address (the inside global address) back to the inside local address before forwarding it to the
original inside host. Note that the IP address (either local or global) of an outside host is never
changed.
The global IP addresses for the inside hosts can be either static or dynamically assigned by the
ISP. In addition, you can designate servers, for example, a web server and a Telnet server, on
your local network and make them accessible to the outside world. If you do not define any
servers, NAT offers the additional benefit of firewall protection. With no servers defined, your
LTE Device filters out all incoming inquiries, thus preventing intruders from probing your
network. For more information on IP address translation, refer to
RFC 1631
,
The IP Network
Address Translator (NAT)
.
8.6.3 How NAT Works
Each packet has two addresses-a source address and a destination address. For outgoing
packets, the ILA (Inside Local Address) is the source address on the LAN, and the IGA
(Inside Global Address) is the source address on the WAN. For incoming packets, the ILA is
the destination address on the LAN, and the IGA is the destination address on the WAN. NAT
maps private (local) IP addresses to globally unique ones required for communication with
hosts on other networks. It replaces the original IP source address (and TCP or UDP source
port numbers for Many-to-One and Many-to-Many Overload NAT mapping) in each packet
and then forwards it to the Internet. The LTE Device keeps track of the original addresses and
port numbers so incoming reply packets can have their original values restored. The following
figure illustrates this.
Figure 8-7
How NAT Works
LTE CPE B2368
User Guide
8 Network Address Translation (NAT)
Issue 03 (2019-01-31)
Copyright © Huawei Technologies Co., Ltd.
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