Network access translation is mechanism which allows hide local machines from outside and grant to local machines access to otside resources.

To start NAT on vibr1 interface use commands:

iptables -A FORWARD -i vibr1 -o primary -j ACCEPT
iptables -t nat -A POSTROUTING -o primary -j MASQUERADE

To get iptables rules list use command:

iptables -L

To clean up iptables rules list use command:

iptables -F