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CHAPTER 4
Network Setup Protocol Structures and Data Types
152 Protocol Structures
fTSDUSize The maximum amount of data that packets of this protocol
can carry. Must be 586, which is the basic AppleTalk
datagram size.
fLoadType Whether AppleTalk is active. See discussion below for
possible values.
fNode Most recently acquired node number or the fixed node
number to use.
fNetwork Most recently acquired network number or the fixed
network number.
fRTMPRequestLimit Must be 3. This field is ignored by current versions of Open
Transport.
fRTMPRequestInterval
The request interval in milliseconds. This field must be 200.
This field is ignored by current versions of Open Transport.
fAddressGenLimit Address generation limit. The default is 250.
fBRCAgingInterval The Best Routing Cache (BRC) aging interval in
milliseconds. This field must be 4000. This field is ignored
by current versions of Open Transport.
fRTMPAgingInterval The Router Table Maintenance Protocol (RTMP) aging
interval in milliseconds. This field must be 5000. This field
is ignored by current versions of Open Transport.
fMaxAddrTries The maximum number of retries that OT makes when
trying to acquire an address. The default is 4096.
fDefaultChecksum When set to TRUE, a checksum is performed on the DDP
packet. When set to FALSE, no checksum is performed. The
default is FALSE.
fIsFixedNode Set to TRUE when fixed node and network numbers are
being used. The default value is FALSE.
fMyZone The most recently acquired zone.
For a detailed description of DDP, see Inside Macintosh: Networking with Open
Transport and Inside AppleTalk, Second edition.
The value of the fLoadType field controls whether AppleTalk is active. The
original definition of this field was as an inactivity timeout (in minutes), similar
to the inactivity timeout implemented for TCP/IP in current versions of Open
Transport.
Before Open Transport 1.0 was released, it was realized that loading and
unloading AppleTalk on demand was not possible, so the fLoadType field was