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Figure 31.   Specifying a Name in the VPN Server Field
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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.
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In the PPTP Destination Table, you can determine which destination
each tunnel is associated with.
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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.
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The tunneling applications supported on your PC might have limitations.
Limitations of the most popular platforms currently in use are described next.