3Com Access Builder 7000 User Manual - page 25
Typical Applications
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9
IP Host on Another IP Network
Most organizations using TCP/IP protocols on their network, choose to
subnet remote sites or even to have them on different networks. This
requires that connections to remote sites are routed rather than bridged.
The advantage of routing over bridging is that calls to the remote site are
only made when data is specifically addressed to a remote network.
Bridging passes any data not known to be for the local network to the
remote network whether that is its destination or not.
Because the ISDN number can be associated with a remote network
rather than just a specific IP host, any data for the remote network can
generate an autocall and be routed through the AccessBuilder. If you
need to connect to IP hosts on several networks, you will need to use
routing to be able to communicate with the different hosts.
The example shown in
Figure 1-3
shows the Local Site connected to two
Remote sites over ISDN. All sites are connected using AccessBuilder units.
Figure 1-3
IP Routed Network