Symptom:
Static network nat config command for with mask /32 disappears
from running config after packets pass through it.
NAT still works after this.
Conditions:
This happens for static network nat config command for with mask /32. like
ip nat inside source static network 10.10.10.10 192.168.1.1 /32
Workaround:
Configure equivalent non-network static nat entry, like
ip nat inside source static 10.10.10.10 192.168.1.1
Further Problem Description:
Problem is not present in 12.2 and 12.3 mainline trains.