3Com Dual 56K User Manual page 101

Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support
5 If you are planning to use the Callback feature, use the Callback Prefix field to
enter the number required to reach an outside line, such as a 9. Otherwise, leave
this field blank.
6 In the LAN-to-LAN Site Number drop-down list box, designate the LAN Modem
site for dial-in access from other LAN Modems (which will dial into this LAN
Modem via the Site-to-Site scenario). Note that setting the site number may
change the IP address of the LAN Modem, as described below.
Choose None (the default) if you are configuring this LAN Modem to receive
dial-in calls from a Single User Dial-in client. This option will leave the LAN
Modem's IP address unchanged.
Advanced users may also want to choose None if the LAN Modem has already
been manually configured for static IP addressing.
Choose Site A if you are setting up a Site-to-Site network with two or more
LAN Modems, and this is the first LAN Modem that you are configuring (in
other words, this LAN Modem will place and/or receive calls to another LAN
Modem).
Choosing Site A will designate the LAN Modem's IP address to 192.168.1.1
(the LAN Modem's factory default). Note that if you have previously changed
the LAN Modem's IP address, choosing Site A will always revert the IP address
back to 192.168.1.1.
Choose Site B if you are setting up a site-to-site network with two or more LAN
Modems and you have already designated another LAN Modem as Site A.
Choosing Site B will cause this LAN Modem to change its IP address to
192.168.2.1. This is to differentiate between the two LAN Modem subnet
address, which by default are the same.
Choose Site C if you are setting up a site-to-site network with two or more LAN
Modems and you have already designated another LAN Modem as Site A
and/or Site B.
Choosing Site C will cause this LAN Modem to change its IP address to
192.168.3.1.
7 In the Auto Answer drop-down list box:, choose the number of rings (up to nine)
before each modem automatically answers an incoming call. To use the dial-in
features of the LAN Modem, Auto Answer must be enabled.
Auto Answer must be enabled to allow dial-in access to the LAN Modem. By
default, Auto Answer is disabled on both modems; in this case, all incoming calls
will be routed to any analog equipment connected to one of the PHONE ports.
8 In the PPP Authentication field, choose the type of PPP authentication you want
the LAN Modem to use when negotiating all dial-in calls. By default, PAP, CHAP
and MS-CHAP are enabled. This means that if the client-side device can perform
any of these three authentication types, the authentication process will be
successful. Note that at least one must be enabled.
9 Click Submit to save your changes.
If you choose Site B or Site C as the LAN to LAN Site Number, the LAN Modem will
re-initialize itself as it changes its IP address. The front panel LEDs flash during this
process, indicating that a reset is in progress.
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