The system view is displayed.
Step 2 Run:
interface interface-type interface-number
The interface view is displayed.
Step 3 Run:
l nat static protocol { tcp | udp } global { global-address | current-interface } global-
port inside host-address [ host-port ] [ vpn-instance vpn-instance-name ] [ netmask
mask ] [ acl acl-number ] [ description description ]
l nat static protocol { tcp | udp } global interface loopback interface-number global-port
[ vpn-instance vpn-instance-name ]inside host-address [ host-port ] [ vpn-instance vpn-
instance-name ] [ netmask mask ] [ acl acl-number ] [ description description ]
l nat static [ protocol { protocol-number | icmp | tcp | udp } ] global global-address
inside host-address [ vpn-instance vpn-instance-name ] [ netmask mask ] [ acl acl-
number ] [ description description ]
Static NAT is configured.
NOTE
When configuring static NAT, ensure that global-address and host-address are different from interface IP
addresses and IP addresses in the user address pool.
----End
5.3.7 Enabling NAT ALG
Errors may occur when NAT translates protocol packets encapsulated in IP data packets. The
NAT ALG function ensures that the protocol packets are translated successfully.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
nat alg { all | dns | ftp | rtsp | sip } enable
The NAT ALG function is enabled.
After the NAT ALG function is enabled for an application protocol, packets of the application
protocol can traverse the NAT server. The application protocol cannot work without the NAT
ALG function.
In the command, all indicates that NAT traversal applies to the DNS, FTP, SIP, and RTSP
protocols.
----End
5.3.8 Configuring NAT Filtering
A NAT device filters the traffic from external network to internal network. After an internal host
sends an access request to an external host, the external host transmits traffic to the internal host.
The NAT device filters the traffic sent to the internal host.
Huawei AR150&200 Series Enterprise Routers
Configuration Guide - IP Service 5 NAT Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
113
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