Alcatel SPEED TOUCH PRO, User Manual

Page: 159 / 238

ATM/ADSL IP routing
STPro poweron IP
routing table
configuration
12 Networking Services - IP
159 / 238
3EC 17059 ABAA TCZZA Ed. 01
Routing to ATM/DSL connections actually means:
Routing between the local LAN and Classical Logical IP
subnets and vice/versa
Routing between the local LAN and PPP connections and
vice/versa.
Basically the IP router only cares about IP addresses, i.e. the
'Destination IP address' of any packet received on any of its
interfaces (PPP, CIP or Ethernet) is looked up in the IP routing table.
The lookup process will determine the best route that may lead to
the final destination of the packet. As a consequence it will
forward the packet to the interface that may reach this destination.
When the STPro is powered on, routes are automatically
configured in the routing table for the following possible IP
address entries in the 'IP address' table:
As soon as the Ethernet interface is up and running, routes
are added for each of the Ethernet interface IP addresses.
Routes are added for the IP address negotiated between the
remote peer and an STPro PPP & IP Routing entry (configured
for AlwaysOn).
If a CIP member is created and explicitly configured with an IP
address, routes are added for this IP address.