[Olsr-users] HNA announce for the same network

[Markus Kittenberger]

On Thu, May 20, 2010 at 10:16 PM, Mitar <(spam-protected)> wrote:

> Hi!
>
> On Wed, May 19, 2010 at 2:20 PM, Henning Rogge
> <(spam-protected)> wrote:
> > If you don't use NAT on the two nodes and the target network has a
> correct
> > route back towards the OLSR nodes, it should work. TCP might be a little
> bit
> > "annoyed" when the route changes because delay and packet ordering might
> be
> > changed, but the connectivity should be there.
>
> But is that really useful?

hmm maybe i don`t get the point:

but if it`s not useful for you, simply do not announce this network on
multiple olsr routers ...


> Having a HNA on nodes connected to the
> subnet means that you are not running OLSR in the subnet. So then you
> probably have a static route

yes maybe, but see below (or #2)


> just to one of this nodes connected to
> the subnet (acting as a gateway). So if this nodes fails then having
> another node does not really help.
>
which is imho absolutely nothing olsrd has to think about!!

if there are multiple announcements, olsrd shall find the nearest gateway to
this network,
whether the announced network itself is configured intelligent itself #1, is
up to this networks admin,..

instead it would be better to think about adding better dynamic route
redistribution features to olsrd

>
> It would help for load-balancing but then if one node fails you would
> have just 50 % packet loss (if you have two nodes connected to the
> subnet).
>
> Or am I missing something? Any other use case?
>
imho there are surely many other use cases,..

even if u have static routing in this network it might still make not much
sense to route traffic around such a network, to reach the one and only hna
gateway into it

even if the return path will go the long way "around", it`s still a a
benefit to route at least one direction efficient,..

Markus

#1
maybe the "hna announced network" redistributing olsr outes internally with
ospf,..

than it will definitely benefit from multiple gateways (an ospf would detect
if one gateway (or the olsrd on it crahes)) and wil react,.

ospf might even use multiple gateways (to othe olsr mesh) for permanent load
balancing,..

#2 but u might even have a (quite untypical) nat setup, which enables u to
use the same gateway on the return path aswell,..

or something even more complex,.
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