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Operating modes and functions
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LANCOM Wireless L-11/IL-11
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62
EN
separates Internet and intranet, as if by a wall. Therefore, IP masquerading
is also called a “firewall function”.
For further information, see the 'IP routing: IP masquerading' section.
4.3 ISDN routing (LANCOM Wireless IL-11)
Data communications between two ISDN terminal devices takes place via
ISDN connections. These connections can be realized either as dial-up or
leased-line connections.
Initially the router modules only determine the remote site to which a data
packet is to be sent. The various parameters for all required ISDN connec-
tions must be arranged so that a given connection can be selected and estab-
lished as required. These parameters are stored in a variety of lists, the
interaction of which permits the correct connections.
A simplified example will clarify this process.
A data packet from a computer initially finds the path to the Internet through
the IP address of the recipient. The computer sends the packet with this
Provider A
Internet user's PC
Router
Data packet with
IP address
IP routing tab. IP address
name of remote site
ISDN list Remote station
subscriber number, communication layer
PPP list Remote site
user name and password
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