Hi, does anyone knows wich is the limit of maximum concurrent connections, in terms of connections and mbps. I need to NAT thousands of private ip´s, and my cisco ASA 5520 is getting full of connections, actually supports 280000 and is touching the upper limit. My thoughts, is that is only limited by hardware, but I will be glad about an official answer.
Max number of connections in RouterOS is limited to amount of memory and you can see it in the bottom of connection tracking window.
My RB433AH have max Entries: 221600
My x86 with 768Mb RAM - max Entries: 524288
Connection is nothing more than a entry in conntrack table for RouterOS, but bigger the table slowed the lookup - more load on CPU.
So only limitation in ROuterOS is RAM and CPU, if both can handle the load, then you should be fine.
Sorry, each situation is specific so we can’t give you throughput numbers, but considering that you can go for 12Core CPU and 1,5Gb max RAM 