Newton’s Lore

It turns out that if your Java app is getting IPv6 addresses back from InetAddress.getLocalHost().getHostAddress() you can use flags to the Java VM to control this behaviour

-Djava.net.preferIPv4Stack=true

if you only want IPv4 addresses returned, or

-Djava.net.preferIPv6Stack=true

if you need to test your code against IPv6 addresses. These flags are only valid when passed to the JVM when it’s started up (ie they can’t be changed once the App’s running).

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This entry was posted on Thursday, July 26th, 2007 at 6:11 pm and is filed under Java on Mac OS X. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.