The Basic Rule: Performing 1:1 Translations; Figure 8-8 Nat Rule: Add (Basic Flavor) - ZyXEL Communications Prestige 623 series User Manual

8.6.3 The Basic Rule: Performing 1:1 Translations

The basic flavor translates the private (LAN-side) IP address to a public (WAN-side) address, like napt
rules. However, unlike napt rules, basic rules do not also translate the port numbers in the packet header;
they are passed through un-translated. Therefore, the basic rule does not provide the same level of security
as the napt rule.
Step 1.
In the NAT Rule – Add page, type in a Rule ID, and select BASIC from the Rule Flavor drop-
down list menu.
Step 2. Select the interface and, if desired, a protocol that this rule applies to, as explained previously.
Step 3. In the Local Address From and Local Address To fields, type the starting and ending IP
addresses that identify the range of private addresses you want to be translated. Or type the
same address in both fields.
If you specify a range, each address will be translated in sequence to a corresponding address in
a range of global addresses (which you specify in step 4).
The address (or range of addresses) should correspond to a private address (or addresses)
already in use on your network These may be assigned statically to your computers, or assigned
dynamically using DHCP, as discussed in previous chapter on Configuring DHCP.
Step 4. In the Global Address From and Global Address To fields, type the starting and ending
address that identify the pool of public IP addresses to which to translate your private addresses.
Or, type the same address in both fields (if you also specified a single address in step 3).
Configuring Network Address Translation

Figure 8-8 NAT Rule: Add (BASIC flavor)

Prestige 623 Series Dual-link ADSL Router
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