Forum Discussion
Question about connection Microsoft Teams behind Firewall NAT device use Single IP Address
- There is no limitation about concurrent connections behind a single IP address. What I believe that you are seeing is simple "not enough bandwidth" Screen sharing is one of the most network intensive things that you can do, and you see the results.
If you are looking at routers or other devices to measure the throughput, then be careful with what they are measuring. They are often measuring usage over a period of time, like 15 minutes, which isn't going to answer your needs.
Also, it is possible that it isn't your Internet connectivity alone, it could be the Fortigate or any other devices in the path.
Prepare your organization's network for Teams - Microsoft Teams | Microsoft Docs
May be this
"Validate the network address translation (NAT) pool size required for user connectivity. When multiple users and devices access Microsoft 365 or Office 365 using Network Address Translation (NAT) or Port Address Translation (PAT), you need to ensure that the devices hidden behind each publicly routable IP address do not exceed the supported number. Ensure that adequate public IP addresses are assigned to the NAT pools to prevent port exhaustion. Port exhaustion will contribute to internal users and devices being unable to connect to the Microsoft 365 or Office 365 service."
This is also a great blog by my friend Lee Ford to run through
Preparing Your Network for Microsoft Teams - Lee Ford's Blog (lee-ford.co.uk)
Hope that helps and works toward an answer
Best, Chris