Reverse Napt / Virtual Server; Firewall Settings - (Firewall/Nat ->Settings); Firewall Options; Dos Configuration - Asus RX3042H User Manual

RX3042H User's Manual

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
DoS Check
Default NAT
Log Port Probing Connection attempt to closed ports will be logged if
Stealth Mode
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
Description
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
this option is enabled.
If enabled, RX3042H will not respond to remote peerʼs
attempt to connect to the closed TCP/UDP ports.
Configuring Firewall
67