Siemens CP 1515 Operations Instructions Page 203

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Configuration Using Web Based Management and the Command Line Interface
C79000-G8976-C184-07
203
ote
enu command is available only with the following variants:
)
6.5.7 NAT Menu Command
N
This m
SCALANCE W746-1PRO
SCALANCE W747-1RR
SCALANCE W78x (client mode only
What is NAT?
nslation (NAT), the IP address in a data packet is
placed by another. NAT is normally used on a gateway between a private LAN
al network with globally valid IP addresses. A local IP address of the
l LAN is changed to an external global IP address by a NAT device at the
To translate the internal into the global IP address, the NAT device maintains a
What is NA
is
n list of the NAT gateway and translated for the external
s.
its own external source IP address in
the header of these forwarded frames. Since the forwarded frames have the same
lobal source IP address, the NAT gateway assigns the frames to the clients using
nt port number.
With Network Address Tra
re
and an extern
interna
gateway.
translation list.
PT?
In Network Address Port Translation (NAPT) or Port Address Translation (PAT),
several internal source IP addresses are translated into the same external source
IP address. To identify the individual source nodes, the port of the source device
also stored in the translatio
addres
If several local clients send a query to the same external destination IP address
over the NAT gateway, the gateway enters
g
differe
Operating Instructions SCALANCE W78x
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