3Com 3C13636 Configuration Manual page 520

3Com Router 3000 Ethernet Family
Configuration Guide
Suppose that you directly take the interface address as the public network address
after NAT. If you change the interface address in order to visit the external network, you
must use the reset nat session command to clear the original NAT address mapping
entry, otherwise, the NAT entry can neither be deleted automatically, nor be deleted by
the command reset nat.
II. Using the IP address of a loopback interface for address translation
Perform the following configuration in interface view.
Table 11-3 Use the IP address of a loopback interface for address translation
Associate an ACL with a Loopback
interface
Remove the association of the ACL to
the loopback interface
The IP address of the specified loopback interface is used to substitute for the source
addresses of the packets matching the ACL.
III. Configuring static NAT
1) Configure a one-to-one static NAT entry
Perform the following configuration in system view.
Table 11-4 Configure a one-to-one static NAT entry
Configure
private-to-public NAT entry
Delete an existing static one-to-one
private-to-public NAT entry
2) Configure static net-to-net NAT
In comparison to conventional static NAT, static net-to-net NAT only involves the net ID
portion of the IP address. The host ID portion remains unchanged after address
translation.
Perform the following configuration in system view.
Operation
Operation
a static one-to-one
3Com Corporation
11-9
Chapter 11 NAT Configuration
Command
nat outbound acl-number interface
interface-type interface-number
undo nat outbound
interface
interface-number
Command
nat static ip-addr1 ip-addr2
undo nat static ip-addr1 ip-addr2
acl-number
interface-type