Technical Reference; Nat Definitions; What Nat Does - Huawei B2368 User Manual
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LTE CPE B2368
User Guide
Figure 8-6 Network Setting > NAT > ALG
8.6 Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.6.1 NAT Definitions
Inside/outside denotes where a host is located relative to the LTE Device, for example, the
computers of your subscribers are the inside hosts, while the web servers on the Internet are
the outside hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for
example, the local address refers to the IP address of a host when the packet is in the local
network, while the global address refers to the IP address of the host when the same packet is
traveling in the WAN side.
Note that inside/outside refers to the location of a host, while global/local refers to the IP
address of a host used in a packet. Thus, an inside local address (ILA) is the IP address of an
inside host in a packet when the packet is still in the local network, while an inside global
address (IGA) is the IP address of the same inside host when the packet is on the WAN side.
The following table summarizes this information.
Table 8-5 NAT Definitions
ITEM
Inside
Outside
Local
Global
NAT never changes the IP address (either local or global) of an outside host.
8.6.2 What NAT Does
In the simplest form, NAT changes the source IP address in a packet received from a
subscriber (the inside local address) to another (the inside global address) before forwarding
the packet to the WAN side. When the response comes back, NAT translates the destination
Issue 03 (2019-01-31)
Description
This refers to the host on the LAN.
This refers to the host on the WAN.
This refers to the packet address (source or destination) as the packet travels
on the LAN.
This refers to the packet address (source or destination) as the packet travels
on the WAN.
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8 Network Address Translation (NAT)
75
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