[Olsr-dev] Removing default route after program termination

Sven-Ola Tuecke (spam-protected)
Thu Oct 11 11:58:24 CEST 2007

Ah - please allow some more sentences. To bring some enlightment to the DAA 
(Dumbest Admin Avail), I remember once I simply announced Inet via a couple 
of HNA entries (requires some binary math). Example: Your mesh uses 
10.x.x.x, then a rock solid default route annoucement is by these HNA 


Which will overwrite any default route you configure <ggg>

// Sven-Ola

""Sven-Ola Tuecke"" <(spam-protected)> schrieb im Newsbeitrag 
> Hi Mitar,
> this is the "I want my internet for me" case. Not possible without policy
> routing (which I dont know how to implement with BSD). *With* policy 
> routing
> it's easy - just have 2 routing tables (one for the OLSR-Public and one 
> for
> you).
> * Note: To ensure others have a useable default route, you cannot roll 
> your
> own but refuse to HNA. Only works, if you do not forward IP traffic 
> either.
> Which is useless until you are definitely an end point. These are your
> alternatives:
> a) Use other (OLSR-Announced) GW (default point to other mesh node)
> b) Offer GW to others (default points to your GW)
> c) Use policy routing to distinguish. Use Linux + RtTable and all is fine
> // Sven-Ola
> "Mitar" <(spam-protected)> schrieb im Newsbeitrag
> news:(spam-protected)
>> Hi!
>>> We can deciced by examing the HNA 0/0 situation. If the BSD announces 
>>> HNA
>>> 0/0 (either by manual config entry or by dyngw/dyngwplain, it's scenario
>>> 1).
>>> Otherwise 2).
>> Not really. What if I have Internet access but I do not want to
>> announce it to the mesh? The mesh itself has HNA announced but I also
>> do not want to use it (as I have my Internet access and I do not want
>> to put load on a mesh unnecessary). But I still want to be able to
>> access nodes and subnets in a mesh (administration, different services
>> provided and all other reasons) and I want to be accessible from the
>> mesh so I need OLSR.
>> I see two possibilities:
>> The hard way: We extend OLSR daemon with routing daemon on BSD which
>> properly (the BSD way) work with multiple default routes, simulating
>> the routing behavior with different metrics for default routes on
>> other OSes.
>> The easy way: We ignore that adding a new default route does not do
>> anything on BSD, but we take care that the route OLSR removes is
>> really a route it added (and not some other default route). This way
>> it at least does not break anything.
>> Or maybe some configuration switch which would enable user to specify
>> which HNA announcements should his/her OLSR daemon ignore (so you
>> could ignore also some other announced subnets and of course also
>> default route announcements).
>> Mitar
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