Specifications

Filters and Rules
AVM Access Server – 5 AVM Access Server Concepts and Functional Principles 59
Because the filter rules are grouped in several instances, they provide
very flexible and extensive control. The packet filtering performed by
the AVM Access Server is one way of setting up what is called a firewall,
a protective barrier around your network.
The individual filter instances in the AVM Access Server perform the fol-
lowing tasks:
Destination-specific input filters
Inspection of packets arriving from one of the AVM Access
Server’s ISDN or ADSL connections, or from a LAN adapter.
Destination-specific output filters
Inspection of packets leaving the AVM Access Server for
transmission over ISDN or ADSL to a remote user or network, or
through a LAN adapter.
Global input filter
Inspection of packets arriving in the AVM Access Server through
any interface (LAN, ISDN, GSM, ADSL or VPN).
Global output filter
Inspection of packets about to leave the AVM Access Server
through any interface (LAN, ISDN, GSM, ADSL or VPN ).
Forwarding filter
Inspection of all packets that enter the AVM Access Server from
any network for forwarding to their ultimate destination in a
different network. These may include packets from the LAN
addressed to an ISDN or VPN remote network, for example, or
from one remote network to another.
For a complete description with examples of the various filter instanc-
es, see page 62.
Filters and Rules
Filters are made up of the following components:
An ordered sequence of rules.
A default action which is performed on all packets not treated by
any rule in the filter.