Dial Number Backup And Internet Access By Dcc - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
2) Configure NT server
Configure the modem connected to the PC to be in "auto answer mode", open
[Start/Programs/Accessories/Communications/Dialup Network], click [Set up new
connection] in the [Dialup Network] window, select the [Server type] page in the
established new connection, and perform the following operations:
First, open the [Network attributes/Services] page, add "remote access server" in it and
configure RAS attribute, click the <Add> button to install the modem, and set the
modem attribute to "Dial-out and dial-in". If the modem has been installed, click
<Configure>. Click the <Network> button on the right to set the network attributes of
RAS, including:
Select "TCP/IP" in both [Dial-out protocol] and [Server setting].
Click <Configure> on the right to configure an address assignment method for the
dial-in client. It can be either "Use DHCP" or "Use static address set".
Select [Allow any authentication] to configure "Encryption setting".
Then, select the menu bar [Management tools/Server management] to enable remote
accessing service.
Finally, select the menu bar [Management tools/Remote access management] to enter
the management interface, select [Users/Authorities] in it, and choose the user that can
implement remote access. Three callback attributes are available, including:
No callback
Set by the dial-in party: The ppp callback ntstring dial-number command should
be configured on the router if this method is selected.
Preset to number: If this method is selected, the dial-number set on the router will
be invalid and the NT system will dial the preset number when placing a return call.

1.4.7 Dial Number Backup and Internet Access by DCC

I. Network requirements
In PSTN, the dial number circular backup is fulfilled through configuring the dialer
route command at the dialing side. The access side provides the accessing service for
DCC via the asynchronous serial interface, and adopts the PAP authentication to
authenticate the validity of the dialing party. In ISDN, single dialer number and CHAP
authentication are adopted, and other configurations are similar to the PSTN side.
As shown in the following figure, RouterB and RouterD work as access server, RouterA
and RouterC at the dialing side accept the negotiated addresses assigned by the
remote ends. The address pool for allocation is in the range of 100.1.1.1 to 100.1.1.16.
RouterB and RouterD use the address 100.1.1.254, and obtain the dialer numbers
8810048 to 8810055 from the telecommunications service provider. ISDN dial number
is 8810148, which provides services for 16 network users.
3Com Corporation
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Chapter 1 DCC Configuration