Asus RX3042H Bedienungsanleitung PDF herunterladen (Seite 75)

RX3042H User's Manual

Conﬁguring Firewall

9 Conﬁguring Firewall and NAT

The RX3042H provides built-in firewall/NAT functions, enabling

you to protect the system against denial of service (DoS) attacks

and other types of malicious accesses to your LAN while providing

Internet access sharing at the same time. You can also specify how

to monitor attempted attacks, and who should be automatically

notiﬁed.

This chapter describes how to create/modify/delete ACL (Access

Control List) rules to control the data passing through your network.

You will use ﬁrewall conﬁguration pages to:

• Conﬁgure ﬁrewall global and DoS settings

• Create, modify, delete and view ACL rules.

Note

: When you deﬁne an ACL rule, you instruct the RX3042H to

examine each data packet it receives to determine whether it meets

criteria set forth in the rule. The criteria can include the network or

internet protocol it is carrying, the direction in which it is traveling (for

example, from the LAN to the Internet or vice versa), the IP address

of the sending computer, the destination IP address, and other

characteristics of the packet data.

If the packet matches the criteria established in a rule, the packet

can either be accepted (forwarded towards its destination), or

denied (discarded), depending on the action speciﬁed in the rule.

9.1 Firewall Overview

9.1.1 Stateful Packet Inspection

The stateful packet inspection engine in the RX3042H maintains a

state table that is used to keep track of connection states of all the

packets passing through the ﬁrewall. The ﬁrewall will open a “hole”

to allow the packet to pass through if the state of the packet that

belongs to an already established connection matches the state

maintained by the stateful packet inspection engine. Otherwise,

the packet will be dropped. This “hole” will be closed when the

connection session terminates. No configuration is required for

stateful packet inspection; it is enabled by default when the ﬁrewall

is enabled. Please refer to section 9.3.1 “Firewall ” to enable or

disable ﬁrewall service on the RX3042H.

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Asus RX3042H Bedienungsanleitung Seite 75