Westermo MRD-3x0 - Manual (Page 74)

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Source address
If selected, either a single address (for example, 172.16.1.132)
or a subnet range (for example, 172.16.0.0/24) can be entered.
Only packets matching this source address will have the filter
applied to them.
Source port or range
If selected, packets will be matched based on their TCP or
UDP source port. Either an individual port (for example, 443)
or a range of ports (80-143) can be entered.
Destination address
Similar to the Source address, but instead matching on the
destination address.
Destination port or range
Similar to the Source port or range, but instead matching on
the destination port.
Action
Determines what action on packets who meet all of the
matching criteria for the filter. If set to Deny, the packet will
be dropped. If set to allow, the packet will be passed.
Insert this entry at position
Determines where this entry will be inserted in the list of
custom filters.