3Com 3C888 User Guide - Page 98

98 CHAPTER 8: CONFIGURING THE DUAL 56K LAN MODEM FOR DIAL-IN SUPPORT This is because the called LAN Modem acts as the DNS server for workstations attached to the calling LAN Modem. An example of a LAN Modem Site-to-Site setup is shown in Figure 55. 192.168.1.2 The called LAN Modem acts as DNS server to perform workstation name-to-IP address resolution for this call 192.168.2.2 192.168.1.3 192.168.1.4 192.168.1.5 Message MODEM 1 MODEM 2 AA CD RD SD OH AA CD RD SD OH Alert Power LAN Status TX COLL 1 2 3 4 OfficeConnect Dual 56k LAN Modem 192.168.1.1 Site A LAN Modem 192.168.1.1 192.168.1.1 Public telephone network Message MODEM 1 MODEM 2 AA CD RD SD OH AA CD RD SD OH Alert Power LAN Status TX COLL 1 2 3 4 OfficeConnect Dual 56k LAN Modem 192.168.2.1 Site B LAN Modem The called LAN Modem issues its own IP address as WAN IP address for this call. 192.168.2.3 192.168.2.4 192.168.2.5 Figure 55 LAN Modem Site-to-Site Dial-in Profile Type Choose LAN Modem Site-to-Site when your dial-in user will access a LAN Modem from another LAN Modem, where LAN resources are accessible on both ends of the connection. Advanced Dial-in The Advanced Dial-in profile applies to a network scenario in which a router other than a LAN Modem will be dialing into the Dual 56K LAN Modem. Advanced Dial-in assumes that both the Dual 56K LAN Modem and the other router have been manually configured for static IP addressing, and each employs a unique range of addresses, as shown in Figure 56. 192.168.1.2 192.168.1.3 192.168.1.4 192.168.1.5 Message MODEM 1 MODEM 2 AA CD RD SD OH AA CD RD SD OH Alert Power LAN Status TX COLL 1 2 3 4 OfficeConnect Dual 56k LAN Modem 192.168.1.1 OfficeConnect Dual 56K LAN Modem Public telephone network 1 3 2 4 TX RX LK CO 100.101.102.1 Analog router (other than LAN Modem) 100.101.102.2 100.101.102.3 100.101.102.4 100.101.102.5 Figure 56 Advanced Dial-in Profile Type Choose Advanced Dial-in if your LAN is using static IP addressing, or your dial-in user will be accessing a LAN Modem from a router other than a LAN Modem. Note that the Advance Dial-in is the most complex dial-in scenario and may require the assistance of your MIS administrator. Refer to "Creating a Private Network Service Provider Profile", which includes suggestions for configuring the Advanced dial-in parameters, for more information. Once you have chosen a dial-in scenario that best fits your dial-in criteria, you are ready to configure the server-side LAN Modem for dial-in access. Refer to "Part I. Configuring the Server-side Dual 56K LAN Modem for Dial-in Support" or "Creating a Private Network Service Provider Profile" to manually create or further define dial-in users.