Mount IPv6 devices

# Mount IPv6 device with ODL RestConf

## Prerequisites

1. feature:install odl-netconf-clustered-topology
2. feature:install odl-restconf-all

# Mount request

PUT http://localhost:8181/restconf/config/network-topology:network-topology/topology/topology-netconf/node/ipv6-device

Headers:

- Accept: application/josn
- Content-Type: application/json

```
{
"node": [
{
"node-id": "ipv6-device",
"netconf-node-topology:reconnect-on-changed-schema": false,
"netconf-node-topology:password": "admin",
"netconf-node-topology:username": "admin",
"netconf-node-topology:sleep-factor": 1.5,
"netconf-node-topology:port": 12600,
"netconf-node-topology:tcp-only": false,
"netconf-node-topology:connection-timeout-millis": 20000,
"netconf-node-topology:max-connection-attempts": 0,
"netconf-node-topology:host": "::1",
"netconf-node-topology:between-attempts-timeout-millis": 2000,
"netconf-node-topology:keepalive-delay": 120
}
]
}
```
Please note the "host" - "::1" is localhost in IPv6 format.

## Check Connection Status

GET http://localhost:8181/restconf/operational/network-topology:network-topology/topology/topology-netconf/node/ipv6-device

- Accept: application/xml
- Content-Type: application/xml

### Expected result body

```
{
"node": [
{
"node-id": "ipv6-device",
"netconf-node-topology:unavailable-capabilities": {
"unavailable-capability": [...]
},
"netconf-node-topology:available-capabilities": {
"available-capability": [...]
},
"netconf-node-topology:host": "0:0:0:0:0:0:0:1",
"netconf-node-topology:clustered-connection-status": {
"netconf-master-node": "akka.tcp://opendaylight-cluster-data@127.0.0.1:2550"
},
"netconf-node-topology:connection-status": "connected",
"netconf-node-topology:port": 12600
}
]
}
```

Note: using ipv6: fe80::20c:29ff:fef8:337c worked as well.

# Docker and IPv6

See: https://docs.docker.com/v17.09/engine/userguide/networking/default_network/ipv6/#how-ipv6-works-on-docker

# Docker-compose an IPv6

See https://collabnix.com/enabling-ipv6-functionality-for-docker-and-docker-compose/

Please note: version: "2.4" works fine but 3.x not - see https://docs.docker.com/compose/compose-file/
... and the following not (2019-12-21):

```
If IPv6 addressing is desired, the enable_ipv6 option must be set,
and you must use a version 2.x Compose file.
IPv6 options do not currently work in swarm mode.
```

# Kubernetes and IPv6

Please see: https://kubernetes.io/docs/concepts/services-networking/dual-stack/

Currently (2019-12) dual-stack is just in alpha version.