Operation Manual

Operating modes and functions
ELSA LANCOM Wireless
27
English
device name is accepted and verified as the name of the remote station. The PPP list can
be found in the
ELSA LANconfig in the 'Communication' configuration section on the
'Protocols' tab, or in the
/Setup/WAN-module/PPP List
menu.
No password? The PPP does indeed offer this special option: It is possible to request a
form of protection available specifically to this protocol, that is to say PAP (Password
Authentication Protocol) or CHAP (Challenge Handshake Authentication Protocol). This
is a form of protection which your device demands from the remote station.
Obviously you will not need to use the PAP or CHAP security procedures if you are using
the ELSA LANCOM to dial up an Internet service provider yourself, for example. You will
probably not be able to persuade the ISP to respond to a request for a password...
And where do a caller's name and password come from?
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In PPP connections, the name and password is sent to the remote station during the
call establishment, in the Dial-Up Networking connection window for example. The
device name, password and user name in the PPP list are used if the router
establishes the connection itself.
Checking the number
When a call is placed over an ISDN line, the caller's number is normally sent over the
D channel before a connection is even made (CLI – Calling Line Identifier).
Access to your own network is granted if the call number appears in the number list, or
the caller is called back if the callback option is activated. If the
ELSA LANCOM is set to
provide security using the telephone number, any calls from remote sites with unknown
numbers are denied access.
You can use call numbers as a security measure with any B channel protocol (layers).
Callback
The callback function offers a special form of access privilege: This requires the
'Callback' option to be activated in the name list for the desired caller and the call number
to be specified, if required.
You can use the settings in the name and number list and the selection of the protocol to
control the callback action of your router:
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The router can refuse to call back.
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It can call back using a preset call number.
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The caller can opt to specify the call number to be used for callback.
And all the while you can use the settings to dictate how the cost of the connection is to
be apportioned. The router accepts all unit charges, except for the unit required to send
the name, if call back 'With name' is set in the name list. Likewise, a unit is charged to