A patch for 6to4 support in Linux 2.4.0-test6. The patch is so simple that it should apply quite cleanly to most version (and works for sure with 2.4.0-test8). I also jotted down a few notes indicating how to 6to4 on Linux. While I was finding my way about the IPv6 code to create the patch, I also recorded a little guide to the Linux kernel's IPv6 implementation. New: this patch is now in 2.4.1, so you no longer need it, although you might like to patch 2.2 series kernels with it.
For further Linux IPv6 information, traverse to Peter Bieringer's definitive site.
You might like to grab my quick perl script which monitors the DHCP leases file and automatically updates BIND 9.0.1 (and maybe earlier) through dynamic DNS. Bind 9.0.1 supports the use of secure dynamic DNS updates, so you can build a system that is relatively secure.
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