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Chapter 5 Network Tab
DMZ Check the Enable box to use the DMZ function. DMZ (Demilitarized Zone)
specifically allows one computer/device behind NAT to become
“demilitarized”, so all packets from the external network are forwarded to this
computer/device. The demilitarized host is exposed to the wide area network,
which can realize the unlimited bidirectional communication between internal
hosts and external hosts.
DMZ IP
Specify the IP address of the local host network device. The DMZ host device
will be completely exposed to the external network. Any PC that was used for a
DMZ must have a static or reserved IP Address because its IP Address may
change when using the DHCP function.
ALG
Common NAT only translates the address of packets at network layer and the
port number at transport layer but cannot deal with the packets with
embedded source/destination information in the application layer. Application
layer gateway (ALG) can deal with protocols with embedded
source/destinati
on information in the application payload. Some protocols
such as FTP, TFTP, H323 and RTSP require ALG (Application Layer Gateway)
support to pass through NAT.
FTP ALG - Allows FTP clients and servers to transfer data across NAT.
TFTP ALG - Allows TFTP clients and servers to transfer data across NAT.
H323 ALG - Allows Microsoft NetMeeting clients to communicate across
NAT.
RTSP ALG - Allows some media player clients to communicate with some
streaming media servers across NAT.
Virtual Server Check the Enable box to use the virtual server function. Virtual servers can be
used for setting up public services on your local area network, such as DNS,
Email and FTP. A virtual server is defined as a service port, and all requests from
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