User's Manual

Chapter 10 Network Address Translation (NAT)
B222s User’s Guide
100
The following t able describes t he fields in t his screen.
10.5 Technical Reference
This sect ion provides som e t echnical background inform ation about t he t opics covered in t his
chapt er.
10.5.1 NAT Definitions
I nside/ out side denot es where a host is located relat ive t o t he LTE Device, for exam ple, t he
com puters of your subscribers are the inside hosts, while t he web servers on the I nt ernet are the
out side host s.
Global/ local denot es the I P address of a host in a packet as t he packet traverses a r out er, for
exam ple, t he local address refers t o the I P address of a host when the packet is in t he local
network, while t he global address refers t o t he I P address of t he host w hen t he sam e packet is
traveling in t he WAN side.
Note that inside/ out side refers t o t he locat ion of a host , while global/ local refers t o the I P address
of a host used in a packet . Thus, an inside local addr ess ( I LA) is the I P addr ess of an inside host in
a packet when t he packet is st ill in t he local network, while an inside global address ( I GA) is t he I P
address of the sam e inside host when t he packet is on t he WAN side. The following t able
sum m arizes t his inform ation.
NAT never changes the I P addr ess ( either local or global) of an out side host.
Table 37 Network Sett ing > NAT > Sessions
LABEL DESCRIPTION
MAX NAT Session
Use t his field t o set a com m on lim it t o t he num ber of concurrent NAT sessions
each client com put er can have.
I f only a few clients use peer t o peer applications, you can raise t his num ber t o
im prove t heir perform ance. With heavy peer to peer applicat ion use, lower t his
num ber t o ensure no single client uses t oo m any of t he available NAT sessions.
Apply Click Apply t o save your changes.
Cancel Click Ca nce l t o rest ore your previously saved set t ings.
Table 38 NAT Definit ions
ITEM DESCRIPTION
I nside This refers t o t he host on t he LAN.
Outside This refers t o t he host on t he WAN.
Local This refers t o the packet address ( source or dest inat ion) as t he packet travels on t he
LAN.
Global This refers to t he packet address ( source or dest ination) as the packet t ravels on t he
WAN.