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Red Hat ISDN config
3. Extended Configuration
3.1 Network
If your ISP doesn't use the normal network addresses (last byte of the
IP is 0) and broadcast addresses (last byte is 255), you must enter the
correct values here. You should get these information from your ISP.
3.2 Netmask
See 3.1 Network
3.3 Callback
With the callback mode "in" your computer connects to the indicated ISP
as soon as it gets a calling of the telephone number "dialin telephone
number". Some companies use this type of callback, in order to prevent
the abuse of the access at the firm expense, since in this case always
the account of the customer is loaded with the fees.
The callback mode "out" operates the other way around. Your computer
calls the receiving station, then waits however not for an acceptance of
the call, but hangs up immediately and waits for the recall. This mode
is used e.g. with some teleworkstations, with which the company takes
over the on-line costs of its tele workers.
Callback mode "off" deactivates the callback system.
3.4 Telefonnumber of caller
Unless 'Permitted Telefonnumbers' is deactivated, only these
calling numbers may trigger a callback.
3.5 Timeout for callback
Time in seconds until a callback is initiated.
3.6 Permitted Telefonnumbers
If this checkbutton is activated, only configured callers may
connect. Please make sure that this button is enabled if you
use rawip, unless you want to allow everybody to connect to
your computer without auhentification.
3.7 Idle timeout
If an online connection isn't used for a while, ISDN4Linux can terminate
the connection automatically. With the menu option "Inactivity timeout"
you can change the default value of 240 seconds. For interactive
connections such as telnet or ssh you should select a somewhat longer
timeout, since with dynamic IPs after terminating the ISDN connection
these programs can't continue to work, because your computer will
possibly get another IP.
3.8 Debug Messages
Sometimes it may occur that despite all attempts the creation of a
functional ISP configuration doesn't succeed. In this case activate the
debugging and restart the ISDN system. When you retry to connect to the
ISP there will appear more detailed messages in the file
/var/log/messages, which are sometimes very helpful to detect the error.
Please deactivate the debug mode when the configuration is finished,
otherwise the log file will grow very fast.
3.8 Packet sizes (MTU/MRU)
Sometimes the syncppp protocol can't come to terms about the size
of the TCP/IP packages. In this case you'll have to set the size here.
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