Alcatel AST570, User Manual

Page: 193 / 300

ATM/DSL IP routing
AST570 poweron IP
routing table
configuration
14 Networking Services - IP
193 / 300
3EC 17766 AAAA TCZZA Ed. 04
Routing to ATM/DSL connections actually means:
Routing between the local (W)LAN and Classical Logical IP
subnets and vice/versa
Routing between the local (W)LAN and PPPoA and/or PPPoE
connections and vice/versa
Routing between the local (W)LAN and Routed Ethernet
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 (MER, PPPoE, PPPoA, 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. Consequently
it will forward the packet to the interface that may reach this
destination.
When the AST570 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 DHCP server of a Routed Ethernet connection
configured for DHCP.
Routes are added for the IP address negotiated between the
remote peer and an AST570 PPPoE and/or PPPoA entry
(configured for AlwaysOn).
If a CIP member is created and explicitly configured with an IP
address, routes are added for this IP address.