88 | Chapter 4 - AppleTalk Routing & Bridging |
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NBP Filtering
NBP Filtering Configuration Dialog Box
ϖNote: 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.
ϖNote: 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.
