Re: debian lenny no ipv6 forward
On 2010-11-24 21:31 +0100, Bonno Bloksma wrote:
> I cannot get radvd to work out of the box because ipv6 forward is disabled
> -----<quote>---------------
> linbobo:/var/log# /etc/init.d/radvd start
> Starting radvd:
> * IPv6 forwarding seems to be disabled.
> * See /usr/share/doc/radvd/README.Debian
> * radvd will *not* be started.
> linbobo:/var/log#
> -----<quote>---------------
>
> However in sysctl.conf in sysctl.conf I have:
> -----<quote>---------------
> linbobo:~# grep ipv6 /etc/sysctl.conf
> net.ipv6.conf.all.forwarding=1
> #net.ipv6.conf.all.accept_redirects = 0
> #net.ipv6.conf.all.accept_source_route = 0
> linbobo:~#
> -----<quote>---------------
>
> And still...
> -----<quote>---------------
> linbobo:~# cat /proc/sys/net/ipv6/conf/all/forwarding
> 0
> -----<quote>---------------
>
> Even after several reboot with different firewall settings and other
> things it still does not work as it should. Nothing in dmesg or syslog
> about why the ipv6 forward is still off.
> Anyone any idea what I need to look into?
>
> What DOES work is starting it manualy:
> -----<quote>---------------
> linbobo:/var/log# echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
> linbobo:/var/log# /etc/init.d/radvd start
> Starting radvd: radvd.
> -----<quote>---------------
> After that I can do an ipconfig /renew on my Windows PC and get the
> proper ipv6 address and I can do a proper ipv6 ping to a ipv6 site.
>
> What could be the cause for the sysctl.conf line not to be properly
> executed? This is simply the default line which I have enabled.
The problem is that the ipv6 module is loaded too late, namely only
_after_ the procps init script tries to set the ipv6 parameters. See
http://bugs.debian.org/507788 for the gory details.
The workaround for that is to load the ipv6 module before the procps
init script runs, e.g. by adding it to /etc/modules:
# echo ipv6 >> /etc/modules
Note that Squeeze kernels have ipv6 built in, so in Debian 6.0 most
people will not be affected by this problem anymore.
Sven
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