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Re: Getting Local IP Address in MacOS X

I am trying to find out how one would get the Local IP address of the
machine without using Open Transport.

I was using OTInetGetInterfaceInfo before to get the list of local IP
addresses.
This question is asked quite frequently on this list. In summary here are the replies:
- Mac OS X is a multihomed system. The computer may have many IP addresses (e.g. the Ethernet and AirPort card both be active and have IP addresses assigned to them).
- An interface may have multiple IP addresses assigned to it (aliases).
- An interface may have multiple IP addresses of different types assigned to it (e.g. IPv4 and IPv6).
- Quinn wrote an excellent Technote on this subject several years ago.
http://developer.apple.com/technotes/tn/tn1145.html
- getifaddrs() is my favorite way to get this information. It will return a list of all interfaces and the IP address assigned to them. If an interface has multiple IPs, it will be returned multiple times. There are other ways to get this information, which Quinn outlines in his technote.

Ryan McGann
email@hidden

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