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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 M5122
LAN/VBRIDGE IP address depending on the configuration. PPP
packets within PPTP are mapped to the configured VCC. M5122 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 M5122 IP address in PC’s PPTP
client Connect To window (see Figure 1-1).
D Chooses the VCC number using N:name, where name is the
VCCx description. N:name is entered after the M5122 IP address.
Figure 1-1 Choosing the VCC2 for tunneling example
4.5 Payload encapsulations
The Ethernet frames are encapsulated in the ATM link by using RFC
2684 LLC/SNAP encapsulation.