This article is incomplete and was first written in July 2006 for the BeezNest technical website (http://glasnost.beeznest.org/articles/342).IPv6 is still not widely accepted and even less used. Many networked applications in Debian are enabling IPv6 support anyway, which result in a drop in performance and longer delays in day-to-day use. The effort to do the opposite (ie activating IPv6 throughout Debian) is located here: Debian IPv6 Project To disallow ipv6 kernel module autoloading, deactivate it in modutils [1] or module-init-tools in /etc/modprobe.d/aliases. To disable IPv6 name resolution in Firefox or other Gecko-based browsers, change the following option to true:
network.dns.disableIPv6
[1] deprecated for kernels 2.6+