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AppendixC Microsoft DialĆUp Networking
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3EC 17766 AAAA TCZZA Ed. 01
C.8 Platform Limitations of Windows DialĆUp Networking
Three limitations exist when using the Windows 9x OS:
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One Tunnel
Windows 9x only allows you to set up one tunnel at a time.
This implies that you cannot connect to both your ISP and your
corporate simultaneously from one PC.
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Tunneling within a Tunnel
Tunneling within a tunnel is not possible with Windows 9x,
due to its single tunnel limitation.
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Local Connectivity is Lost
After you set up a tunnel, communication with local LAN
devices may be lost. This is because Windows 9x adds a new
default gateway to its routing table. This new default gateway
points to the tunnel. As TCP/IP is designed to use only one
default gateway, connectivity through the original gateway will
be lost.
As soon as the tunnel is terminated, connectivity through the
original default gateway is again possible.
You can circumvent this problem by manually adding routes to
local destinations in the routing table (See section 11.4).
Windows NT does not share the first two limitations with Windows
9x:
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Multiple Tunnels
You can set up multiple tunnels; consequently you can connect
to multiple remote destinations simultaneously.
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Tunneling within a Tunnel
A tunnel within another tunnel is also possible, assuring better
endĆtoĆend security.