Understanding the Three Dial-in Profile Types 97
Figure 53 Single User Dial-in from an Analog Modem
Figure 54 Single User Dial-in from an Analog Router Using NAT
LAN Modem Site to Site
Dial-in
The LAN Modem Site-to-Site Dial-in profile describes a scenario where a LAN
Modems dials into another LAN Modem, where workstations on both sides of the
connection can access servers and resources on each LAN. Because each LAN
Modem resides on different subnets, the Site-to-Site scenario provides
bi-directional LAN-to-LAN connectivity.
When the Site-to-Site scenario is first configured via the Dial-in Wizard (refer to
“Creating a Dial-In User Profile Using the Dial-In Wizard” for information), the
client LAN Modem will automatically change its default IP address and restart. This
is to distinguish between each LAN Modem’s subnet address, which by default are
identical (192.168.1.x).
Choose this dial-in profile type if you are setting up a network between two or
more sites, using a LAN Modem at each site, and you want any device on any LAN
to be able to communicate directly with any other device on any other LAN
(“peer-to-peer” networking). Note that when you choose the LAN Modem
Site-to-Site Dial-in profile, you must perform both sets of configuration step
sequences—create a dial-in profile and create a service provider connection—on
each LAN Modem.
In a LAN Modem Site-to-Site setup, neither LAN Modem uses NAT for IP address
translation. This allows workstations from both LANs to “see” and therefore send
packets to workstations on the opposite LAN. In addition, users on either LAN can
refer to workstations on the opposite LAN by domain name, as well as IP address.
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2.168.2.2
192.168.2.3
Server-side LAN
Client-side LAN
OfficeConnect
Dual 56K LAN Modem
192.168.254.1
192.168.254.1
OfficeConnect
56K LAN Modem
Server-side LAN Modem issues
single IP address to
client-side LAN Modem
Client-side LAN Modem
calls into server-side LAN Modem
and receives IP address.
NAT then translates issued IP address
among attached workstations
Public telephone
network
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OfficeConnect Dual 56k LAN Modem
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LAN StatusMODEM 2MODEM 1
192.168.1.2
192.168.1.3
192.168.1.4
192.168.1.5
