@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/736778
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8eb4955bb62ec02b7a5cb725067c6193c37f9b0e
Submitter: Zuul
Branch:    master

commit 8eb4955bb62ec02b7a5cb725067c6193c37f9b0e
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Thu Jun 18 17:03:47 2020 +0000

    Fixes dnsmasq host file parsing with "addr6_list"
    
    This patch fixes:
    - The IPv6 tag added in the "host" file if is supported in
      dnsmasq. That shifts all other parameters in the register.
    - IPv6 registers can have more than one IP address; in this
      case, the method "_read_hosts_file_leases" should return a
      tuple per IP address.
    
    Change-Id: I4d0bc1eb9448366d8f1b2dacc9c5c2e4e6958253
    Closes-Bug: #1884105


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1884105

Title:
  [DHCP] IPv6 "addr6_list" change the "host" file format

Status in neutron:
  Fix Released

Bug description:
  This bug could be divided in two:
  1) IPv6 tags feature [1] introduces, if supported by the dnsmasq version, a new element in the "host" file, the tag:
  fa:16:3e:6b:c1:97,tag:dhcpv6,host-fe32-dead-beef--5.localdomain,[fe32:dead:beef::5]

  That will shift all other parameters and should be considered when
  parsing this file.

  2) The IPv6 registers (lines in "host" file) can have more than one IP
  address. Each one should be registered as a new item in the set
  returned in [2]

  [1]https://review.opendev.org/#/q/I833840e7daed2efa7efaece27cfd1ba28e0feb90
  [2]https://github.com/openstack/neutron/blob/7d8f400791707e5db7839dcdf3ef4dbbd1dd39bc/neutron/agent/linux/dhcp.py#L876-L894

  
  NOTE: the fix for this bug should be cherry-picked up to Train.

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