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Figure 11-14 NAT Example 1
Figure 11-15 Menu 4 — Internet Access & NAT Example
From menu 4 shown above, simply choose the
SUA Only
option from the
Network Address Translation
field. This is the Many-to-One mapping discussed in
section 11.1.5.
The
SUA Only
read-only option from
the
Network Address Translation
field in menus 4 and 11.3 is specifically pre-configured to handle this
case.
Menu 4 - Internet Access Setup
ISP's Name= ChangeMe
Encapsulation= Ethernet
Service Type= Standard
My Login= N/A
My Password= N/A
Login Server IP= N/A
IP Address Assignment= Dynamic
IP Address= N/A
IP Subnet Mask= N/A
Gateway IP Address= N/A
Network Address Translation= SUA Only
Press ENTER to Confirm or ESC to Cancel:
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NAT
11.4.2 Example 2: Internet Access with an Inside Server
Figure 11-16 NAT Example 2
In this case, you do exactly as above (use the convenient pre-configured
SUA Only
set) and also go to
menu 15.2 to specify the Inside Server behind the NAT as shown later.
11.4.3 Example 3: Multiple Public IP Addresses With Inside Servers
In this example, there are 3 IGAs from our ISP. There are many departments but two have their own FTP
server. All departments share the same router. The example will reserve one IGA for each department with
an FTP server and all departments use the other IGA. Map the FTP servers to the first two IGAs and the
other LAN traffic to the remaining IGA. Map the third IGA to an inside web server and mail server. Four
rules need to be configured, two bi-directional and two uni-directional as follows.
Rule 1.
Map the first IGA to the first inside FTP server for FTP traffic in both directions (
1 : 1
mapping, giving both local and global IP addresses).
Rule 2.
Map the second IGA to our second inside FTP server for FTP traffic in both directions (
1 : 1
mapping, giving both local and global IP addresses).
Rule 3.
Map the other outgoing LAN traffic to IGA3 (
Many : 1
mapping).
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Rule 4.
You also map your third IGA to the web server and mail server on the LAN. Type
Server
allows you to specify multiple servers, of different types, to other computers behind NAT on
the LAN.
The example situation looks somewhat like this:
Figure 11-17 NAT Example 3
In this case you need to configure Address Mapping Set 1 from
Menu 15.1 - Address Mapping Sets
.
Therefore you must choose the
Full Feature
option from the
Network Address Translation
field (in
menu 4 or menu 11.3) in
Figure 11-18
.
Step 1.
Then enter 15 from the main menu.
Step 2.
Enter 1 to configure the Address Mapping Sets.
Step 3.
Enter 1 to begin configuring this new set. Enter a Set Name, choose the
Edit
Action
and then
enter 1 for the
Select Rule
field. Press
[ENTER]
to confirm.
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NAT
Step 4.
Select
Type
as
One-to-One
(direct mapping for packets going both ways)
,
and enter the local
Start IP
as
192.168.1.10 (the IP address of FTP Server 1), the global
Start IP
as 10.132.50.1
(our first IGA). (See
Figure 11-19).
Step 5.
Repeat the previous step for rules 2 to 4 as outlined above.
Step 6.
When finished, menu 15.1.1 should look like as shown in
Figure 11-20.
Figure 11-18 Example 3: Menu 11.3
The following figure shows how to configure the first rule.
Menu 11.3 - Remote Node Network Layer Options
IP Address Assignment= Dynamic
IP Address= N/A
IP Subnet Mask= N/A
Gateway IP Addr= N/A
Network Address Translation= Full Feature
Metric= 1
Private= No
RIP Direction= None
Version= N/A
Enter here to CONFIRM or ESC to CANCEL:
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Figure 11-19 Example 3: Menu 15.1.1.1
Figure 11-20 Example 3: Final Menu 15.1.1
Now configure the IGA3 to map to our web server and mail server on the LAN.
Step 7.
Enter 15 from the main menu.
Step 8.
Now enter 2 from this menu and configure it as shown in
Figure 11-21
.
Menu 15.1.1.1 Address Mapping Rule
Type= One-to-One
Local IP:
End = N/A
Global IP:
Start= 10.132.50.1
End = N/A
Press ENTER to Confirm or ESC to Cancel:
Press Space Bar to Toggle.
Menu 15.1.1 - Address Mapping Rules
Set Name= Example3
Idx Local Start IP
Local End IP
Global Start IP Global End IP
Type
--- --------------- --------------- --------------- --------------- ------
10.132.50.1
1-1
10.132.50.2
1-1
3. 0.0.0.0
255.255.255.255 10.132.50.3
M-1
4.
10.132.50.3
Server
5.
6.
7.
8.
9.
10.
Action= Edit
Select Rule=
Press ENTER to Confirm or ESC to Cancel:
19216811.live