how can you check if ipv6 is actually 'working'?
Alexander Volovics
awol at home.nl
Tue Dec 14 15:44:46 UTC 2004
On Tue, Dec 14, 2004 at 09:27:57AM -0600, Aleksandar Milivojevic wrote:
> Alexander Volovics wrote:
> >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.
Thanks for the comprehensive reply. This ipv6 thingy had me really
puzzled. I started thinking about it because I noticed that when I
added an alias eth0:1 it had no inet6 adress (by the way can you also
tell me how to add an inet6 address to an alias).
I think I will just disable it for now.
Alexander
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