282
BinTec Communications AG
Security Mechanisms
7
7.2.7
NAT (Network Address Translation)
➤➤
NAT
is a simple-to-operate procedure that can be used for three purpos-
es:
■
Hiding the internal host addresses of a LAN by remapping to one or more
external addresses.
■
Controlling external to internal access. In the external direction, the router
forwards all
➤➤
data packets
(forward NAT) and connections from exter-
nal callers are only allowed if explicitly enabled.
■
Permanent monitoring of the connections via the router with indication of
the source and destination addresses and
➤➤
ports
. See your syslog
messages for this purpose!
The following figure illustrates the function of forward NAT:
Figure 7-2:
Forward NAT
NAT always refers to an interface.
X3200
’s LAN side is always referred to as
"internal", the WAN partner as "external".
B
IA
N
C
A
/B
R
IC
K
-X
M
ISDN
192.168.1.1
192.168.1.2
192.168.1.3
ISDN IP
16.0.0.30
LAN IP
192.168.1.254
Forward NAT
?
16.0.0.30
Your Local Area Network
Network of your
WAN Partner
internal
external
access only
after explicit
permission
X3200
Содержание X3200
Страница 4: ...4 BinTec Communications AG...
Страница 28: ...28 BinTec Communications AG Welcome 1...
Страница 255: ...X3200 User s Guide 255 IPX Settings 6 Enter Age Multiplier if applicable Confirm with OK Press SAVE...
Страница 258: ...258 BinTec Communications AG Advanced Configuration 6...
Страница 348: ...348 BinTec Communications AG Technical Data 10...
Страница 361: ...X3200 User s Guide 361 12 Niemals Scheuermittel alkalische Reinigungsmittel scharfe oder scheuernde Hilfsmittel benutzen...
Страница 369: ...X3200 User s Guide 369 12 BinTec Communications AG...
Страница 393: ...X3200 User s Guide 393 12...
Страница 394: ...394 BinTec Communications AG General Safety Precautions in 15 Different Languages 12...
Страница 412: ...412 BinTec Communications AG Glossary...
Страница 419: ...X3200 User s Guide 419 Index WINS 210 229 X X 31 TEI 182...