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The modem can also operate in more advanced local networks that rely on a
BOOTP server for centralized IP configuration.
The modem contains a BOOTP client that issues BOOTP requests during the first
two minutes after power-up/reset. If a BOOTP server is present in the local
network, it replies, and the modem acquires its IP parameters automatically.
The modem is compliant with RFC 951 Bootstrap Protocol and supports option 1
(Subnet Mask) and option 3 (Default Gateway) of RFC 2132 DHCP Options and
BOOTP Vendor Extensions.
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The modem also supports logical multi-homing; the default IP
address, or the address you assigned yourself, remains usable even
if the modem acquires parameters via BOOTP.
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The modem supports tunneling at the user interface of a router. This advanced
configuration requires a few special settings in the modem and the PCs in the
network. An example configuration is shown in figure 34.
10.0.0.138
IP Network 10
Figure 34. Example of Advanced Network Configuration
You must specify the default route for the modem. In this example, the IP address
of the default router would be 10.0.0.140, which is the IP address of the Ethernet
interface of the router connected to the modem.
For each PC you must add a route to the internal routing table. This route must
point to the modem. For PCs equipped with the Windows 95 operating system, the
procedure follows.
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IP Router
Local PPTP tunnels
172.16.0.1
10.0.0.140
IP Network 172.16
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172.16.0.2
Ethernet LAN
172.16.0.3
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