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Description of Functions
3-12
Depending on the modem type you are using (analog or ISDN) and
depending on the quality of the telephone line, this process may
take up to 60 seconds. During this time, some applications trigger
a timeout and will treat your query to the Internet as failed.
It may therefore be necessary to adapt the timeout times of your
programs.
The MODEM status LED is lit in green once the connection is
established. After the PPP connection has been established, your query
will be processed. The modem connection will remain active for a
certain period which can be specified. Each computer in the Ethernet
may use this connection. The period you are connected extends
automatically with each query put to the Internet. If during this period no
data traffic takes place, the connection is cleared automatically.
The status LED "MODEM" is lit in red once the connection is
established or cancelled or interrupted.
The status LED "MODEM" is off if there is no PPP connection via the
internal modem.
Check whether there are services in your network which put
queries to the Internet automatically at cyclic intervals (e.g.
Netscape Mail)
Such queries may result in an undesired connection or prevent a
connection being cleared by creating external data traffic.
If necessary adapt your firewall settings accordingly (disabling of
the port number of the service in "PORTS NOT FORWARDED";
Section 4.3.1.12)!
3.3 Functioning of "Dial–In Server"
The Internet Access Router is configured as a dial-in server by default.
This means that the modem of the router may accept calls via the
telephone network. Thus, a direct PPP (long-distance data
transmission) connection may be established to the router.
When the router is called, the modem is requested to pick up. After
picking up, a PPP server becomes active on the router and checks the
authentication of the caller. Then the IP data set according to Section
4.3.1.15 is transmitted to the remote computer automatically.
If the connection is active, the MODEM status LED is lit in green.
Now you may communicate transparently with the router services (Web
server, SSH) or the services provided by the clients integrated into the
Ethernets.
NOTE
CAUTION