docs: Update README.md

Updating README.md to reflect some recently added changes or features.

Signed-off-by: Wen Liang <liangwen12year@gmail.com>

README.md

@@ -20,22 +20,28 @@ This role can be used to configure:
 ## Introduction
 
 The  `network` role supports two providers: `nm` and `initscripts`. `nm` is
-used by default in RHEL7 and `initscripts` in RHEL6. These providers can be
-configured per host via the [`network_provider`](#variables) variable. In
-absence of explicit configuration, it is autodetected based on the
-distribution. However, note that either `nm` or `initscripts` is not tied to a certain
-distribution. The `network` role works everywhere the required API is available.
-This means that `nm` requires at least NetworkManager's API version 1.2 available.
-For `initscripts`, the legacy network service is required as used in Fedora or RHEL.
+used by default since RHEL7 and `initscripts` in RHEL6. The `initscripts` provider
+requires `network-scripts` package which is deprecated in RHEL8 and dropped in
+RHEL9. These providers can be configured per host via the
+[`network_provider`](#variables) variable. In absence of explicit configuration, it is
+autodetected based on the distribution. However, note that either `nm` or `initscripts`
+is not tied to a certain distribution. The `network` role works everywhere the required
+API is available. This means that `nm` requires at least NetworkManager's API version 1.2
+available and certain settings supported by `nm` provider also requires higher
+NetworkManager's API version since which the settings are introduced.
+
+The `network` role supports two modules: `network_connections` and `network_state`.
 
 For each host a list of networking profiles can be configured via the
 `network_connections` variable.
 
 - For `initscripts`, profiles correspond to ifcfg files in the
-  `/etc/sysconfig/network-scripts/` directory.
+  `/etc/sysconfig/network-scripts/` directory and those ifcfg files
+  has the line `NM_CONTROLLED=no` written.
 
-- For `nm`, profiles correspond to connection profiles as handled by
-  NetworkManager.
+- For `nm`, profiles correspond to connection profiles are handled by
+  NetworkManager and only NetworkManager keyfile format profiles are
+  supported in `/etc/NetworkManager/system-connections/` since RHEL9.
 
 For each host the network state configuration can also be applied to the interface
 directly via the `network_state` variable, and only the `nm` provider supports using
@@ -239,6 +245,7 @@ The `type` option can be set to the following values:
 - `macvlan`
 - `infiniband`
 - `wireless`
+- `dummy`
 
 #### `type: ethernet`
 
@@ -259,7 +266,8 @@ The `bridge`, `bond`, `team` device types work similar. Note that `team` is not
 supported in RHEL6 kernels, and has been deprecated in RHEL 9.
 
 For ports, the `port_type` and `controller` properties must be set. Note that ports
-should not have `ip` settings.
+should not have `ip` settings, which means that the active ports will not have IP
+addresses assigned.
 
 The `controller` refers to the `name` of a profile in the Ansible
 playbook. It is neither an interface-name nor a connection-id of
@@ -333,6 +341,11 @@ The following options are supported:
 
 - `password`: password for the network (required if `wpa-psk` or `sae` is used)
 
+#### `type: dummy`
+
+Dummy network interface, `nm` (NetworkManager) is the only supported `network_provider`
+for this type.
+
 ### `autoconnect`
 
 By default, profiles are created with autoconnect enabled.
@@ -634,7 +647,6 @@ The IP configuration supports the following options:
 - `rule_append_only`
 
   The `rule_append_only` boolean option allows to preserve the current routing rules.
-  Note that specifying routing rules is not supported yet.
 
 **Note:** When `route_append_only` or `rule_append_only` is not specified, the network
 role deletes the current routes or routing rules.
@@ -1333,6 +1345,9 @@ Depending on NetworkManager's configuration, connections may be stored as ifcfg
 as well, but it is not guaranteed that plain initscripts can handle these ifcfg files
 after disabling the NetworkManager service.
 
+The `network` role also supports configuring in certain Ansible distributions that the
+role treats like RHEL, such as AlmaLinux, CentOS, OracleLinux, Rocky.
+
 ## Limitations
 
 As Ansible usually works via the network, for example via SSH, there are some