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Figure 67:

Add NAT/NAPT Rule

2.

Follow the example to create the required NAT/NAPT rules.

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Example 1: Translate the address 192.168.1.10 to 192.168.71.12

In this example, we assume that LAN addresses (192.168.1.X) are not yet connected. Therefore, they do not

appear as drop-down menu options, and network objects must be created in order to represent them.

1

.

Select

User Defined

in the

Source Address

drop-down menu. The

Edit Network Object

screen appears.

Figure 68:

Edit Network Object

2

.

Click

New Entry

. The

Edit Item

screen appears.

Figure 69:

Edit Item

3

.

In the

Network Object Type

drop-down menu, select

IP Address

, and then enter 192.168.1.10.

4

.

Click

OK

to save the settings.

5

.

Click

OK

once more in the

Edit Network Object

screen.

6

.

Back in the

Add NAT/NAPT Rule

screen, in the

NAT Addresses

drop-down menu, select the

192.168.71.12

option. The screen refreshes, adding this address as a NAT IP address.

7

.

Click

OK

to save the settings. The NAT rule is displayed in the

NAT

screen.

Figure 70: NAT/NAPT Rule Sets

This rule translates one LAN IP address to one NAT IP address which means that this LAN computer will have

WAN access at all times. The status is therefore set to "Active".

Example 2: Translate the range 192.168.1.11-192.168.1.15 to 192.168.71.12-192.168.71.15

Define this NAT rule in the same manner depicted above with the exception of selecting

IP Range

(instead of

IP Address

) as the network object type. Since neither range is predefined (and therefore not found in the

drop-down menu options), network objects must be created in order to represent them. This is done with the

User Defined

option. The rule is displayed in the

NAT

screen.

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Figure 71: NAT/NAPT Rule Sets

This rule translates five new LAN IP addresses to four NAT IP addresses, which would normally mean that only

four of the five LAN computers may have WAN access at the same time. However, note that the NAT address

192.168.71.12 is already in use by the first rule. The L13 will therefore allow these five LAN computers to use

only the three remaining IP addresses: 71.13, 71.14 and 71.15. The status is set to "Active".

Example 3: Translate the range 192.168.1.21-192.168.1.25 to 192.168.71.13-192.168.71.14

1

.

Define this NAT rule in the same manner depicted above. The following attention message is displayed.

Figure 72: Attention

2

.

Click

OK

. The rule is displayed in the

NAT

screen.

Figure 73: NAT/NAPT Rule Sets

This rule translates five new LAN IP addresses to two NAT IP addresses, both of which are already in use by

the second rule. L13 is therefore unable to resolve this situation and the rule's status is set to "Error". Notice

that had this rule been defined as the second rule, all three rules would be valid. This is because the NAT

address 192.168.71.15 would still be available for rule number 1. This can easily be amended: You can use the

green arrow icons to move a rule entry up or down, changing its priority relative to the other rules. Click this

rule's

action icon once. All rules will now be set to "Active".

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Figure 74 NAT/NAPT Rule Sets

Note

: Rule number 1 now maps five LAN addresses to one NAT address. L13 subtracts all previously used NAT

addresses, requested by previous rules, from the requested NAT addresses of the current rule. The requested

range of addresses does not determine how many will be available; the number of available addresses is

determined by the previous rules configuration and order. Rules will appear as "Active" even if they only have

one usable NAT address.

Example 4: Translate the address 192.168.1.5 to 192.168.71.16 to

ports 1024-1050

1

.

Define this NAPT rule in the same manner depicted above, with the following exception:

Select the

NAPT

option in the

Operation

section drop-down menu. The screen refreshes.

Figure 75: Add NAPT Rule

2

.

Add a NAPT address by selecting the

User Defined

option.

3

.

Enter 1024-1050 as the range of ports in the

NAPT Ports

section.

4

.

Click

OK

to save the settings. The rule is displayed in the

NAT

screen.

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Figure 76: NAT/NAPT Rule Sets

This rule translates a LAN IP address to a NAT IP address with specific ports. Its status is set to "Active".

3.7.1.9

Connections (Firewall)

The connection list displays all the connections that are currently open, as well as various details and statistics. You

can set this list to close an undesired connection by clicking its

action icon. The basic display includes the name of

the protocol, the different ports it uses, and the direction in which the connection was initiated.

Figure 77: Connection List

Click

the

Advanced

button to display the following details:

The connection's time-to-live

The number of kilobytes and packets received and transmitted

The device type

The routing mode

Use the

Connections per Page

combo box to select the number of connections to display at once.

The

“Approximate Max. Connections”

value represents the number of additional concurrent connections possible.