Re: ipv6 stateless autoconfiguration failing
George Manousakis a écrit :
>
>>> The router was configured with those values:
>>> ipv6 nd prefix default 180 120
>> What are these numbers ? Valid and preferred lifetimes ?
>
> Yes, valid = 180 sec , pref = 120 sec
[...]
> The sequence was that I removed those lines from my cisco router and
> rebooted the debian. When it was on, it got the global ipv6 correctly and
> till now (10 hours later) it's still there.
I guess that's because the router's default lifetime values apply now
and are much longer (as radvd default values), so after hours the prefix
is still valid. You can check it on the Debian box with "ip addr" which
shows the current valid and preferred lifetimes.
> But it's not the correct one
> anymore. The dynamic ip of me isp interconnection changed and so the /48
> subnet that I could use via 6to4 tunneling.
>
> Router still sends the RA's with the correct prefix but debian just ignores
> them!
I expected this. An RA is accepted at startup, then something happens
and further RA's are ignored.
> linux:~# cat /proc/sys/net/ipv6/conf/all/forwarding
> 1
>
> And then I changed the value to "0"
>
> The interface took immediately the new ipv6 address. Ok, it hasn't released
> the old one but at least it took the new one and was able to ping
> ipv6.google.com again.
>
> It's just odd because I remembered checking that value previously and find
> it "0".
When was "previously" ?
> I didn't change it because the box only has one ipv6 enabled
> interface so ipv6 forwarding is not an issue. I have no idea how the value
> was set to "1"
Maybe the routing daemon enabled IPv6 forwarding. In previous Debian
releases, the radvd startup script enabled it if it was disabled.
> and of course I had no idea that by setting this value to "1"
> autoconfiguration is disabled.
It is described in Documentation/networking/ip-sysctl.txt in the kernel
documentation.
> Thank you for your help!
You're welcome.
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