Cisco NAT Syslog configuration

For IPDR Flow logging the recommended method is NetFlow/IPFIX. However for some devices logging the NAT translations via SYSLOG can be preferable.

To log NAT translations upon create and delete via syslog. Use the following command 1)

Say you have a SYSLOG server listening on the default port UDP/514 at 10.10.200.200 use this command. 

logging on
logging trap informational
logging host 10.10.200.200 
ip nat log translations syslog
1)
Monitoring and Maintaining NAT Cisco Documentation https://www.cisco.com/en/US/docs/ios-xml/ios/ipaddr_nat/configuration/15-0s/iadnat-monmain.html