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Chapter 7
Translation
7.1
Overview
Public IP addresses are registered and can be used within a public network,
such as the Internet. Due to the limitation of IP version4 address space and the
growth of the Internet, the public addresses are becoming more scarce. One
solution to this problem is to use private addresses in the small LANs and to
use Address Translation when accessing the CT-510 on a public network. Both
Port Address Translation (PAT) and Network Address Translation (NAT) are
supported by the CT-510.
1. If the PAT/NAT function is required, refer to Section 7.2 to enable the
PAT/NAT function. Thus, all the hosts in the virtual LAN will transmit
data by means of the PAT across the WAN IP addresses.
2. To set up a server that can be accessed by the Internet users, such
as a SMTP server, Web server, and FTP server, refer to Section 7.3.
3. To further map the private IP addresses in the virtual LAN on to the
specified global IP addresses, refer to Section 7.4.
7.2
Enable PAT/NAT
Step 1
Enter the MAIN/QC/LAN menu.
Step 2
Select Virtual in the Network Type field.
Step 3
Hold down the Ctrl-S keys.
Step 4
Enter the MAIN/CONF/SYSTEM menu.
Step 5
Select Router in the Operation Mode field.
Step 6
Hold down the Ctrl-S keys.
Network & Port Address
36
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