Understanding the Three Dial-in Profile Types

97

Figure 53 Single User Dial-in from an Analog Modem

192.168.1.2

192.168.1.3

192.168.1.4

192.168.1.5

Server-side LAN

 

 

.2

 

 

 

.2

 

 

 

 

.168

 

 

 

 

2

 

 

 

 

9

 

 

 

 

1

 

 

192.168.254.1

192.168.254.1

 

 

 

Public telephone

 

192.

 

 

 

 

 

 

network

OfficeConnect

168.

2.

3

 

OfficeConnect

 

56K LAN Modem

 

 

 

Dual 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.

 

Client-side LAN

 

NAT then translates issued IP address

 

among attached workstations

Figure 54 Single User Dial-in from an Analog Router Using NAT

LAN Modem Site to Site The LAN Modem Site-to-Site Dial-in profile describes a scenario where a LAN Dial-in 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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3Com Dual 56K manual Single User Dial-in from an Analog Modem