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Routing and WAN connections 11.4 IP masquerading Source: 80.123.123.123 Target: 80.146.74.146, Port 21 Internet IP: 10.0.0.10 Ports Target IP 20 to 21 10.0.0.10 The only small difference is that: D Access to a service (port) in the intranet from outside must be defined in advance by specifying a port number. The destination port is specified with the intranet address of, for example, the FTP server, in a service table to achieve this. D When accessing the Internet from the LAN, on the other hand, the router itself makes the entry in the port and IP address information table. Note: The table concerned can hold up to 2048 entries, that is it allows 2048 simultaneous transmissions between the masked and the unmasked network. After a specified period of time, the router, however, assumes that the entry is no longer required and deletes it automatically from the table. U Configuration of the inverse masquerading The service table for setting inverse masquerading can be reached in LANconfig in the configuration area 'IP Router' on the tab 'Masq.'. BAT54-Rail/F.. Release 7.54 06/08 373
