Update network-requirements.md

removed gateway as it's no longer a requirement and added an example of configuration file

Author: alt-key

articles/azure-arc/resource-bridge/network-requirements.md

@@ -19,14 +19,29 @@ Static configuration is recommended for Arc resource bridge because the resource
 
 The subnet of the IP addresses for Arc resource bridge must lie in the IP address prefix that is passed in the `ipaddressprefix` parameter of the `createconfig` command. The IP address prefix is the IP prefix that is exposed by the network to which Arc resource bridge is connected. It is entered as the subnet's IP address range for the virtual network and subnet mask (IP Mask) in CIDR notation, for example `192.168.7.1/24`. Consult your system or network administrator to obtain the IP address prefix in CIDR notation. An IP Subnet CIDR calculator may be used to obtain this value.
 
-### Gateway
-
-The gateway address provided in the `createconfig` command must be in the same subnet specified in the IP address prefix.
-
 ### DNS Server
 
 DNS Server must have internal and external endpoint resolution. The appliance VM and control plane need to resolve the management machine and vice versa. All three must be able to reach the required URLs for deployment.
 
+### Configuration file example
+
+The example below highlights a couple key requirements for Arc resource bridge when creating the configuration files. The IPs for k8snodeippoolstart and k8snodeippoolend reside in the subnet range designated in ipaddressprefix. The ipaddressprefix is provided in the format of the subnet's IP address range for the virtual network and subnet mask (IP Mask) in CIDR notation.
+
+azurestackhciprovider:
+<br> virtualnetwork:
+<br>        name: "mgmtvnet"
+<br>        vswitchname: "Default Switch"
+<br>        type: "Transparent"
+<br>        macpoolname: 
+<br>        vlanid: 0
+<br>        ipaddressprefix: 172.16.0.0/16
+<br>        gateway: 17.16.1.1
+<br>        dnsservers: 17.16.0.1
+<br>        vippoolstart: 172.16.250.0
+<br>        vippoolend: 172.16.250.254
+<br>        k8snodeippoolstart: 172.16.30.0
+<br>        k8snodeippoolend: 172.16.30.254
+
 ## General network requirements
 
 [!INCLUDE [network-requirement-principles](../includes/network-requirement-principles.md)]