Sorry I forgot to upload that!

# maas-rack support-dump --networking
### get_ip_addr() ###
{'eth0': {'flags': ['BROADCAST', 'MULTICAST', 'UP', 'LOWER_UP'],
          'index': 71,
          'inet': ['10.0.0.2/24'],
          'mac': '00:16:3e:99:01:3b',
          'name': 'eth0',
          'parent': 'if72',
          'settings': {'group': 'default',
                       'mtu': '1500',
                       'qdisc': 'noqueue',
                       'qlen': '1000',
                       'state': 'UP'},
          'type': 'ethernet'},
 'lo': {'flags': ['LOOPBACK', 'UP', 'LOWER_UP'],
        'index': 1,
        'inet': ['127.0.0.1/8'],
        'inet6': ['::1/128'],
        'name': 'lo',
        'settings': {'group': 'default',
                     'mtu': '65536',
                     'qdisc': 'noqueue',
                     'qlen': '1000',
                     'state': 'UNKNOWN'},
        'type': 'loopback'},
 'virbr0': {'bridged_interfaces': ['virbr0-nic'],
            'flags': ['NO-CARRIER', 'BROADCAST', 'MULTICAST', 'UP'],
            'index': 2,
            'inet': ['192.168.122.1/24'],
            'mac': '52:54:00:3a:01:36',
            'name': 'virbr0',
            'settings': {'group': 'default',
                         'mtu': '1500',
                         'qdisc': 'noqueue',
                         'qlen': '1000',
                         'state': 'DOWN'},
            'type': 'ethernet.bridge'},
 'virbr0-nic': {'flags': ['BROADCAST', 'MULTICAST'],
                'index': 3,
                'mac': '52:54:00:3a:01:36',
                'name': 'virbr0-nic',
                'settings': {'group': 'default',
                             'master': 'virbr0',
                             'mtu': '1500',
                             'qdisc': 'pfifo_fast',
                             'qlen': '1000',
                             'state': 'DOWN'},
                'type': 'ethernet'}}

### get_ip_route() ###
{'default': {'dev': 'eth0', 'via': '10.0.0.1'}}

### get_all_interfaces_definition() ###
{'eth0': {'enabled': True,
          'index': 71,
          'links': [{'address': '10.0.0.2/24',
                     'gateway': '10.0.0.1',
                     'mode': 'static'}],
          'mac_address': '00:16:3e:99:01:3b',
          'monitored': True,
          'parents': [],
          'source': 'ipaddr',
          'type': 'physical'},
 'virbr0': {'enabled': True,
            'index': 2,
            'links': [{'address': '192.168.122.1/24', 'mode': 'static'}],
            'mac_address': '52:54:00:3a:01:36',
            'monitored': False,
            'parents': ['virbr0-nic'],
            'source': 'ipaddr',
            'type': 'bridge'},
 'virbr0-nic': {'enabled': False,
                'index': 3,
                'links': [],
                'mac_address': '52:54:00:3a:01:36',
                'monitored': False,
                'parents': [],
                'source': 'ipaddr',
                'type': 'physical'}}

# cat /etc/network/interfaces.d/eth0.cfg 
# The primary network interface
auto eth0
iface eth0 inet static
    address 10.0.0.2
    netmask 255.255.255.0
    network 10.0.0.0
    broadcast 10.0.0.255
    gateway 10.0.0.1
    # dns-* options are implemented by the resolvconf package, if installed
    dns-nameservers 10.0.0.1
    dns-search maas