Vyatta Network OS Documentation

Learn how to install, configure and operate the Vyatta NOS, which helps drive our virtual networking & physical platforms portfolio.

Traffic flow through firewall, NAT, and routing

For example, if you are using DNAT, you should take care not to set up the system to route packets based on particular external addresses. This routing method would not have the expected result because the addresses of external packets would have all been changed to internal addresses by DNAT before routing.

The following figure shows the traffic flow between NAT, routing, and firewall within the vRouter.

Figure 1. Traffic flow through the vRouter