Configuring Nat Mapping - Huawei quidway s7700 Configuration Manual

Quidway S7700 Smart Routing Switch
Configuration Guide - SPU
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Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
nat filter-mode { endpoint-dependent | endpoint-independent | endpoint-and-port-
dependent }
The NAT filtering mode is set.
NAT filtering is applied to the traffic from external network to internal network. The default
mode is endpoint-and-port-dependent. In this mode, when the system uses "source IP address
+source port+destination IP address+destination port+protocol number" as the index to search
the NAT mapping table.
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3.3.9 Configuring NAT Mapping

NAT mapping allows applications using the STUN, TURN, and ICE technologies to traverse
the NAT server.
Context
The network address translation (NAT) function saves IPv4 addresses and improves network
security. NAT mapping has the following modes:
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Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
nat mapping-mode endpoint-independent [ tcp | udp ] [ dest-port port-number ]
The NAT mapping mode is set.
Issue 01 (2011-07-15)
Address-dependent filtering
Address and port-dependent filtering
Endpoint-independent mapping: The NAT reuses the port mapping for subsequent packets
sent from the same internal IP address and port to any external IP address and port.
Address-dependent mapping: The NAT reuses the port mapping for subsequent packets
sent from the same internal IP address and port to the same external IP address, regardless
of the external port.
Address and port-dependent mapping: The NAT reuses the port mapping for subsequent
packets sent from the same internal IP address and port to the same external IP address and
port while the mapping is still active.
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