Eicon Networks DIVA LAN ISDN manual Concurrent Internet and Intranet connections, Defining routes

Chapter Nine: Advanced Installations Concurrent Internet and Intranet connections 119

Concurrent Internet and Intranet connections

The DIVA LAN ISDN Modem can support both an Internet connection and an intranet connection to your corporate network. This section explains how to install and configure such a setup.

Selecting a connections protocol

One of the primary considerations is choice of connection protocol. If you want to have both connections active at the same time, you must assign PPP to each connection. The reason for this is that any MLPPP-related protocol reserves both ISDN channels for its exclusive use, even if they are not active. Therefore, the only way to share the two ISDN channels between two data connections is to use PPP for each.

Defining routes

If you have two active connections, it is important to define routes so that the DIVA LAN ISDN Modem can send data to the proper connection. In most cases, you will want to send certain specific traffic to your corporate network, and route all other traffic to the Internet.

For a complete discussion of routing issues, see “IP routes” on page 120.

Installation and configuration procedure

1.Use the Internet wizard, as described in Chapter 2, to define your Internet connection.

2.The Internet wizard will automatically add a default route to the routing table. The default route is defined as 0.0.0.0 with a mask of 0. This is a catch-all route. Any traffic which does not match any other route, will match the default route, and thus be sent to the Internet.

3.Next, create a connection to your corporate network as described in Chapter Eight.

•Choose PPP as the connection protocol.

•When you reach the routing table, you should configure it as outlined in the section “Multiple connections” on page 124.

4.You should now be able to use both connections.