Nokia manual M1112 Administrator Manual, Point-to-Point Tunneling Protocol PPTP

M1112 Administrator Manual

Rate adaptation is done in steps of 32 kbit/s. The ADSL interface of M1112 functions completely automatically and all configuration related to the ADSL connection is done at the access multiplexer in the operator’s premises. The network operator can set the data rates as a part of the network management functionality provided by Nokia

DSLAM.

2.2.7Point-to-Point Tunneling Protocol (PPTP)

When PPTP local tunneling is used, a local network client initialises a PPTP-tunneled PPP connection (VPN) to Nokia M1112. The modem terminates the tunnel and all data from that terminated local PPTP tunnel will be forwarded to an assigned ATM VCC by using PPP 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 M1112 LAN/VBRIDGE IP address depending on the configuration. PPP packets within PPTP are mapped to the configured VCC. M1112 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 M1112 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 M1112 IP address.

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