Information
The ipforwarding parameter determines whether or not the system forwards TCP/IP packets.
The ipforwarding parameter will be set to 0 to ensure that redirected packets do not reach remote networks. This should only be enabled if the system is performing the function of an IP router. This is typically handled by a dedicated network device.
Solution
In /etc/tunables/nextboot add the ipforwarding entry:
no -p -o ipforwarding=0
This makes the change permanent by adding the entry into /etc/tunables/nextboot