"com.docker.network.driver.mtu": "1500"
            },
            "Labels": {}
        }
    ]
    ```

    Containers `alpine3` and `alpine4` are connected to the `bridge` network.

    ```console
    $ docker network inspect alpine-net

    [
        {
            "Name": "alpine-net",
            "Id": "e9261a8c9a19eabf2bf1488bf5f208b99b1608f330cff585c273d39481c9b0ec",
            "Created": "2017-09-25T21:38:12.620046142Z",
            "Scope": "local",
            "Driver": "bridge",
            "EnableIPv6": false,
            "IPAM": {
                "Driver": "default",
                "Options": {},
                "Config": [
                    {
                        "Subnet": "172.18.0.0/16",
                        "Gateway": "172.18.0.1"
                    }
                ]
            },
            "Internal": false,
            "Attachable": false,
            "Containers": {
                "0a02c449a6e9a15113c51ab2681d72749548fb9f78fae4493e3b2e4e74199c4a": {
                    "Name": "alpine1",
                    "EndpointID": "c83621678eff9628f4e2d52baf82c49f974c36c05cba152db4c131e8e7a64673",
                    "MacAddress": "02:42:ac:12:00:02",
                    "IPv4Address": "172.18.0.2/16",
                    "IPv6Address": ""
                },
                "156849ccd902b812b7d17f05d2d81532ccebe5bf788c9a79de63e12bb92fc621": {
                    "Name": "alpine4",
                    "EndpointID": "058bc6a5e9272b532ef9a6ea6d7f3db4c37527ae2625d1cd1421580fd0731954",
                    "MacAddress": "02:42:ac:12:00:04",
                    "IPv4Address": "172.18.0.4/16",
                    "IPv6Address": ""
                },
                "a535d969081e003a149be8917631215616d9401edcb4d35d53f00e75ea1db653": {
                    "Name": "alpine2",
                    "EndpointID": "198f3141ccf2e7dba67bce358d7b71a07c5488e3867d8b7ad55a4c695ebb8740",
                    "MacAddress": "02:42:ac:12:00:03",
                    "IPv4Address": "172.18.0.3/16",
                    "IPv6Address": ""
                }
            },
            "Options": {},
            "Labels": {}
        }
    ]
    ```

    Containers `alpine1`, `alpine2`, and `alpine4` are connected to the
    `alpine-net` network.

5.  On user-defined networks like `alpine-net`, containers can not only
    communicate by IP address, but can also resolve a container name to an IP
    address. This capability is called automatic service discovery. Let's
    connect to `alpine1` and test this out. `alpine1` should be able to resolve
    `alpine2` and `alpine4` (and `alpine1`, itself) to IP addresses.
    
    > [!NOTE]
    > 
    > Automatic service discovery can only resolve custom container names, not default automatically generated container names,

    ```console
    $ docker container attach alpine1

    # ping -c 2 alpine2

    PING alpine2 (172.18.0.3): 56 data bytes
    64 bytes from 172.18.0.3: seq=0 ttl=64 time=0.085 ms
    64 bytes from 172.18.0.3: seq=1 ttl=64 time=0.090 ms

    --- alpine2 ping statistics ---
    2 packets transmitted, 2 packets received, 0% packet loss
    round-trip min/avg/max = 0.085/0.087/0.090 ms

    # ping -c 2 alpine4

    PING alpine4 (172.18.0.4): 56 data bytes
    64 bytes from 172.18.0.4: seq=0 ttl=64 time=0.076 ms
    64 bytes from 172.18.0.4: seq=1 ttl=64 time=0.091 ms

    --- alpine4 ping statistics ---
    2 packets transmitted, 2 packets received, 0% packet loss
    round-trip min/avg/max = 0.076/0.083/0.091 ms

    # ping -c 2 alpine1

    PING alpine1 (172.18.0.2): 56 data bytes
    64 bytes from 172.18.0.2: seq=0 ttl=64 time=0.026 ms
    64 bytes from 172.18.0.2: seq=1 ttl=64 time=0.054 ms

    --- alpine1 ping statistics ---
    2 packets transmitted, 2 packets received, 0% packet loss
    round-trip min/avg/max = 0.026/0.040/0.054 ms
    ```

6.  From `alpine1`, you should not be able to connect to `alpine3` at all, since
    it is not on the `alpine-net` network.