anonymous user Thanky ou for reaching out to Microsoft Q&A.
I understand that you want to enable multiple VPN connections from your on-premise to Azure Vnet to increase the VPN BW.
This is possible if you have an additional Public IP on your on-premise which can be used as another local gateway and setup another VPN using that Public IP between your on-premise and Azure. Then you can advertise the same networks over this VPN using BGP and do ECMP as well. This should then route traffic through all the four tunnels. Hope this helps.
Please let us know if you have any further questions and we will be glad to assist you further. Thank you!
Remember:
Please accept an answer if correct. Original posters help the community find answers faster by identifying the correct answer. Here is how.
Want a reminder to come back and check responses? Here is how to subscribe to a notification.