Compatible Systems 5.4 - Manual (Page 94)

88 Chapter 4 - AppleTalk Routing & Bridging
NBP Filtering
NBP Filtering Configuration Dialog Box
v Note: The filtering functions discussed here are much less flexible than
those discussed in the AppleTalk Filtering section of this manual. We suggest
you read that section before choosing to use the filters discussed here.
The NBP (Name Binding Protocol) Filtering Dialog Box is accessed by
clicking the “Filtering” button in any Ethernet or Bridge port’s AppleTalk
Configuration menu. NBP is a part of the AppleTalk protocols (both Phase 1
and Phase 2) which is used to discover the AppleTalk network number and
node address of a named device on a network segment.
When the AppleTalk Chooser is opened on a computer, it causes NBP
“lookup” packets for a specified device type in a selected AppleTalk zone to
be sent. AppleTalk routers usually forward these NBP lookups onto any phys-
ical segments which are seeded with the selected AppleTalk zone name, and
then forward any NBP replies back to the requesting computer.
NBP filters cause a router to selectively change the way it treats NBP lookup
packets and NBP replies.
v Note: These filter options can be used regardless of whether or not this
router is acting as a seed router.
Network Filters
Network filters are applied to the physical network segment connected to this
interface. You may choose none, one or both of these options, depending
upon how you wish to secure your network.