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Router firewall
The Router firewall page is used to enable or disable the in-built firewall on the router. When enabled, the firewall
performs stateful packet inspection on inbound traffic from the wireless WAN and blocks all unknown services, that
is, all services not listed on the Services configuration page of the router.
With respect to the other Routing options on the Networking page, the firewall takes a low priority. The priority of
the firewall can be described as:
DMZ > MAC/IP/Port filtering rules > MAC/IP/Port filtering default rule > Router firewall rules
In other words, the firewall is of the lowest priority when compared to other manual routing configurations.
Therefore, a MAC/IP/Port filtering rule takes priority in the event that there is a conflict of rules. When DMZ is
enabled, MAC/IP/Port filtering rules and the router firewall are ignored but the router will still honour the
configuration of the Remote router access control settings listed under Administration Settings.
MAC / IP / Port filtering
The MAC/IP/Port filter feature allows you apply a policy to the traffic that passes through the router, both inbound
and outbound, so that network access can be controlled. When the filter is enabled with a default rule of
"Accepted", all connections will be allowed except those listed in the "Current MAC / IP / Port filtering rules in
effect" list. Conversely, when the default rule is set to "Dropped", all connections are denied except for those
listed in the filtering rules list.
Important – When enabling MAC / IP / Port filtering and setting the default rule to "Dropped", you should ensure that you have first added
a filtering rule which allows at least one known MAC/IP to access the router, otherwise you will not be able to access the user interface of
the router without resetting the router to factory default settings.
NWL-25 – 4G LTE Light Industrial M2M Router – User Guide
UG01033 v1.1 June 2018
Figure 52 - Router firewall toggle key
Figure 53 - MAC / IP / Port filtering
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© NetComm Wireless 2018
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