How to calculate NAT load on Cisco 5510?

Question

Cisco

Good afternoon everyone.
I lost my way)
There are input data:
- Internet channel 1 Gigabit
- on average 300, rarely can reach 1000 WiFi users, limit of 5 megabits per user, configured for WiFi
I want to buy Cisco 5510 for NAT, only NAT no filters.
How to calculate whether Cisco can handle the load or not?
What parameters to look at when selecting equipment, can you pick up some kind of analogue on MikroTik?

Answer 1

- Internet channel 1 Gigabit
- on average 300, rarely can reach up to 1000 WiFi users, limited to 5 megabits per user

you already have problems. 300 * 5mbit = 1.5 Gbit
You need either a wider channel, or more restrictive, or adjust QoS, and this is additional. CPU load (other than NAT).
The vendor (for sure, the cisco) has, as a rule, data on throughput (UDP, MiX, 64b packet, etc) depending on the enabled functionality (Filter, NAT, QoS, IPsec, etc).
It will also depend on the rules you have configured, but if only NAT, I think it is unlikely that you will have a large list of them there, which will still load the hardware.
To summarize: look at the channel, it is small. Either the channel is wider, or cut users (QoS or less than 5Mbps). Find, request from the vendor a performance table for selected models.