User Manual

VisionNet 202ER ADSL Ethernet Router User’s Guide
68
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 untranslated. Therefore,
the basic rule does not provide the same level of security as the
napt rule.
Figure 28 shows the fields used for adding a basic rule.
Figure 28. NAT Rule – Add Page (basic Flavor)
Follow these instructions to add an basic rule (see steps 1-4 under
"The napt rule" on page 63 for specific instructions corresponding to
steps 1 and 2 below):
1. Display the NAT Rule – Add Page, select BASIC as the Rule
Flavor, and enter a Rule ID.
2. Select the interface on which this rule will be effective.
3. Select a protocol to which this rule applies, or choose ALL.
This selection specifies which type of Internet communication
will be subject to this translation rule. You can select ALL if the
rule applies to all data. Or, select TCP, UDP, ICMP, or a
number from 1-255 that represents the IANA-specified protocol
number.
4. In the Local Address From and Local Address 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.
Each address in the range will be translated in sequence to a
corresponding address in a range of global addresses (which
you specify in step 5).
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 5).