WANGUARD 5.2 User Manual & Administrator's Guide
opton makes the Filter consume less CPU, because the malicious packets that are dropped do not
reach the Outbound Interface. The disadvantage of this opton is that the Filter will not record
trafc statstcs for the dropped trafc
●
Outbound Interface
This feld is optonal if the Monitor Interface is set to “Inbound”. The cleaned trafc is sent to a
downstream router through this network interface. The gateway must be reachable through this
interface.
If GRE or IP over IP tunneling is being used, then you must frstly confgure a virtual network interface
with the
ip
command, part of the
iproute2
package.
●
SW Filtering Policy
The Sofware Filtering Policy lets you select which sofware flters will be applied when the Filter detects
an atack patern. An atack patern is formed by malicious packets that share some common OSI Layer
3, OSI Layer 4 or OSI Layer 5 felds. When an atack comes from a non-spoofed IP address, the atack
patern is the source IP address of the atacker. In case of a spoofed atack, the atack patern could be
the source TCP or UDP port, the destnaton TCP or UDP port, IP protocol number, packets size, TTL etc.
The Filter does inbound sofware-based trafc fltering and packet rate limitng using the Netilter
framework.
Available Filtering Policies are:
○
No sofware fltering –
The Filter detects and reports atack paterns. The Linux frewall API is not
used, but you can implement other fltering commands using Responses Actons
○
Filter the atack paterns and forward valid trafc –
The Filter detects, reports and flters atack
paterns. If an atack patern is not whitelisted, then the whole trafc matched by the atack patern
is dropped. The rest of the trafc is forwarded through the Outbound Interface
○
Filter the atack paterns and forward limited valid trafc –
The Filter detects, reports and flters the
atack paterns and forwards rate-limited valid trafc. If an atack patern is not whitelisted, then
the whole trafc matched by the atack patern is dropped. The Filter system will not forward trafc
that exceeds the anomaly's trafc type packets/second threshold value
○
Limit the atack paterns and forward valid trafc –
The Filter detects, reports and rate-limits the
atack paterns to the threshold values. The Filter only forwards atack paterns trafc that does not
exceed the anomaly's trafc type packets/second threshold value for the atacked IP address
○
Apply default FORWARDING policy –
The Filter detects and reports the atack paterns, and the
default forwarding policy is applied. Netilter is stll being used, but all the rules have the “RETURN”
target. This is used only mainly when debugging Netilter rules
○
Filter the atack paterns and accept valid local trafc –
The Filter detects, reports and flters the
atack paterns. If an atack patern is not whitelisted, then the whole trafc matched by the atack
patern is dropped. The rest of the trafc is accepted towards the Inbound Interface
○
Filter the atack paterns and accept limited local valid trafc
– The Filter detects, reports and flters
the atack paterns and accepts rate-limited local valid trafc. If an atack patern is not whitelisted,
then the whole trafc matched by the atack patern is dropped. The Filter system will not accept
trafc that exceeds the anomaly's trafc type packets/second threshold value for the atacked IP
address
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