Westermo MRD-3x0 - Manual (Page 73)

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The following options can be set for each custom filter:
Enabled
Set the Enabled check box to have the rule installed in the
firewall. A rule can be temporarily disabled by unchecking this
box.
Apply to
Custom filters can be applied at three separate points in the
unit:
Forwarded packets. •
The filter will be applied to packets that are received
from one network interface and then routed out
another network interface
Locally destined packets.
•
The filter will be applied to packets destined for the
unit's internal services.
Locally generated packets.
•
The filter will be applied to packets generated by one
of the unit's internal services.
Incoming interface
If selected, packets will be matched based on the network
interface they have been received on. Note that this can't be
applied to Locally generated packets as they have been gener-
ated by the unit itself.
Outgoing interface
If selected, packets will be matched based on the network
interface they will be transmitted on. Note that this can't be
applied to Locally destined packets as they will be received by
the unit itself.
Protocol
If selected, packets will be matched based on their protocol
type. Note that if you wish to match on source or destination
ports, the protocol must be set to TCP or UDP.