[Q] LTE Dynamic NAT pool IPs

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Hi everyone, I have a problem where the LTE data rates have generally dropped and some applications (exchange email, VPN connections, etc) are unable to work properly when using an global IP from the firewall NAT pool. The NAT type is cone and there are many private IP addresses NAT to 30 global IP addresses.

When using statically allocated global IP (one per user), the speeds improve and all applications start to work properly instantly.

In your experience, how many global IPs do you assign in your network's firewall NAT pool?