Introduction to NAT
78
Models 2603, 2621, and 2635 User Manual
7
• Security
1.
Go to the “Security Interface Configuration” page by clicking on
Security
under Configuration in the
menu.
2.
Click on
Enable NAT to internal interfaces
in the Security Interfaces table. NAT is now enabled between
the internal (LAN) and the external (WAN) interfaces of the firewall.
Global address pool and reserved map
1.
Click on
Advanced NAT Configuration...
on the web page, “Security Interface Configuration.”
2.
Click on the hyperlink
Add Global Address Pool
... The global IP addresses need to be created and put into
the Global Address Pool.
3.
Set the parameters to the following values (See
figure 53
.):
– Interface Type: internal
– Use Subnet Configuration: Use IP Address Range
– IP Address: 100.100.100.101
– Subnet Mask/
IP Address 2
: 100.100.100.102
Click on
Add Global Address Pool
button.
Figure 53. NAT Global Address Pool configuration
4.
Next, create a reserved mapping between a global IP address from the global pool and a PC on the side of
the internal interface (’ip1’). In this example, 10.10.19.11.
5.
Click on the hyperlink
Add Reserved Mapping...
6.
Set the parameters to the following values (See
figure 54
.):
– Global IP Address: 100.100.100.101
– Internal IP address: 10.10.19.11
– Transport Type: all
– Port Number: 65535(This port number means all port numbers for TCP or UDP protocols will be
mapped.)
7.
Click on
Add Reserved Mapping
.
