For first, the communication rules are listed here with the directions and operation of the
communication rules.
Here, you can see and modify the general rules of the communication, at the
Input
(incoming),
Output
(outgoing) and
Forward
operations one by one by
accept
it, or
reject
,
drop.
You can
Delete
the settings or
modify.
At the
Zones
part you can
a new rule to the current ones. You also can
or
an existed rule.
When you are attmepted to add a new firewall rule, it must be performed very carefully, because
you can disable or tilt ports communication which are used by the router or some network services
by general (e.g. Port nr. 67 is necessary for the DHCP service and 80 port for the, port nr. 52 for
DNS, port nr. 1194 for OpenVPN, etc).
