Sunday, January 17, 2010

Java IPv6 Weirdness

A couple of weeks ago I discovered that Java applets were broken on my Debian/sid desktop system. I finally found the solution but it is just plain weird.

Debian recently disabled IPv4 traffic over IPv6 connections. (I didn't even know such a thing was possible.) Under the new policy, if you need to do both types of traffic, you have to open separate connections for IPv4 and IPv6. Java apparently expects IPv4 traffic to work over IPv6 connections by default.

Because that last sentence is kind of scary, I'm going to assume that I don't really understand the problem.

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