Netmap & Log

Hi,

i have a RouterOS 4.6, and everything works.
The router performs several functions, such as firewalls, reverse nat, log traffic, forwarding dns, netmap;
The current log is directed to a syslog server.
I need to trace the source ip association with the public ip.
I think this association is variable, because the clients are configured as DHCP client.

I can not find any documentation on how to configure the source IP logging association with public ip.
Can you help me to create this configuration?

I’m sorry for my English, and I thank you in advance

D.