
Explanation:
A Point-to-Site (P2S) VPN gateway connection lets you create a secure connection to your virtual network from an individual client computer. A P2S connection is established by starting it from the client computer.
Step 1: Create a new subnet in VNet1
Do I need a gateway subnet?
Yes. The gateway subnet contains the IP addresses that the virtual network gateway services use. You need to create a gateway subnet for your virtual network in order to configure a virtual network gateway.
Step 2: Add an IP address pool.
When you create the gateway subnet, you specify the number of IP addresses that the subnet contains. The IP addresses in the gateway subnet are allocated to the gateway service.
Some configurations require more IP addresses to be allocated to the gateway services than do others. Make sure that your gateway subnet contains enough IP addresses to accommodate future growth and possible new connection configurations.
Step 3: Create a VPN gateway
Reference:
https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-vpn-faq
https://learn.microsoft.com/en-us/azure/vpn-gateway/point-to-site-about