Nat; Virtual Servers - Iskratel Innbox V50-U Management Manual

NAT

• Leased Time (hour): The Leased Time is the amount of time in which a network user will be
allowed connection to the device with their current dynamic IP address. Enter the amount of time,
in hours, then the user will be "leased" this dynamic IP address. After the dynamic IP address has
expired, the user will be automatically assigned a new dynamic IP address. The default is 24
hours.

Static IP Lease List: The function allows you to specify a reserved IP address for a PC on the LAN,
that PC will always obtain the assigned IP address each time when it accesses the DHCP server.
Reserved IP addresses should be assigned to servers that require permanent IP settings. Click Add
Entries, to reserve the MAC address and IP address you want to reserved.

Configure the second IP Address and Subnet Mask: Configure the device second IP Address and
Subnet Mask for LAN Interface through which you can also access to the Web-based Utility as the
default IP Address and Subnet Mask.
Note: UPnP, DHCP Server and the second IP Address are not available for the
connection type of Bridging. They will not display on the preceding page since only
Bridging is selected.
3.2.4 NAT
Network Address Translation (NAT) implements the translation of network addresses and ports. The
implementation also supports NAT plus. Support for additional services is enabled, e.g., H.323, Video &
Audio on Demand, which use a more complicated server-client communication scheme.
The following NAT features can be configured:

"Virtual Servers"

"Port Triggering"

"DMZ Host"
3.2.4.1

Virtual Servers

Virtual servers can be used for setting up public services on your LAN, such as DNS, Email and FTP. A
virtual server is defined as a service port, and all requests from the Internet to this service port will be
redirected to the computer specified by the server IP. Any PC that was used for a virtual server must have
a static or reserved IP Address because its IP Address may change when using the DHCP function.
Select Advanced Setup > NAT > Virtual Servers. The following page opens:
Virtual Server Table indicates the information about the Virtual Server entries:

Server Name: The name of the virtual server. It is exclusive and must be filled in.

External Port Start: The base number of external ports. You can type a service port or leave it blank.

External Port End: The end number of external ports. You can type a service port or leave it blank.

Protocol: The protocol used for this application, TCP, UDP, or TCP/UDP.
Figure 3-16: Virtual Servers
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