Novell NETWARE 6-DOCUMENTATION Manual page 1874

IPX Filtering
IPX SAP Filters
14
Filter Configuration
A typical incoming routing information filter consists of the destination
network of the route and the interface through which advertisements of the
route are expected to be received.
Incoming routing information filters keep the filtering router from adding
certain routes to its routing table when it receives the information from its
neighbors. The filtering router cannot forward a packet to a filtered route even
if it receives a packet destined for it. In this way, incoming routing information
filters provide a higher level of security than that provided by outgoing routing
information filters.
IPX supports the following types of filters:
Outgoing SAP filters
Incoming SAP filters
Outgoing RIP filters
Incoming RIP filters
NetBIOS filters
For more information about IPX filtering, refer to
"IPX SAP Filters" on page 14
"IPX RIP Filters" on page 15
"IPX NetBIOS and Packet Forwarding Filters" on page 16
Servers and routers on an IPX network exchange information about the name,
type, and location of the various service providers on the internetwork by way
of SAP packets. This information is distributed to users through SAP packets.
By limiting the propagation of this information, SAP filters provide limited
security at the servers and reduce the bandwidth required by the SAP
exchanges.