Westermo MRD-3x0 - Manual (Page 69)

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5.3 DoS Filters
A denial of service attack (DoS attack) is an attempt to
render a network device unavailable to intended users. The
most common method of attack involves saturating the target
device with external communications requests, such that it
cannot respond to legitimate traffic, or responds so slowly as
to be rendered effectively unavailable. The intention of DOS
attacks is to cause the targeted device to reset or consume
resources to such a level that it is unable to provide the
intended service. A consequence of such an attack is that even
if the device is able to handle the large number of communica-
tions requests, the bandwidth over the communications chan-
nel used for the attack may be completely consumed, poten-
tially preventing legitimate connections to the targeted device.
The firewall has filters that can detect and drop packets that
may be part of a Denial of Service (DOS) attack, for example,
TCP packets with invalid header information. Options to ena-
ble and disable these filters can be found on DoS Filters page.