server, and 61.16.33.116 for their public POP3 server. And the administrator has registered with In-
terNIC (Internet Network Information Center) some domain name-to-IP address map-
pings—www.abc.com to 61.16.33.115 and pop3.abc.com to 61.16.33.116. However, the public Web
server and POP3 server for ABC Technology sit on the intranet and use private IP addresses,
192.168.0.2 and 192.168.0.3, respectively. To expose the servers in this situation, the network admin-
istrator needs two static NAT mappings to associate 61.16.33.115 with 192.168.0.2 and 61.16.33.116
with 192.168.0.3.
To associate a public IP address with a private IP address:
1.
Specify the public IP address and the private IP address for the association.
2.
Select the corresponding
Enabled
check box.
3.4.3.3. Virtual Server Mappings
Fig. 56. 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. A server connection request from the
Internet with a port within the specified
WAN port range
will be routed to the corresponding port
within the specified
LAN port range
of the server on the intranet.
To expose an internal servers:
1.
Give the service you want to expose a name in the
Service name
text box.
2. Specify
the
Private IP address
of the internal servers.
3. Choose
the
Protocol type
of the service.
4. Specify
the
WAN
Interface
that accepts this type of server connection requests.
5. Specify
the
LAN port range
for the mapping by entering the
From
port and
End
port, inclu-
sively.
6. Specify
the
WAN port range
for the mapping by entering the
From
port and
End
port, inclu-
sively.
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