ROS NAT table

RouterOS General
1

Hey guys, I have 2 questions regarding NAT table.

  1. Theoretically how many connections can handle IPv4 NAT table? (Not about only ROS)
  2. How many connections can handle ROS NAT table? If it depends on hardware memory, how many connections can handle RB1100AHx2

I have found below topic. But I think this is not correct. /ip firewall connection tracking max-entries: 524288 is a not only for NAT, it is the max value for total IP connections. Right?

http://forum.mikrotik.com/t/nat-table-size/14192/1

2

entry count highly depends on RAM amount available - more ram, more connections. If you enable IPv6 - that will eat huge amount of available entry count.

To check how many you have on a router you can open in Winbox - IP->Firewall->connections and that field Max Entries, is what is limiting you. If no new entries can be added, NAT will not know about that connection.

3

Janisk, I have another question. Without NAT, how many TCP, UDP connection can be handled by ROS? Also what will if conn-track is off?