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Leopard Technical Q&As: Networking
Networking capabilities in Mac OS X include support for the major protocols and services. Developers can use the networking APIs to provide sophisticated LAN, WAN, Internet, and web capabilities in Carbon applications. These are accessible through sockets and Core Foundation, as well as through the higher-level Carbon APIs.

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Getting a Packet Trace (HTML) (日本語 HTML)
QA1176: Lists tools available for looking at the network packets on the wire.
Bonjour Printer Subtype for HTTP (HTML)
QA1555: Describes how printer vendors can register their bonjour service such that Safari can see them.
Don't forget to cancel your Bonjour resolve (HTML)
QA1297: Explains why it's important to cancel a Bonjour resolve operation.
Problems getting Bonjour TXT record information (HTML)
QA1389: Explains why you might have problems retrieving TXT record information from a CFNetServiceRef or NSNetService.
Resolves may return an IPv6 address in Panther (HTML)
QA1298: Explains why you get an IP address of when resolving a Bonjour service.
Bonjour enforces the TXT record format in Panther (HTML)
QA1306: Explains how mDNSResponder enforces the proper TXT record format in Panther.
Updating the TXT record of a Bonjour service (HTML)
QA1302: Explains how to update a Bonjour TXT record while running on either Jaguar or Panther.
Discovering all advertised Bonjour service types (HTML)
QA1337: Explains how to discover all Bonjour service types being advertised on the local network.
Bonjour enforces the service type format in Panther (HTML)
QA1198: Explains why registering a Bonjour service might fail on Panther.
Use the Computer Name when registering your Bonjour service (HTML)
QA1228: Explains why you should use the Computer Name when advertising a Bonjour service.
Downloading through a proxy server in Mac OS X (HTML)
QA1296: Explains when downloading through a proxy server will work, and when it will fail.
URL Access vs. CFNetwork (HTML)
QA1291: Explains when to choose URL Access or CFNetwork when downloading files from within your application.
Bonjour TXT record rate limiting in Panther (HTML)
QA1293: Explains how mDNSResponder implements TXT record rate limiting in Panther.
Bonjour and wake from sleep (HTML)
QA1290: Explains why applications that use Bonjour should stay registered and continue browsing on sleep.
PPPoE Server for Testing (HTML) (日本語 HTML)
QA1252: Describes how to configure Mac OS X as a PPPoE server for testing purposes.
Internet Connect Speed (HTML) (日本語 HTML)
QA1165: Describes how to get the modem connection speed from the System Configuration framework dynamic store.
Accessing HTTPS Proxy Settings (HTML) (日本語 HTML)
QA1234: Describes how to programatically access Secure Web Proxy information.
URL Access and the Missing Progress Dialog (HTML) (日本語 HTML)
Deprecated - QA1140: Explains a known bug in URL Access related to progress dialogs.
Setting request headers in URL Access (HTML) (日本語 HTML)
Deprecated - QA1073: Explains how to work around a bug in URL Access when setting request headers.
Getting the User and Computer Name (HTML)
QA1078: Describes how to get the user and computer name on Mac OS X.
How to use URL Access with proxy servers (HTML)
Deprecated - QA1074: Explains how to use URL Access with proxy servers.
Open Transport Libraries (HTML) (日本語 HTML)
NW18: Lists the Open Transport libraries and what to link with for PowerPC and 68K.
Raw IP and Open Transport 2.5.x (HTML)
Deprecated - NW63: Discusses Open Transport 2.5's change to the behavior of raw IP endpoints with IP_HDRINCL set.
Allocate and Disk Full Error (HTML) (日本語 HTML)
FL12: Discusses a problem with AFP volumes displaying incorrect free space, and returning disk full errors.
TCP/IP Option Sizes (HTML) (日本語 HTML)
NW62: Enumerates the TCP/IP options and their sizes for Open Transport.
fBroadCastAddr Always Zero (HTML) (日本語 HTML)
Deprecated - NW58: Explains why the fBroadcastAddr field may be zero after a call to OTInetGetInterfaceInfo and includes the workaround.
Determining if a Drive is a Network Volume (HTML) (日本語 HTML)
NW09: Shows how to determine if a volume is mounted over the network.
Numerous Small Packet Exchanges Resultin Poor TCP Performance (HTML) (日本語 HTML)
NW26: Explains why numerous small package exchanges result in poor TCP performance.
Receiving UDP Broadcasts (HTML) (日本語 HTML)
Deprecated - NW53: Explains why UDP endpoints may never receive UDP broadcast messages.
OTScheduleDeferredTask When Task Running (HTML) (日本語 HTML)
NW52: Describes what happens when you use OTScheduleDefferedTask to schedule a task that is running.
68K Open Transport Code on Power Macintoshes (HTML)
Deprecated - NW48: Explains why running Open Transport 68K code on a PowerPC may not always work.
Changing the TCP Window Size (HTML)
NW47: Describes how to change the TCP window size in Open Transport.
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.
Server Endpoint 'qlen' Limit (HTML) (日本語 HTML)
Deprecated - NW38: Tells how to determine the maximum 'qlen' value which limits the number of supported handoff endpoints.
Calling CloseOpenTransport When Writing an App (HTML) (日本語 HTML)
Deprecated - NW36: Identifies a bug in Open Transport 1.1 which means your application must CloseOpenTransport before quitting.
OTScheduleSystemTask Cleanup (HTML) (日本語 HTML)
Deprecated - NW37: States the proper way to clean up any pending system tasks scheduled with OTScheduleSystemTask.
Aborting a OTConnect in Progress (HTML)
Deprecated - NW29: Describes the proper way to abort OTConnect, and why after calling OTSndDisconnect you may receive "kOTOutStateErr".
Handing Off TCP Connections to a Different Port (HTML) (日本語 HTML)
NW25: Explains that a passive TCP connection cannot hand off the connection to a different port address.
PSetSelfSend in Classic AppleTalk vs. Open Transport AppleTalk (HTML) (日本語 HTML)
NW23: Describes the relationship between PSetSelfSend in Classic AppleTalk and Open Transport AppleTalk.
Synchronous TCP OTConnect Client Call Completes Before Server Responds (HTML) (日本語 HTML)
Deprecated - NW24: Explains why an OTConnect call will complete before the server responds.
TCP Application Acquires Different Port Address After Relaunch (HTML)
Deprecated - NW28: Explains why a server application acquires a different TCP/IP port address after restarting.
TCP Option Sizes (HTML)
Deprecated - NW27: Tells where to get more information on TCP Option sizes and setting TCP Options.
Error -3168 (kOTStateChangeErr) and Handoff Endpoints (HTML) (日本語 HTML)
Deprecated - NW22: Explains why a kOTStateChangeErr -3168 occurs when there is a handoff endpoint involved.
Closing the Connection: OpenTransport (HTML) (日本語 HTML)
Deprecated - NW20: Describes an orderly disconnect situation in Open Transport between two nodes.
Open Transport Error -3208: kEBADFErr (HTML) (日本語 HTML)
NW21: Explains why a call to OTSnd may result in a kEBADFErr -3208.