[Olsr-dev] Fwd: [PATCH net] ipv6: don't stop backtracking in fib6_lookup_1 if subtree does not match

Henning Rogge (spam-protected)
Wed Aug 14 09:05:20 CEST 2013

On Wed, Aug 14, 2013 at 9:00 AM, Ferry Huberts <(spam-protected)> wrote:
> The magic word for kernel patches is 'regression'.
> Prove that it worked in an earlier kernel but not in the current.
> That will _guarantee_ that the patch will be merged into the current
> kernel and into all stable releases.

The problem is that source-specific routing never worked right in
Linux since they added the CONFIG_IPV6_SUBTREES option. And before
this point it did not worked at all.

The question about "existing users" is a little bit crazy because how
can there be an existing user if no working implementation exists.

I agree that SmartGateway without tunnel and MPTCP are two very useful
candidates for the kernel option.

Building an option into OLSRv2 to allow source-specific default routes
should not be difficult, we just have to make sure that we handle the
case well if there are routers in the network without the capability
of source-specific routing.

Henning Rogge

We began as wanderers, and we are wanderers still. We have lingered
long enough on the shores of the cosmic ocean. We are ready at last to
set sail for the stars - Carl Sagan

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