Asus iPBX30, User Manual, Page: 79 / 160

Chapter 9 iPBX30 User Manual
66
9.2.2 Reverse NAPT / Virtual Server
Reverse NAPT is also called inbound mapping, port mapping, or
virtual server. Any packet coming to the iPBX30 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. 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
The table below 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, iPBX30 will not respond to remote peer’s
attempt to connect to the closed TCP/UDP ports.
To configure firewall settings, follow the instructions below:
1. Click on Firewall/NAT ->Settings menu to open the Firewall
Settings configuration page.
2. Check or uncheck individual check box for each firewall option.
3. Click Apply to save the settings.