Re: failed to set IPv6 default route

[Bjørn Mork <bjorn mork no>]

Dan Williams <dcbw redhat com> writes:
> On Mon, 2012-09-24 at 08:05 -0400, Gene Czarcinski wrote:
>
>>      ip  -6  route  add  default  via <fill_IPv6_address_of_'router'>  
>> dev  eth0
>
> So that's essentially what NM is trying to do, actually, but NM is
> trying to do it with netlink (which is what /sbin/ip uses too actually)
> but apparently the netlink options we're adding aren't quite correct
> here.  They unfortunately change periodically when kernel changes
> happen.  -7 appears to be NLE_INVAL, which would indicate the kernel
> doesn't think the route we gave it is valid.  We'd have to dig a bit
> further down to figure out what that error actually is.
>
> Last time I had to do this, I had to rebuild /sbin/ip and make it print
> out the exact netlink packet it was sending to the kernel.  Then I had
> NM print out its packet and compared the two.  If only there was an
> easier way...

strace -f -s 1024 ip route add ...?  Or use libnl?
http://www.infradead.org/~tgr/libnl/

But I don't think the kernel APIs should change, so if that is really
the problem then we should fix it.


Bjørn