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1 Introduction
Chapter 1 Introduction
1.1 Dial Routing Interface
The Dial Routing interface is a virtual interface that distributes IP traffic via a pool of "Dial PPP" interfaces. A series of
connections is defined in the configuration of the said interface such as the Dial PPP interfaces pool name. Each pro-
file has an identifier (ID) which uniquely identifies this as well as a set of associated parameters (called number, user
and password). Each Dial PPP interface can be registered in the pool through configuration. On enabling the Dial
Routing facility, you need to introduce the pool name configured within the Dial Routing interface.
1.2 Static Routes ID
The static routes ID are static routes whose next hop is a Dial Routing interface with an extra parameter: the ID
(profile identifier). By default, these routes have cost 3 assigned.
1.3 Function
Through the combination of the static routes ID and the Dial Routing interface, you can make the router act as a Dial
PPP connections server. Supposing we have the following network:
In the connections server, you add as many routes ID as distinct BRANCHES networks that exist. In the example
case, supposing we add a route to the LAN network of each branch (A1, A2 .....An). If a device located in network S
needs to address branch X LAN (AX), the IP packets exit with source S with destination AX, will reach the connec-
tions server in the first hop. In the initial state, assuming that an alternative lower cost route to the said destination
network does not exist, the first IP packet uses the route ID. This packet will pass to the specified Dial Routing inter-
face in the next route hop together with the ID. The Dial Routing interface will check if the said ID is in use and in
contrary cases will search for a free PPP Dial interface among those that are registered. If one is found, this will re-
serve it, dynamically configured it with the ID profile parameters and will run over all the routes IDs whose next hop is
the Dial Routing interface and whose ID is the past ID and will add for each of these a static route dynamically cre-
ated with the same destination and mask, but with the next hop being the reserved Dial PPP interface and with cost
1. The rest of the IP packets will use the new static route. When the call is released due to release time without data
or due to another cause, this dynamically created static route will disappear.
2
Alcatel-Lucent Enterprise
Dial Routing
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