Creating a VPN Tunnel

• Create VPN Gateway.
• Create Customer Gateway and enter Office Gateway IP as Customer gateway IP address.
• Create IPSec Connection. Consider following important points -
  Local Network - VPC CIDR
  Remote Network - Office Network CIDR
  Encryption Algorithm - aes192
• Download vpn configuration and share with network team. In mail, mention ports to be opened usually 22, 80, 443.
• Once the network team has configured the configuration on there end of  tunnel. Tunnel will be up in IPSec connection section.
• Update route table. Allow required port from the other end of the Tunnel NAT IP to allow the traffic to flow securely over the private tunnel.