FC3 comes with ipv6 on by default, at least /sbin/lsmod shows ipv6 running. But how can you check if it actually works and is being used.
It doesn't work ;-)
You get link local addresses. Which are preatty much useless for most of the things. The only theoretical use I could think of so far is attacking Linux based firewalls from compromised DMZ hosts. And that's about it.
Furthermore where can you 'stop' and 'start' it and how. (Not disable it, I know that you can do that via /etc/modprobe.conf).
You can't stop and start it. Once the module is loaded, it is (practically) impossible to unload it. Note that it isn't called from anywhere explicitly. As soon as an application shows the interest in IPv6, the ipv6 module gets automatically loaded, and then you are stuck with it. This usually happens eraly during boot process, and that is the reason you see ipv6 module always loaded.
IMHO, it was bad idea to enable automatic loading of that module for everybody. Vast majority of people have no use for IPv6, IPv6 on Linux is still not mature, stable and fully working (just look at all the bug reports, especially for 2.6.9 kernel that has really broken IPv6), and those who really need it could easilly enable it in either modprobe.conf or using config files in network-scripts directory.
-- Aleksandar Milivojevic <amilivojevic@xxxxxx> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7
