Planet VDR-301n User Manual page 69

LAN Setting
LAN IP Address
5.4.2.3 ALG
An application layer gateway (ALG) is a feature that enables the gateway to parse application layer payloads and
take decisions on them. ALG is typically employed to support applications that use the application layer payload
to communicate the dynamic Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) ports on
which the applications open data connections. Such applications include the File Transfer Protocol (FTP) and
various IP telephony protocols.
5.4.2.4 NAT Exclude IP
NAT improves network security in effect by hiding the private network behind one global and visible IP address.
NAT address mapping can also be used to link two IP domains via a LAN-to-LAN connection. Network Address
Translation (NAT) is the method by which the Router shares the single IP address assigned by your ISP with the
other computers on your network. This function should only be used if your ISP assigns you multiple IP addresses
or you need NAT disabled for an advanced system configuration. If you have a single IP address and you turn
NAT off, the computers on your network will not be able to access the Internet. Other problems may also occur.
Turning off NAT will disable your firewall functions.
You can choose IP Address, Hostname or MAC Address.
Enter the IP address of the virtual server. It is in the same network
segment with LAN IP address of the router.
Figure 5-47 ALG
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User Manual of VDR-301N