[Olsr-dev] IPv6 Unique Local Addresses

Alexander Morlang (spam-protected)
Sat Nov 29 00:52:15 CET 2008

Hash: SHA1

John Hay schrieb:
> On Fri, Nov 28, 2008 at 07:30:56AM +0100, Henning Rogge wrote:
>> Am Thursday 27 November 2008 22:46:45 schrieb Alina Friedrichsen:
>>> Hi Henning!
>>>> I think the problem is that nobody in the OLSR.org team has lot's of
>>>> experience with IPv6... but it sounds like an important step for
>>>> autoconfiguration.
>>> In IPv6 you don't need a complex algorithm for address autoconfiguration,
>>> you can simply take your MAC address or a 64 bit random number. The
>>> probability for an address conflict is much less then a human error in
>>> manuall configuration.
>> In OLSRv1 (that is what we are using today) this would work, but ipv6 itself 
>> is a problem with OLSRv1 because the address fields are getting HUGE.
>> In OLSRv2 (which can use address compression for address blocks) even with 
>> "autoconfig" it would be better to use a real subnet so that you compress the 
>> blocks (common header/suffix-compression).
>> But the IPv6 autoconfig might be a good step to get a "permanent" adderss in 
>> an OLSRv2 IPv6 network. :)
> Something that should be considered is to use link-local addresses for
> the olsr packets. The ipv6 addresses that are exchanged should still
> be global or the unique local rfc4193 style. What I'm talking about is
> the address of the packet itself. There are two advantages that I can
> see.
> 1 - It is closer to how other routing daemons work.
> 2 - You automatically have the interface info because it is part of the
> link-local address.

i can agree on that, as olsrd now sets routes to neighbours to its ULA
or global addresse while it should set routes to the fe80:: link local

or is it just my misunderstanding?

> John

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