User`s manual

RX3042H User's Manual

Conﬁguring Firewall

9.2.2 Reverse NAPT / Virtual Server

Reverse NAPT is also called inbound mapping, port mapping, or

virtual server. Any packet coming to the RX3042H can be relayed

to the internal host based on the protocol, port number and/or IP

address specified in the ACL rule. This is useful when multiple

services are hosted on different internal hosts. Figure 9.2shows that

web server (TCP/80) is hosted on PC A, telnet server (TCP/23) on

PC B, DNS server (UDP/53) on PC C and FTP server (TCP/21) on

PC D. This means that the inbound trafﬁc of these four services will

be directed to respective host hosting these services.

9.3 Firewall Settings – (Firewall/NAT ->Settings)

9.3.1 Firewall Options

Table 9.1 lists the ﬁrewall options parameters.

Table 9.1. Firewall Options Parameters

Field Description

DoS Check

Check or uncheck this box to enable or disable DoS

check. When DoS check is disabled, the following

functionalities are disabled:

• Stateful packet inspection

• Skip all DoS attack check

Default NAT

Log Port Probing

Connection attempt to closed ports will be logged if

this option is enabled.

Stealth Mode

If enabled, RX3042H will not respond to remote peerʼs

attempt to connect to the closed TCP/UDP ports.

To conﬁgure ﬁrewall settings, follow the instructions below:

1. Open the

Firewall Settings

configuration page as shown in

Figure 9.3 by clicking on

Firewall/NAT ->Settings

menu.

2. Check or uncheck individual check box for each ﬁrewall option.

3. Click

Apply

to save the settings.

9.3.2 DoS Conﬁguration