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2.11.3.2. Virtual Server Mappings
Fig. 63. Virtual server mappings.
The gateway enables you to expose internal servers on the intranet through NAT to the Internet for
public use. The exposed internal servers are called virtual servers because from perspective of hosts
on the Internet, these servers are invisible in terms of TCP/IP.
To expose “preset” internal servers:
1. Select the corresponding Enabled check boxes for the kinds of servers (FTP, IMAP4, SMTP,
POP3, TELNET, and HTTP) you want to expose.
2. Specify the private IP addresses of the internal servers.
To expose other internal servers:
1. Specify the Service Name, Private IP Address, Port Number, and whether the service is
TCP-based or UDP-based for a non-preset internal server you want to expose.
2. Select the corresponding Enabled check box for the internal server.
3. Repeat Steps 1 to 2 for other non-preset internal servers.
2.11.4. DHCP Server
2.11.4.1. Functionality
There are three mode of DHCP Server to be defined in ‘Functionality’: Disable, DHCP Server , and
DHCP Relay.