Huawei EchoLife HG520 User Manual page 43

NAPT (Network Address and Port Translation) is an extension to
basic NAT, in that many network addresses and their TCP/UDP ports
are translated to a single network address and its TCP/UDP ports.
Please be noted that this feature works only when the PVC with NAT
feature is activated.
Figure 4-16 NAT- NAPT Settings
REDIRECT refers to redirect the packets. Servers redirect
packets to the configured internal IP addresses and ports according to
the IP addresses and TCP/UDP port range of which the packets are
coming from. This feature only works when the PVC settings of NAT
feature are configured.
Single click REDIRECT button as shown in Figure 4-17 and you
will be prompted to the REDIRECT setting page as shown in Figure
4-18.
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