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Leopard Reference Library: Networking
Mac OS X supports the major networking protocols and services and provides APIs that software developers can use to access network configurations, drive networking devices, or modify the functionality of networking stacks. Hardware developers can use Mac OS X networking services to design networking devices that are compatible with Apple products.

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Network Kernel Extensions Programming Guide (HTML) (PDF)
Describes how to write a kernel extension for adding or modifying functionality of a networking stack (Mac OS X 10.4 and later).
Guides 2009-03-02
Network Device Driver Programming Guide (HTML) (PDF)
Background and task information about developing network drivers for Mac OS X.
Guides 2008-03-11
CCL Modem Scripting Guide (HTML) (PDF)
Guides 2007-06-28
Network Kernel Extensions (legacy) (HTML) (PDF)
Describes how to write a kernel extension for adding or modifying functionality of a networking stack (Mac OS X 10.3 and earlier).
Guides 2006-10-03
CCL Modem Scripting Release Notes (HTML)
Explains changes to modem CCLs for Mac OS X v10.5 and what to do to change existing and supersede older scripts.
Release Notes 2007-10-31
tcplognke (HTML) (DMG) (ZIP)
Demonstrates a TCP socket filter based on supported Kernel Programming Interfaces for Tiger
Sample Code 2006-11-27
enetlognke (HTML) (DMG) (ZIP)
Interface filter based on supported Kernel Programming Interfaces for Tiger.
Sample Code 2005-08-10
BSDLLCTest (HTML) (DMG) (ZIP)
Program sample demonstrates how to send and receive raw LLC Ethernet packets.
Sample Code 2003-06-12
GetHWEthernetAddr (HTML) (DMG) (ZIP)
Deprecated - Shows how to obtain the hardware Ethernet address of a machine.
Sample Code 2003-01-14
GetSetOptions (HTML) (DMG) (ZIP)
Demonstrates a variety of uses of Open Transport's option management routines.
Sample Code 2003-01-14
ListMania (HTML) (DMG) (ZIP)
Demonstrates a variety of techniques for using Open Transport's list utility routines.
Sample Code 2003-01-14
NoCopyReceives (HTML) (DMG) (ZIP)
Demonstrates using no-copy receives under Open Transport.
Sample Code 2003-01-14
Kernel Core Dumps (HTML)
TN2118: Explains how to gather and use remote kernel core dumps.
Technical Notes 2008-11-12
Uniquely Identifying a Macintosh Computer (HTML) (日本語 HTML)
TN1103: How to identify a specific Macintosh computer.
Technical Notes 2006-04-25
Open Transport STREAMS FAQ (HTML)
Deprecated - TN1117: Decribes writing STREAMS modules and drivers for use with Open Transport.
Technical Notes 1997-12-01
Generating a Non-Maskable Interrupt (NMI) (HTML) (日本語 HTML)
QA1264: Explains how to generate a non-maskable interrupt (NMI) on modern Macintosh systems.
Technical Q&As 2008-10-13
IODeviceTree and the I/O Registry (HTML) (日本語 HTML)
QA1120: Describes the IODeviceTree plane in the Mac OS X I/O Registry.
Technical Q&As 2008-09-18
Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
Technical Q&As 2008-06-03
The state of mDNSResponder (HTML)
QA1339: Explains how to obtain information regarding the internal state of mDNSResponder.
Technical Q&As 2006-10-03
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
Technical Q&As 2006-02-22
Mixing link-local IP addresses and routable IP addresses (HTML)
QA1357: Explains how to enable communication between devices with link-local addresses and devices with routable addresses.
Technical Q&As 2005-07-06
Discovering all advertised Bonjour service types (HTML)
QA1337: Explains how to discover all Bonjour service types being advertised on the local network.
Technical Q&As 2004-06-01
Installing an I/O Kit KEXT Without Rebooting (HTML)
QA1319: Describes the state of the art of installing I/O Kit kernel extensions (KEXTs) without requiring a restart.
Technical Q&As 2003-10-28
Power Management; Policy Maker vs. Power Controller (HTML) (日本語 HTML)
QA1121: Describes the differences between a Power Management Policy Maker and a Power Management Power Controller.
Technical Q&As 2002-02-13
IOKit Framework Headers (HTML) (日本語 HTML)
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
Technical Q&As 2002-01-15
The "chosen" node in the device tree (HTML)
HW88: Describes how to find the "chosen" node in the Open firmware device tree.
Technical Q&As 2000-09-05
When to use PCMCIA, PC Card, and CardBus (HTML)
HW77: Explains the differences between PCMCIA, PC Card, and CardBus.
Technical Q&As 1999-11-15
Are the Name Registry device tree nodes unique? (HTML)
Deprecated - HW64: Discusses whether Name Registry nodes copied from the Open Firmware device tree are unique.
Technical Q&As 1999-10-11
TCP/IP Option Sizes (HTML) (日本語 HTML)
NW62: Enumerates the TCP/IP options and their sizes for Open Transport.
Technical Q&As 1999-04-26
Difference between using Restart or Shut Down in the Finder's Special menu in Open Firmware (HTML) (日本語 HTML)
HW47: Explains the differences between using Restart or Shut Down on Open Firmware
Technical Q&As 1999-02-15
What are snag keys in Open Firmware? (HTML) (日本語 HTML)
HW35: Explains Open Firmware snag keys, including examples of their function.
Technical Q&As 1999-02-15
OTScheduleDeferredTask When Task Running (HTML) (日本語 HTML)
NW52: Describes what happens when you use OTScheduleDefferedTask to schedule a task that is running.
Technical Q&As 1997-10-13
Changing the TCP Window Size (HTML)
NW47: Describes how to change the TCP window size in Open Transport.
Technical Q&As 1997-03-14
T_DATA_REQ vs M_DATA TPI Message Blocks (HTML) (日本語 HTML)
NW42: Explains why OT passes data to a TPI module using M_DATA message blocks instead of M_PROTO+T_DATA_REQ.
Technical Q&As 1996-10-25