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[Ryan Harper <1694801@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Static IPV6 subnet with a ipv6 route fails to set the default IPV6
gateway.

With cloud-init master:

% cat ipv6-static.yaml
network:
    version: 1
    config:
        - type: physical
          name: interface0
          mac_address: "52:54:00:12:34:00"
          subnets:
              - type: static
                address: 2001:4800:78ff:1b:be76:4eff:fe06:96b3
                netmask: 'ffff:ffff:ffff:ffff::'
                routes:
                  - gateway: 2001:4800:78ff:1b::1
                    netmask: '::'
                    network: '::'

% ./tools/net-convert.py --network-data ipv6-static.yaml \
  --kind yaml --output-kind sysconfig -d target-sysconfig

% grep -nr IPV6_DEFAULTGW target-sysconfig/; echo $?
1

Currently only the subnet is checked for 'ipv6' setting, however, the routes array may include a mix of v4 or v6 configurations, in particular, the gateway
in a route may be ipv6, and if so, should export the value via IPV6_DEFAULTGW in the ifcfg-XXXX file.

Additionally, if the route is v6, it should rendering a routes6-XXXX
file; this is present but missing the 'dev <interface>' scoping.

% cat target-sysconfig/etc/sysconfig/network-scripts/route6-interface0 
# Created by cloud-init on instance boot automatically, do not edit.
#
::/0 via 2001:4800:78ff:1b::1

** Affects: cloud-init
     Importance: Undecided
         Status: New


** Tags: centos7

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https://bugs.launchpad.net/bugs/1694801

Title:
  sysconfig needs fix for ipv6 gateway routes

Status in cloud-init:
  New

Bug description:
  Static IPV6 subnet with a ipv6 route fails to set the default IPV6
  gateway.

  With cloud-init master:

  % cat ipv6-static.yaml
  network:
      version: 1
      config:
          - type: physical
            name: interface0
            mac_address: "52:54:00:12:34:00"
            subnets:
                - type: static
                  address: 2001:4800:78ff:1b:be76:4eff:fe06:96b3
                  netmask: 'ffff:ffff:ffff:ffff::'
                  routes:
                    - gateway: 2001:4800:78ff:1b::1
                      netmask: '::'
                      network: '::'

  % ./tools/net-convert.py --network-data ipv6-static.yaml \
    --kind yaml --output-kind sysconfig -d target-sysconfig

  % grep -nr IPV6_DEFAULTGW target-sysconfig/; echo $?
  1

  Currently only the subnet is checked for 'ipv6' setting, however, the routes array may include a mix of v4 or v6 configurations, in particular, the gateway
  in a route may be ipv6, and if so, should export the value via IPV6_DEFAULTGW in the ifcfg-XXXX file.

  Additionally, if the route is v6, it should rendering a routes6-XXXX
  file; this is present but missing the 'dev <interface>' scoping.

  % cat target-sysconfig/etc/sysconfig/network-scripts/route6-interface0 
  # Created by cloud-init on instance boot automatically, do not edit.
  #
  ::/0 via 2001:4800:78ff:1b::1

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