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over AAL5 encapsulation. Thus, each local PPTP tunnel requires an
equivalent ATM VCC assigned to it restricting the total number of
local PPTP hosts to 8.
Local tunneling is used when there is a need to have one or more
computers connected independently to different networks. For
example, in remote work application, the rest of the family may be
using the common ISP services and one or two family members need to
gain access to their corporate networks. With local tunneling, these
remote workers may be connected to a different network than the rest
of the users.
Local tunneling is activated using the PPTP client running, for
example, in Windows The destination IP address must be MW1122
LAN/WLAN/VBRIDGE IP address depending on the configuration.
PPP packets within PPTP are mapped to the configured VCC.
MW1122 has three different ways to choose the ATM VCC that will be
used for tunneling:
D
Automatic, chooses the first free VCC
D
Chooses the VCC number using C:number, where number is from
1 to 8. C:number is typed after the MW1122 IP address in PC's
PPTP client Connect To window (see Figure 2-5).
D
Chooses the VCC number using N:name, where name is the
VCCx description. N:name is fed after the MW1122 IP address.
Figure 2-5
C33902001SE_00
Choosing the VCC2 for tunneling example
E Copyright Nokia Networks Oy
Applications and features
2-11
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