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9 Data Services - Classical IP & IP Routing
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3EC 17766 AAAA TCZZA Ed. 01
9.3 Using CIP & IP Routing
Similar to classical LAN networking, IP Routing and CIP adhere to
the "alwaysĆon" concept. That is, no special actions (e.g. dialing)
must be undertaken prior to IP connectivity.
IP packets sourced by local PCs, arrive via the Ethernet segment in
the STWireless . The latter makes routing decisions based on the
destination IP address of the packet. If the packet ends up in the
CIP member, it will on its turn determine to which VC it has to
output the packet.
You can check IP connectivity from any PC on the local Ethernet
segment. Therefor, ping the IP address at the far end of the virtual
connection; e.g. for the example of subsection 9.2.7, this would
be 172.16.1.2, or thus
ping 172.16.1.2
.
The IP router in the STWireless forwards packets between the
Ethernet port and the Classical IP entity sitting on top of the
ADSL/ATM port. In turn, the CIP entity determines which VC it has
to output the packet to, prior to ATM encapsulation.
The figure below provides an overview of the STWireless
rearĆtoĆfront end Classical IP operation:
Virtual Channels
VPI/VCI:8/80
VPI/VCI:8/81
VPI/VCI:8/82
VPI/VCI:8/83
Virtual Channel Resolving,
ATM encapsulation
IP Routing
IP Packet
Ethernet
CIP
Member