Technical Reference; Nat Definitions - Huawei B222s User Manual

Chapter 10 Network Address Translation (NAT)
The following table describes the fields in this screen.
Table 37 Network Setting > NAT > Sessions
LABEL
MAX NAT Session
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10.5 Technical Reference

This section provides some technical background information about the topics covered in this
chapter.

10.5.1 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 38 NAT Definitions
ITEM
Inside
Outside
Local
Global
NAT never changes the IP address (either local or global) of an outside host.
100
DESCRIPTION
Use this field to set a common limit to the number of concurrent NAT sessions
each client computer can have.
If only a few clients use peer to peer applications, you can raise this number to
improve their performance. With heavy peer to peer application use, lower this
number to ensure no single client uses too many of the available NAT sessions.
Click Apply to save your changes.
Click Cancel to restore your previously saved settings.
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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