Dynalink RTA100+, Руководство пользователя

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ADSL Bridge/Router User's Manual
54
packet header; they are passed through untranslated. Therefore,
the basic rule does not provide the same level of security as the
napt rule.
The figure below shows the fields used for adding a basic rule.
1. Display the NAT Rule – Add Page, choose a Rule ID, and
select BASIC as the Rule Flavor.
2. Select the interface and, if desired, a protocol that this rule
applies to.
3. In the Local Address From / To fields, type the starting and
ending IP addresses that identify the range of private
address 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).
4. In the Global Address From / 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).
The filter rule: Configuring a basic rule with additional criteria
Like the basic flavor, the filter flavor translates public and private
IP addresses on a one-to-one basis. The filter flavor extends the
capability of the basic rule.
You can use the filter rule if you want an address translation to
occur only when your LAN computers initiate access to specific
destinations. The destinations can be identified by their IP
addresses, server type (such as FTP or Web server), or both.