Alcatel Carrier Internetworking Solutions 1000 ADSL Number of PPP/PPTP Connections Supported

Figure 31. Specifying a Name in the VPN Server Field

Number of PPP/PPTP Connections Supported

Tunneling does not affect the local network; you may add as many workstations as the local network supports. However there is an upper limit to the number of simultaneous outbound connections.

Unlike bridging, a PPP/ATM channel cannot be shared by multiple users. Every local user establishing a tunnel requires an ATM channel on the network. Therefore, any user on the local network can create a tunnel as long as unused ATM channels are available.

By default, the modem supports eight PPP/ATM channels. If all PPP/ATM channels are in use and a user tries to create a new tunnel, the modem refuses the request and an error message appears on the screen.

Note:

In the PPTP Destination Table, you can determine which destination each tunnel is associated with.

LAN Protocols Supported

TCP/IP is used to establish PPTP tunnels between local workstations and the modem. The data transported end-to-end may be TCP/IP, IPX/SPX, or NetBEUI. The limitations are not caused by the tunneling protocol or the ATM connection, but are a function of the PPTP client.

Currently, Windows 95, Windows 98, and Windows NT support three protocols in the tunnel. All three can be disabled individually.

Known Limitations

The tunneling applications supported on your PC might have limitations. Limitations of the most popular platforms currently in use are described next.