Routing and WAN connections
372
11.4
IP masquerading
BAT54-Rail/F..
Release
7.54
06/08
U Configuration of IP masquerading
The use of IP masquerading is set individually for each route in the routing
table. The routing table can be reached as follows:
11.4.2 Inverse masquerading
(simple masquerading has the effect, that all IP addresses in the local net-
work are masked behind the IP address of the router. But when using simple
masquerading if a certain computer on the LAN is supposed to be available
for stations on the internet (e.g. FTP server) the IP address of the FTP server
is not visible either. A connection to this FTP server from the internet in not
possible.
To enable the access to such a server (’exposed host’) in the LAN, the IP ad-
dress of the FTP server must be entered with all services that are also sup-
posed to be available from outside the LAN. If a computer sends a packet
from the Internet to, for example, an FTP server on the LAN , from the point
of view of this computer the router appears to be the FTP server. The router
reads the IP address of the FTP server in the LAN from the entry in the ser-
vice table. The packet is forwarded to this computer. All packets that come
from the FTP server in the LAN (answers from the server) are hidden behind
the IP address of the router.
Configuration tool Run
LANconfig IP router
 Routing  Routing table
WEBconfig Expert Configuration
 Setup  IP-router
IP-routing-table
Terminal/Telnet
/setup/IP-router/IP-routing-table
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