In the previous section, we discussed port mapping to allow internal network devices (e.g. servers) to be accessible from the Internet. The Vigor router actually supports three variants of port mapping methods, as follows :
When using combinations of these three systems, there is a priority structure; i.e. if a rule in one method co-incides with a rule in another method, then there is strict precidence, so that the result should be predictable. The precidence is as follows :
Port Redirection > Open Ports > DMZ
For example, if an incoming packet's port number matches a rule in both 'Port Redirection' and 'Open Ports' then the packet will be forwarded onto the local address defined in 'Port Redirection'.
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